1 9 7 6 Fa l l M e e t i n g

T e c h n i c a l C o m m i t t e e D o c u m e n t a t i o n

TCD-76-F

• A Compilation of the Documented Action on Comments Received by the Technical Committees Whose Reports Have Been Published

Prior to Consideration at the NFPA Fall Meeting

The Netherland Hilton Hotel Cincinnati, Ohio

November 15-18, 1976

I Please Bring to the Fall Meeting 1

N F P ~

Copyright © 1976 All Rights Reserved

National Fire Protection Association 470 Atlantic Avenue, Boston, MA 02210

10M-9-76.FP.SM Printed in U.S.A.

501B, 501BM, 501C

Supplementary

Report of Committee on Mobile Homes and Recreational Vehicles

Correlating Committee on Mobile Homes and Recreational Vehicles

(All Members Serve iB Personal Capacity)

Lloyd W. Garner , C~azrman ( teorgla State Ftremcn'a Ahsoclatlon, [nc, 72(I Church Street, l)ecatllr, (~A 30030

Georfte H. 'Fryon,? Adm,ntsg~a&~e Secretary* National }"ire Protection A.~oClatton, 470 Atlantic Ave, B,~ton, r~lA I}2210

Delevan J. Arnold, Vebelv ( Olrli,nnv Russell R. Bahr , State of ( ahfornla, I)e

partrnent uf [fou~mg and ('omrnunltv I)e ~elopment ~('hazrmarL Se(tmnal f 'om inlttee on Mobile []onle~]

Artle O. Barker, hlaho Stare Electrt, al E~mrd

C. E. Blome, Amerlcan A~boclatlon of Re- tired Persons

Wal te r N. Burke , Veterans ~.dmnnst~atmn Wil l iam E. D e l l Department of Labor and

Industries, ~tate ~f ~tashmgton Edward J. Dwyer, E J l)~yer ('ompany H. Wil l iam Ewlg, Utica ~]llttlRI lngurance

t 'ompan3 r('halrman. ~eutn,na[ ('o[l~lnltlee on Be('reatlona[ \ chide Park~)

J ames G. Gross, Office nl Bmlthng Stan- dards and Codes Servlce~, ~'N'attonal I~Hreau of Standards, U S. Department uf Com- merce

Jo rdan l i e i m a n , Amenvan Socmty of Heat- i~g, Refngeratmg and Air C~ndlt;onmg Engmeers. Inc.

K e n n e t h C. Henke . Jr , . State of Iowa Office of Planmng and Programming National Conference of States on Bulhllng Codes and Standards

? N o n v o t i n g

Walter II. J o h n s o n , Natmnal I.I' (;a~ A~vocmtx,,n IChalrman, Sm'r.,nal Com- nnttee ,,[1 Ite~ reatlonal Vehn'le~)

l )uane E. Kepl lnger . I'ederal Hollslng tdmlnhiratloh, l t S I)vparrl.Pi]tol f[,jlzs

mg aml Cd,an D~ l , , vmen t Norlr~an Lat ter , It~ternatmnal A~nn of

plumbing de 5Ie,'hanlcal Officials W= J. S m t t h , [rnder~rtters Lal,,~ratorie~

| nc Phi l ip B. Wanroy , Kampground~ of

America Vincen t J. Wanzek , f leetwood Enterprises

Nonvo t ing Member s

Francis E. Greenteaf , Manufactured Hmt~- tng ln~tlt ute-~Vestern Regional Ol[ice ~Setretary, Se,'tlonal Comn ee on 3 o de H~me Parks~

l l enry Onlson, 7~fanufactured l]ollMag In- stitute fSecretarv, S~ttlonRl ('ommlt~ee on Mohde Homen/

Phi l ip N. Shrake , Iteereatlou Veht, le In- dustry Ahsocmtlon (Secretary, Sectmnal Committee on Recreational Vehicles and Sectional Comimttee on Recreational Vehicle Parks)

Sectional Committee on Mobile Homes

Russell R. Bahr , Chairman S~ate of Cahfnrm~, Dep~r~ment of Housing and C~mmumty Development

1807 13th Street, Sacramento, CA 95814

Hen ry Omson,~ Secretary .Manufactured Housmtg Institute

14650 Lee Road, ChantdIy, VA 22021

T. R. Arnold, T R Arnold & Assoclates Char les Ashford, Redman Mobde Homes,

inc. (rep. Manufactured Housmg in- stitute)

Artie O. Barker, Idaho ~tate El~,'trnal Board {rep National Elertncal Code C0m mlttee, IAEI I

Donald A. Barrow, Skyhne ('orp irep :qanufactdred Housing In~tltute~

R chard tl. Bast , l)ep 1 ~ S a~e ['he Marshal, State . f Ne~a,]a ,rev lgre Marshals As~n of N,~rth Amerlca~

I lerber t W. Behrend , Lake I'ore~t, IL (rep Amem,'an Socmt~ . f CIvd EnglnePr~

C. E. Blome, American A~oclatmn of Re tired Per.~ns

J o h n (;. Cerny, ('ern~ and I~cr .~-~O(lare% inc

J a n e K a t h r y n Conrad, Dea~er. CO ~r~p American ~Iot,llehome %~o,,tat]on and Mohde ftome l,lfet

Orville H. C u m m i n g s , Flornla Dept. of t t lgh~a) Safety and Mot . r Vehicles

Wil l iam E. Dell, State of Washington, Dept ol I.abor and Indu~trles

Edward J. D~yer , E ,1 Dwyer Company Irep Arnerl,'aa Society of Mechanical Engmeer~

Vernon I.. Eder, ~diInnl~tratlve B/lddlng CoHncd of lad;alia

C. ?',lorgan Edwards, Penn~lvama l)epart- ment uf C . m m u m t v Affmrs

Rona ld E. Evans, ll,,~,e~ Mohde H,zmes, In* rrep 3.1anofaltnred ~] otl~lll~ in- ~tttnte Suuthea~tern Ileglona[ O[h~e)

1t. Wil l iam Ewl~, ~['tlPgt Mutual Insurance ('onlpany /rep Alilefl,'al~ 3I tit illd In- ~uran,'e Alliance)

T o m s 2 _ ~ - - Cable, National Sannat~on I"mm-

Lloyd W. Garner , (*eorgm State I lremen's

J o h n R. Gore, Jr . , (leurgia State l'3re Marshal (rep Ftre Marshals Assn. of North A merlca)

Francis E. Greenleaf , ManufactHred Hunt- ing Institute-Western Reglonal OSiee

Hans R. Grigo, NattonM Safety (/el;ned Verse R. Groendal . 5hchtgan Consolidated

f;ms Co. (rep. American Gas Assomatmn) J a m e s G. Gross, National Bureau of

Standards, U.S Department of Commerce Jo rdan [ Ie lman , Ohvette, 510 (rep.

American Society of Heating, Refrigerating anti Air Conditioning I~nglneers)

K e n n e t h C. i l enke . Jr . , Natmnal Con- ference of States on [~uddlng Codes and Standards

Wal te r H. J o h n s o n , National LP-Gs.s As~ocJatlon

Aron Kllewer, Fleetwood Enterprises. Inc. /rep. Manufactured Housing Institute)

J o h n P. L a n g m e a d , Gas Apphance l~lanu- facturers A~soeiatu)n

N o r m a n La t t e r , International Association of Plumhln~ and Mechamcal Officials

J l y u n Nakaj l , Manufactured Flouslng In- stitute-Western Regional Office

Wil l iam T. Nebraska, Aetna fafe de Casualty (rep. American Insurance Al- hanee)

Char les V, Opdyke, MiOugan State I )epart meat of Labor

E. J. O r th , Jr . , Alabama Power Co. (rep. Electric Light and Power (;roupJ

L. E. Pa lmer , Union lnsulatme Company rrep Natlonat Electrical Manufacturers Assocmtmn)

Nell Peterson, Oregon State Department of Dommerce

Dr. Mary S. P icke t t , I ~ a State University ~rep. Illuminating Engineering Society)

J i m P r in ty , Phe Doleman Company, Inc. (rep Air Condltmmng and Refrlgeratlou Instttute~

Kenneth D. RhotDn, Gold Seal, Dtvlsion o~ ETL, Inc.

James H. Shelton, Arizona Department of IIealth (rep. Amerlcan Society of Saaltary Engm~rlng~

W. J. Sniith, Under~rlters Labnraterles Inc.

M. W. Smithman, Natlonal Assoetatmn of Home Bmlders

J. Herber t Wl t te , Gas Vent Inst i tute

][}on Belton, .Manufactured [iouslng In- stxtute (Alternate to Aron Kilm~er)

S. L. B l a c h m a n , American Gas Association (Alternate to Verse R. Groendal)

Ra lph A. Brewster, American Insurance Association /Alternate to X~ dham T. Nebraska)

Rex George Earlly, National Conference of States for Budding Codes and Standards (Alternate to Kenneth C. Henke, Jr )

Rober t J. Evans, Air Conditiomng and Refrigeration Inst i tute (Alternate to Jim Printy)

Earl A. Fe rguson Manufactured Housing Institute-Southeastern Regmnal Office (A - ternate to Ronald E. Evans)

J o h n Fleming , , National Safety Council (Alternate toHans R. Grign)

Howard L, Glasky, Manufactured Housmg Institute-Western Regmnal Office {Alter- nate to Jiyun Naka)l)

Nicholas A. LaCour te , Amerlcan Society of Heating, Refrlgeratmg and Air Con- dltmnin Engineers, Inc. fAhernate to Jordan ~Im man/

Nell MacLean, Internatlona~ Assoclatlon of Plumbmg and Mechanical Officials ~Alter- sate to Norman Latter)

W. D. Miller National Electrical Manu- facturers Assnemtlon (A ternate to L. E. Palmer)

J a m e s H. Ptelert , Natmnal Bure~u of Stand~ds (Alternate to James O. Gross)

J o h n Pltre, Manufactured Housing In- stitute-Western Regional Office (Alternate to recently res2gned member)

J a m e s Phill ips, Manufactured Housing In- sti tute (Alternate to Donald Barrow)

J a m e s L. R o n d e a u , Department of Labor and Industries, State of Washington (Alternate to William E. Dell)

Danie l W, Ta lbo t t , National Association of Home Builders (Alternate to M. W. Smith- man)

L, E. T o w n . r i d , M: nufactured Housing In- stitute (Alternate to Charles T. Ashfnrd)

Rene H. Yerke, Underwriters Laboratories Ine. (Alternate to W. J. Srmth)

M i c h a e l Z t e m a n , Manufactured Housing Instltute-Western Regional Office (Alter- nate to Francis E. Greenleaf)

CharleB E. Zlmmerman. National Elec- trlcal Manufacturers Association (Alternate to L. E. Palmer)

Nonvo t ing M e m b e r s

W a l t e r N. Burke , Veterans Administratlon Wllford L S u m m e r s , National Fire Pro- Eric Ken t , Canadian Standards Assomatlon tection Association D u a n e E. Kepl in er, Federal Housing Ad- George H. T ryon , National Fire Proteetmn

ministration, U.~. Dept of Housing & Association Urban Development Brian Weir, Cauadian Standards Ae~oeiation

tNonvotmg

134

501B, 501BM, 501C

The Manual on Mobile Home Heating and Cooling Load Calculations for Determining Compliance with the Energy Conservation Criteria of the Standard for Mobile Homes (Proposed NFPA No. 501BM-1976; ANSI AI19.1.I- 1976) was prepared by the Energy Conservation Task Force for Letter Ballot by the Sectional Committee on Mobile Homes. The principal members of the Task Force were:

C. E. Blome Chairman National Association of Retired Persons

Jim Printy, Vice-Chairman Air Conditioning and Refrigeration Institute

The Coleman Company, Inc.

Steve Schopbach, Secretary Society of the Plastics Industry

Monsanto Company

T. R. Arnold, T. R. Arnold & Associates Charles Ashford, Manufactured Housing Institute,

Redman Mobile Homes, Inc. Courtney Bythewood, Georgia Power Company A. B. Chadwick, Intertherm Inc. Earl Ferguson, Manufactured Housing Institute-

Southeastern Regional Office B. A. Graham, Johns-Manville Corp. Jordan Heiman, American Society of Heating,

Refrigerating and Air Conditioning Engineers, Inc. J. L. Heldenbrand, Office of Energy Conservation,

National Bureau of Standards Nick Koskolos, Intertherm Dave Lovich, Owens-Corning Fiberglas L. A. Lundeen, Jr., Johns-Manville Sales Corp. Dan B. McVickar, Lear Siegler Inc., Home-Siegler

Division

Melvin E. Miller, Duo-Therm, Division of Motor Wheel Corp.

Frank W. Osborn, Technical Service Associates E. J. Orth, Edison Electric Institute, Alabama

Power Co. Brad Peavy, Center for Building Technology,

National Bureau of Standards Theodore P. Pritsker, Associated Dallas Laboratories William C. Roe, Skyline Corporation W. J. Smith, Underwriters Laboratories, Inc. Jerry Tietsma, Dow Chemical Company Ray Tucker, Guerdon Industries J. Herbert Witte, Gas Vent Institute Burton L. Weller, National Oil Fuel Institute, Inc.

Sectional Committee o n Recreational Vehicles

Walte r H. J o h n s o n , Chairman Vice President, Technological Services, National LP-Gas ]LsSOClatlon

79 West M o n r ~ Street, Chicago, IL 60@03

P h i l i p N. Shrake,~ Secretary Recreation Vehicle Industry Association

14650 Lee Road, Chantllly. VA 22021

Delevan J. Arnold, Veselv Company (rap. Recreatlon Vehlcle Induslry Assoemtlon)

Thomas R. Arnold. T..g. Arnold & As- sociates. Inc.

Rum~ell R. Bahr , Callforma Dept. of Hous- ing and Commumty Dexelopment

Art le O. Barker , Idah~J State Blectneal Board (rep. National Ele,'trical Code Com- mittee, I n t e r n a t m ~ l Am,ocmtmn of Elec- t r i a l Inspectors)

R i c h a r d H. Bast , Del,uty SLate Fire Marshal, State of Neeada {rep FI~ Marshals Association of North America)

Doug las R. Re t t s , Fleetwood Enterprises, Inc (rep. Manufactured Hoa~lng In- sti tute Western Regmna] Office)

F r a n c i s Bowsman , Frui~ Belt Electrical Cooperative Irep. National Lural Electric Cooperative Associatinn/

J a n e K a t h r y n Conrad , Denver, CO (rap. American Mobllehome A.,soclatlon,,Mobde Home Life)

Edward J. Dwyer, E. J. Dwyer Company (rap. American Soelet~ of Meehamcal Engineers)

H. Wi l l i am Ewig, Utica Mutual Insurance Company (rep. Amert, an Mutual In suranee Alliance}

J o h n F l e m i n g , National Safely Council T o m S. Gable . Nataonal Saturation F o ~ -

darien

Lloyd W. Garne r , Georgia State Flremen's Association, Inc.

J o h n R. Gore, Jr . , Georgia State Fire Marshal (rap. Fire Marshals Amn. of North America)

Verne R. G r ~ n d a l , Maehtgan Consobdated Gas Co. (rep. Amerxean Gas A~ociatlon)

J o r d a n H e l m a n , Ohvette, MO }rep. American Socmty oi Heating, Refrigerating and Air Conchtioning Engineers}

Freder i ck F. Hetsel, Minnesota State Dept. of H ~ l t h (~p. Conference of State Samtary Engineers)

J o h n P. L a n g m e a d . Gas Appliance Manu- facturers Amoctation

N o r m a n La t t e r . International Assoeiataon of Plumbing and Mechamcal Officlals

Will iam T. Nebraska, Aetna Life & Casualty (rap. American Insurance As- socmtlonl

M a t i n Nerem, Winnebago Industries, Inc. (rap. Recreation Vehicle industry Associ- ation)

Char les V. Opdyke , Department of Labor, State of Michigan

L. E. Pa lmer , Unmn Insulating Company (rep. National Electrtcal Manufacture~ A~omatmn)

Dr. Mary S. P icke t t , Iowa State Umverslty (rcp. iUu~na t Ing Engln~r lng Society)

J o h n Pitre, Los Angel~, CA flap. Manu J a m e s H. She l ton , Anzona Department of factored Housing lnStltute-V~'e, stern Re- Health (rep Ata*erlcan Society of Samtary gtonal Office) Engineering)

Rona ld B. Singer , Southern California J i m Pr in ty , The Coleman Company, Inc. Edison Company (reD. Electric Light &

(rap Air Condlttomng and Refrigeration Power Group) Institute}

W:nJ*lc S m i t h . Underwriters Laboratories Winfield C. Rhoads , Allstate Insurance

C o m p l y Fred D. Tidwell, Natmnal Park Service, U.S. Department of the Interior

K e n n e t h D. R h o t o n , Gold S~I, DlVlSlOn of J. Herber t Wi t te , American Ass~iatlon of ETL Retlred Persona and Gas Vent Instltute

~Nonvoting

Al te rna te s

S. L. Blachman. American Gas Assoclatmn (Alternate to Verne R. Groendal)

Ralph A. Brewster, American I~uranee As- soelatlon (Alternate to %hilmm T. Ne br~ka)

Robert J. Evans, Alr Conditlonmg add Re fngerahon Insti tute (Alternate tn Jim Prmty)

F r a n c i s E. Greenleaf , Manufactured Hods in ag Institute-Western Regional Office (Alte~te to John Pxtre)

H a n s R. Grlgo, National Safety Councd (Alternate to John Flen~ng)

E u g e n e L. Kllbourn , Recreation Vehicle Industry Assocmtlon (Alternate to Delevan J. ArnoLd)

Nicholas A. LaCour t e , Amerl~n Society of Heating, Refrigerating and Air Con- d~ttol~n Engineers. Inc. (Alternate to Jordan ~eiman)

Nell MacLean, Inter~ttonal Assoclatlon of Plumbing and Meehamcal Officmls {Alter- hate to Norman Latter)

W. P. Marsha l l . Recreation Vehicle In- dustry A~octatloa (Alternate to Marvin Nemm)

W. D. Miller, National Electrical Manu- facturers Association (Alternate to L. E. Palmer)

L. W. Mo~es, a c c r e t i o n Vehicle Industry A~oclatlon (Alternate t~ Phlhp N. Shrake Nonvotmg)

E. J . O r t h , Jr . , Electric Light & Power Group (Alternate to Ronald B. Singer)

V incen t J. Wanzek , Manufactured Hou~ng Instltute-Western Regional Office (Alter- nate to Dougla~ R. Bette}

Rene H. Yerke. Underwriters Laboratori~ Inc. (Alternate to W. J. Smith)

C h a r l e s E. Z l m m e r m a n , National Ele~ trical Manufacturers A~ocmtton (Alter- hate to L. E. Palmer)

N o n v o t i n g Member s

Rober t Buechne r . Natmnal Rccr~t ion & Park Amoclatlon Eric Ken t , Canadian Standards Ass~tatlon Wilford 1. S u m m e r s . National Fire Protection A~nclataon George H. Tryon , National Flr~ Protection Amoelation Brian Weir. Canachan Standards A~ociatlon

135

501B, 501BM, 501C

Since the publication of the above Committee list in the Technical Committee Reports, the following changes have been made in Committee membership:

Additions:

Sectional Committee on Mobile Homes James E. Lewis, American Society of Sanitary Engineering. Ronald B. Singer, Electric Light & Power Group (Alternate to E. J. Orth, Jr.).

Sectional Committee on Recreational Vehicles

Ralph E. Herzler, Recreation Vehicle Industry Association. James E. Lewis, American Society of Sanitary Engineering.

Deletions:

Sectional Committee on Mobile Homes William T. Nebraska, American Insurance Association. Ralph A. Brewster, American Insurance Association (Alternate to William T. Nebraska).

Sectional Committee on Recreational Vehicles

William T. Nebraska, American Insurance Association. Ralph A. Brewster, American Insurance Association (Alternate to William T. Nebraska).

Changes in Representation:

Correlating Co~=nittee on Mobile Homes and Recreational Vehicles Willard E. Bryant, National Conference of States on Building Codes and Standards.

Sectional Committee on Mobile Homes Willard E. Bryant, National Conference of States on Building Codes and Standards. Victor Suben, American Society of Mechanical Engineers.

Sectional Committee on Recreational Vehicles G. E. Bracken, Electric Light & Power Group. Victor Suben, American Society of Mechanical Engineers.

Vote Statement

Correlating Committee on Mobile Homes and Recreational Vehicles

On Part I of the Committee's Supplementary Report concerning portions of the Proposed 1976 Edition of the Standard for Mobile Homes as published on Pages 253 to 311 of the 1976 Technical Committee Reports for this Meeting, the ballots of the 18 members of the Correlating Committee show that: 15 have voted affirmatively, none negatively, and 3 have not returned their ballots to date (Messrs. Dwyer, Gross, and Keplinger).

Note: A revision proposed and balloted upon by the Committee for revising 2-17.5 was determined to be ineligible for processing as a part of this Supplementary Report by the Secretary of the NFPA Standards Council because the revision was considered a substantive change and had not been offered through the Public Comment process. It has, therefore, been deleted from this Report but will be processed as a proposed Tentative Interim Amendment to the 1976 Edition of the Standard (if approved).

On Part II of the Committee's Supplementary Report involving editorial corrections to the Proposed 1976 Manual on Mobile Home Heating and Cooling Load Calculations as published on Pages 312 to 346 of the 1976 Technical Committee Reports for this Meeting,the ballots of the 18 members of the Correlating Committee show that: 15 have voted affirmatively, none negatively, and 3 have not returned their ballots to date (Messrs. Dwyer, Gross, and Keplinger).

On Part III of the Committee's Supplementary Report concerning portions of the Proposed 1976 Edition of the Standard for Recreational Vehicles as published on Pages 347 to 381 of the 1976 Technical Committee Reports for this Meeting, the ballots of the 18 members of the Correlating Committee show the voting to be as follows:

a. On the Public Comments: 16 affirmative; none negative, and 2 ballots not returned to date (Messrs. Dwyer and Keplinger).

b. On the Additional Revisions: 14 affirmative; none negative; 2 requested to be recorded as not voting (Messrs. Barker and Latter), and 2 ballots not returned to date (Messrs. Dwyer and Keplinger).

136

501B, 501BM, 501C

Vote Statement

Sectional Committee on Mobile Homes

On Part I of the Committee's Supplementary Report concerning portions of the Proposed 1976 Edition of the Standard for Mobile Homes as published on Pages 253 to 311 of the 1976 Technical Committee Reports for this Meeting, the ballots of the 42 voting members show that: 35 have voted affirmatively, none negatively, and 7 ballots have not been returned to date (Messrs. Ashford, Barrow, Behrend, Evans, Gross, Peterson, and Rhoton).

Note: See Note under Vote Statement of the Correlating Con~nittee on this Part.

On Part II c f the Committee's Supplementary Report involving editorial corrections to the Proposed 1976 Manual on Mobile Home Heating and Cooling Load Calculations as published on Pages 312 to 346 of the 1976 Technical Committee Reports for this Meeting, the ballots of the 42 voting members show that: 33 have voted affirmatively, none negatively, and 7 ballots have not been returned to date (same as in Part I).

Vote Statement

Sectional Committee on Recreational Vehicles

On Part III of the Committee's Supplementary Report concerning portions of the Proposed 1976 Edition of the Standard for Recreational Vehicles as published on Pages 347 to 381, the ballots of the 35 voting members of the Sectional Committee show that: 31 have voted affirmatively, none negatively, 2 have requested to be recorded as not voting (Messrs. Barker and Latter), and 2 ballots have not been returned to date (Messrs. Heisel and Rhoton).

137

501B

PART I

Supplementary Report Revisions to 1976 Proposed Edition of NFPA No. 501B

001

Submi t te r :

John Ed Ryan for National Forest Products

Association.

Statement of Problem:

Paragraph 1-2, Definition of Combustible

Material: Definition of Combustible Material is too

specific and all encompassing. It would include

many safe materials, such as "Tectum," Gypsum

Wallboard, etc.

Recommendation:

Delete definition in toto without substitution

or refer to NFPA 220 or copy same definitions

for nonconfoustible & limited combustible & combustible as No. 220.

Supporting Comment:

Recommended action would eliminate confusion

& create uniformity in NFPA standards. Also there is little or no use of term in standard.

Committee Action:

Reject.

Committee Comment:

The recommendation confuses the Committee's effort to use the term "combustible" to refer to

materials that will ignite and burn with building construction types. The term as used in

this Standard refers to the types of materials described by the existing definition (e.g.,

4-6.3.4 and 4-6.9.1(b)3.).

002

Submi t te r :

Gerald E. Lingenfelter, American Insurance

Association.

Statement of Problem:

Paragraph 1-2: The definition of "mobile home" has been

revised so as to be incorrect.

Recommendation:

Delete "with or" from line four of the definition of the term "Mobile Home".

Supporting Comment:

Recognizing that this technical committee may

be frustrated by the adoption of the Federal

Mobile Home Construction and Safety Standard, and

that indeed the Committee may feel that it is no

longer needed, we believe that, if NFPA is to continue to publish a standard on mobile homes,

the standard must represent the best judgement of

the Committee and the NFPA membership, regardless of potential conflicts with the Federal Standard.

The proposed definition of "mobile home" is

incorrect since mobile homes which are placed on

permanent foundations come under the regulation of building codes because they are then permanent

structures or buildings. Because of discrepancies in minimum ceiling heights,

percentages of window openings,and room sizes, mobile homes placed on permanent foundations

would not comply with building code requirements

for dwellings and, therefore, would be illegal. For this reason, mobile homes should not be defined as being "with permanent foundations."

This recommendation would return the definition of "mobile home" to the concept previously

adopted by the Committee.

Committee Action:

Reject.

Committee Comment:

Local jurisdictions vary in their requirements

and it is thus a local option as to whether mobile homes may or may not be installed "with or without

permanent foundation."

O03

Submi t te r : Gerald E. Lingenfelter, American Insurance

Association.

Statement of Problem:

Paragraph 2-4: The definition of "interior finish" is in

conflict with the Life Safety Code, NFPA No. i01.

Recommendation:

Use the definition of "interior finish" as printed in the LSC, Sections 6-2111 through 6-2113.

Supporting Comment:

Recognizing that this technical committee may be frustrated by the adoption of the Federal

Mobile Home Construction and Safety Standard, and that indeed the Committee may feel that it is no longer needed, we believe that, if NFPA is to

continue to publish a standard on mobile homes, the standard must represent the best judgment of

138

501B

the Committee and the NFPA membership, regardless of potential conflicts with the Federal Standard.

The Life Safety Code adequately defines interior finish Additionally, the Code more reasonably controls paint and wallpaper. There is no need to confuse matters by making this definition different from that in the LSC. Just because the Federal Standard has a "mutated" definition is no reason to accept it here; indeed, the Federal Standard should be revised to agree with already recognized, consensus standards.

Committee Action:

Hold in abeyance.

Committee Comment :

The Mobile Home Committee notes that the Life Safety Code Co~nittee is revising its definitions of "interior finish" in its proposed 1976 Edition in Paragraphs 6-2.1.1 through 6-2.1.4. The Life Safety Code Committee's proposals contain significant changes from the 1973 Edition which is referenced by the Submitter. The Mobile Home Committee will consider this recommendation further for its next regular revision following action on the 1976 proposals being made by the Life Safety Code Committee, agreeing in principal with the recommendation by the Submitted.

004

Submit ter:

Gerald E. Lingenfelter, American Insurance

Association.

Statement of Problem:

Paragraphs 2-6~3.1 and 2-6.3.2: These sections contain no criteria for

internal pressures°

Recommendation:

Section 2-6.3.1 - Add 4th item as follows: "Internal pressures ........ 16 psf"

Section 2-6.3.2 - Add 4th item as follows: "Internal pressures ........ 26 psf"

Supporting Comment:

These structures (mobile homes) are subject to the same internal pressures caused by wind as permanent structures. The suggested values are taken from ANSI A58.1.

Committee Action :

Reject.

Committee Comment:

The data available to the Committee indicates that the present text is adequate and reasonable. The approach used in ANSI A58.1 is highly theoretical and depends on a number of factors (such as doors being opened or closed). It is believed that specifying internal pressures is redundant, and the Committee believes from all available data that the wind loads specified in 2-6.3.1 and 2-6.3.2 provide adequate guidance.

OO5 Submitter:

Gerald E. Lingenfelter, American Insurance Association.

Statement of Problem:

Paragraph 2-6.4: The roof load of 30 psf set forth for the North

Zone is inadequate for some areas.

Recommendation:

Add an exception, which states: "For certain areas of the North Zone, east of North Dakota, the roof loads shall be increased on the basis of local snow load conditions."

Supporting Comment:

According to ANSI A58.1, mobile homes located north of a line which starts on the south edge of Lake Ontario and extends eastward, north of Albany, to the northeast corner of Massachusetts, would be subject to roof loads considerably greater than 30 psf; in addition, there are portions of the states of Minn., Wisc., and Mich., in which the snow load would exceed 30 psf. These snow loads may be 40 or 50 psf or greater.

Committee Action:

Reject.

Committee Comment:

Local snow conditions in many parts of the country require special consideration. The Standard includes a Load Zone Map (Figure A-2-4). The Map has a lengthy caption which cites that it is a "generalization" and shows only the Load Zones generally identified in ANSI A58.1-1972. The Map also shows the three major mountain ranges, and the caption ends up stating that "determinations of required loads for any given mobile home installation can only really be made by the local authority having jurisdiction and requires engineering judgment." Each mobile home must have a Manufacturer's Certificate posted in the mobile home showing for which structural zone(s) of the U.S.A. the mobile home has been designed and the actual design external snow and/or wind live loads. It is felt that this is about as far as we can go. The suggestion made would not cover many other

139

501B

localized areas where snow loads would require that mobile home roofs should be designed to resist higher roof loads.

OO6

Submitter:

Gerald E. Lingenfelter, American Insurance Association.

Statement of Problem:

Paragraph 2-6.6.2(c): This section does not adequately describe the

circumstances under which a single anchor may be used.

Recommendation :

Revise last line to read, "is capable of withstanding both the force and direction of both loadings acting simultaneously."

Supporting Comment:

Recognizing that this technical committee may be frustrated by the adoption of the Federal Mobile Home Construction and Safety Standard, and that indeed the Committee may feel that it is no longer needed, we believe that, if NFPA is to continue to publish a standard on mobile homes, the standard must represent the best judgement of the Committee and the NFPA member- ship, regardless of potential conflicts with the Federal Standard.

More clarification and explanation of the circumstances under which a single anchor may be utilized is desirable. Where anchors have rods, the rods generally are not of sufficient size to prevent them from moving if the force is not in line with the tie; for example, a diagonal rod of an anchor designed to resist lateral forces will not be capable of resisting the vertical forces from a vertical (over-the-roof) tie.

Committee Action:

Rej ec t.

Connnittee Conment :

The Committee does not feel that the recommendation is a clarification or that it would add anything to the guidance now given.

Statement of Problem:

Paragraph 2-6.6.3: This section gives a blanket exemption from

vertical ties to double-wide mobile homes.

Recommendation:

Revise the section to read:

2-6.6.3 Design Criteria for Anchoring Systems - Double-Wide Mobile Homes. Anchoring systems for double-wide mobile homes shall be designed by a registered engineer or architect and installed to resist the lateral and uplift forces set forth by the provisions of the applicable Section 2-6.6.1 or 2-6.6.2.

Supporting Comment:

Recognizing that this technical conmlittee may be frustrated by the adoption of the Federal Mobile Home Construction and Safety Standard, and that indeed the Committee may feel that it is no longer needed, we believe that, if NFPA is to continue to publish a standard on mobile homes, the standard must represent the best judgment of the Committee and the NFPA membership, regardless of potential conflicts with the Federal Standard.

Since all mobile homes are required, by the provisions of Section 2-6.3.1 and 2-6.3.2, to resist vertical uplift forces as well as lateral forces, caused by wind, there should not be a blanket exemption for vertical ties on double- wide mobile homes. The design of the stabilization system, including vertical ties and anchors, depends upon many factors other than just the width of the structure.

Committee Action:

Rej ect.

Committee Comment:

This paragraph is a prescriptive alternative to an engineered system as indicated in the text and the Notes to Section 2-6.6. Note 2 to 2-6.6 states that "when the stabilizing system is designed by a properly qualified Registered Professional Engineer;..2-6.6.3 may be exempt." Paragraph 2-6.6.1 requires that the manufacturer provide printed instructions with each mobile home specifying the location and required capacity of stabilizing devices on which the design is based. It is felt that with these provisions no revision of 2-6.6.3 is necessary.

007

Submitter:

Gerald E. Lingenfelter, American Insurance Association.

OO8

Submitter:

Gerald E. Lingenfelter, American Insurance Association.

Statement of Problem:

140

501B

Paragraph 2-B.I: The section references the ASTM E162 test

method.

Recommendation:

Delete 2nd sentence of Section 2-8.1.

Supporting Comment:

Recognizing that this technical committee may be frustrated by the adoption of the Federal Mobile Home Construction and Safety Standard, and that indeed the Committee may feel that it is no longer needed, we believe that, if NFPA is to continue to publish a standard on mobile homes, the standard must represent ~he best judgment of the Committee and the NFPA membership, regardless of potential conflicts with Izhe Federal Standard.

The scope of ASTM E162, as printed by ASTM, is specifically restricted to research and development purposes. This is a positive indication that ASTM does not intend the test method to be used for regulatory purposes. (As an aside, ASTM E162 does not provide "flame spread ratings"; according to the test method, they are "flame spread indexes"). In addition, we are not aware of any data which indicates there is adequa~e correlation between E84 and E162 to warrant the acceptanceofmaterials on the basis of the results of either test method, which is what is permitted for Sections 2-8.1.3, 2-8.1.4, and 2-8.1.6.

Committee Action:

Considered in conjunction with Comment No. 009.

Committee Comment:

See recommendation on Comment No. 009.

009 Submitter:

A. J. Mercurio, Hartford, Connecticut.

Statement of Prgb[em:

Section 2, Paragraph 2-8.1: The phrase: "---when mounted and tested in a

manner similar to that in which they will be used.", as used in the first sentence of paragraph 2-8.1 is inaccurate, misleading and unworkable.

Replace the words "flame spread rating" with "flame spread index" in the second sentence of paragraph 2-8.1.

The reference to ASTM E-162-67 (1973 as the sole criteria for determining the "flame spread index" of plastic bathtubs, shower units and the like, is somewhat misleading and also somewhat inaccurate.

Recommendation:

A-2-8.1 Flame Spread Limitations: Numerical

141

flame spread ratings determined by the Standard Method of Test for Surface Burning Characteristics of Building Materials (ASTM E-84-73) or the Flame Spread Indices established by Test for Surface Flammability of Materials Using Radiant Heat Energy Source (ASTM E-162-67 (1973)) do not necessarily reflect the hazards of the material when installed in an inclined or vertical position of the configuration of a product in its end use.

In addition, it is recommended that the committee develop appropriate wording to indicate to the user that there are pitfalls and limitations which should be recognized and taken into consideration when ASTM small-scale type tests are utilized to determine the various flame spread ratings or indices.

Supporting Comment:

Experience has shown over the past few years that reliance on laboratory or small scale ASTM type tests as the sole criteria for determining the fire hazard of a material or product in its end use can lead to major problems.

When a test specimen is subjected to the ASTM E-84-73 Test, it is installed in a horizontal position, above the burners. Therefore, the determination of a flame spread rating for a material that, in its end use, is to be installed in an inclined or vertical position, is difficult if not impractical.

The replacement of the term "flame spread rating" with "flame spread index" is suggested merely to improve the accuracy of paragraph 2-8.1 as it is related to ASTM E-162, since there is no reference of "flame spread rating" in the Standard. ASTM E-162 Test is strictly a laboratory test where the test specimen is limited to 6-inch by 18-inch. The flame spread index derived from such limited size sample can, in no way, reflect the "mass effect" hazard which, large scale fires show, exists.

In addition, the last sentence of paragraph of 2.1 of Section 2 titled, "Summary of Method" in ASTM E-162 states:

"The orientation of the specimen is such that ignition is forced near its upper edge and the flame front progresses downward."

Since a majority of the real life fires that occur usually involve an upward travel of the flame front, the "flame spread index" of the material as established by the ASTM E-162 test is not a realistic index of the material tested when configured in its end use form.

A lesson should be learned from the experience of the plastic industry after its indictment by the FTC, a year or two ago. As a result of this incident, it is understood that ASTM has now included the following caveat into many of its standards, published after December of 1975:

This Standard should be used solely to measure and describe the properties of materials, products or systems in response to heat and flame under controlled laboratory conditions and should not be considered or

5013

used for the description, appraisal, or regulation of the fire hazards of materials, products or systems under actual fire conditions.

In view of this, it would seem prudent that wherever ASTM test methods are referred to in NFPA Standards, a similar, but more appropriately, worded caveat should also be included, if not in the text, at least in the Appendix.

Committee Action:

Delete the phrase reading: "when mounted and tested in a manner similar to that in which they will be used" as recommended by the Submitter. Replace the words "flame spread rating" with the words "flame spread index" in the second sentence as recommended by this Submitter and Comment No. 006. Correct an editorial error in the second sentence by deleting the reference to 2-8.1.4 and 2-8.1.6 and insert a reference to 2-8.1.5. As revised, the text of 2-8.1 will read:

2-8.1 Flame Spread Limitations. The surface flame spread rating of interior finish materials shall not exceed the following values when tested by the Standard Method of Test for Surface Burning Characteristics of Building Materials (ASTM E84-73). The surface flame spread index of interior finish materials required by 2-8.1.3 and 2-8.1.5 may be established using the Test for Surface Flammability of Materials Using Radiant Heat Energy Source (ASTM E162-67 [1973]).

Committee Comment:

The recommendations of Mr. Lingenfelter (006) and Mr. Mercurio (001) on 2-8.1 were considered together as they spoke essentially to the same

issues. It is recognized by the Committee that the Test Methods referenced are, as published by ASTM, for research and development purposes, but they are the only Test Methods currently available for the purpose which the Committee feels can be used to control the rates of surface flame spread across interior wall and ceiling surfaces. Since the ASTM is apparently inserting a caveat in their referenced Standards, the Committee does not feel that a similar caveat is needed in 5013 and, if attempted, could cause problems if the wordings were not identical. The Committee agreed with the editorial correction suggested by both Mr. Lingenfelter and Mr. Mercurio to use the term "flame spread indexes" in lieu of "flame spread ratings" in connection with the use of E164 reference. Another editorial error in the text was the reference in the preprinted text to 2-8.1.3, 2-8.1.4 and 2-8.1.6; the correct references should be to only 2-8.1.3 and 2-8.1.5. The Committee recognizes that correlation between the E84 and E164 test methods is questionable, but the need to use E164 comes about because using E84 is not feasible for testing cabinet doors and plastic bathtubs, shower units, and tub or shower doors due to the configurations involved. Correlation is not essential since

the test methods are not utilized on the same regulated components. The Committee agrees that Mr. Mercurio is correct in relation to the phrase requiring that the interior finish materials should be tested "when mounted and tested in a manner similar to that in which they will be used" and is thus recommending that this phrase be deleted.

OlO S u b m i t t e r :

Gerald E. Lingenfelter, American Insurance Association.

Statement of Problem:

Paragraph 2-8.1.4: This section will not prohibit highly

combustible materials within 6inches of cooking ranges or burner tops.

Recommendation:

Revise this section to permit the use of only "noncombustible or limited-combustible materials."

Supporting Comment:

Recognizing that this technical committee may be frustrated by the adoption of the Federal Mobile Home Construction and Safety Standard, and that indeed the Committee may feel that it is no longer needed, we believe that, if NFPA is to continue to publish a standard on mobile homes, the standard must represent the best judgement of the Committee and the NFPA membership, regardless of potential conflicts with the Federal Standard.

A flame spread rating of 50 will permit highly combustible materials, such as certain foamed plastic, to be within 6 inches or so of a flame. This is not safe practice. Noncombustible and limited-combustible materials are defined in NFPA No. 220 and provide more adequate control of materials used in the proximity of burners and cooking surfaces.

Committee Action:

Reject.

Committee Comment:

Attention is called to 2-8.2 of the Standard which controls the allowable types of materials for this location. This Section (2-8.1.4) is under 2-8.1 headed "Flame Spread Limitations." See also Committee Action on Conmlent No. 011.

142

501B

Oll Submit ter :

Gerald E. Lingenfelter, American Insurance Association.

Statement of Problem: Paragraph 2-8.2: This section refers to the "fire resistance"

properties of ~ypsum wallboard.

Recommendation:

Revise Section 2-8.2 to read: " ... shall have a minimum finish rating equivalent to 5/16 inch gypsum wallboard."

Supporting Co~nent:

Gypsum wallboard of any thickness does not, of and by itself, have fire resistance. Fire resistance and fire resistance ratings are provided by construction assemblies, e.g. walls, partitions, floors, etc. "Finish rating", however, is a measure of the heat transmission characteristic:~ of a material (usually measured over wood members).

Committee Action:

Revise the leading of Section 2-8 and revise 2-8.2 to read:

2-8 Fl~ne Spread Limitations and Fire Protection Requirements

2-8.2 Fire Protection Requirements of Walls~ Partitions and Ceilings Enclosing Furnaces and Water Heaters and Exposed Walls Adjacent to Cooking Ranges or Burner Tops. The interior surfaces of walls and ceilings encasing furnace and water heater enclosures (including nonmetalic doors for either interior or exterior access to the enclosures) and the exposed wall adjacent to the cooking range as defined in 2-8.1.4 shall be surfaced with 5/16 inch gypsum board or material having equivalent fire protective properties. At furnace and water heater spaces all openings for pipes and vents shall be tight-fitted or firestopped.

Committee Comment:

The Committee recognized that using the term "fire resistance" could be misleading but did not wish to use the term "finish rating" either. The revised wording suggested was thought to answer the criticism as equitably as possible at this time. Some test work on this issue is underway at the National Bureau of Standards under a research contract with HUD. It was agreed that this item should be placed on the agenda of the Fire Safety Subcommittee of the Construction Task Force for further study with the change recommended herein as an interim improvement which the Committee felt would respond with the basic intent of the Comment.

012 Submit ter :

Daniel H. Brown, American Plywood Association.

Statement of Problem:

Paragraph A2-3.5(b): One of the reference standards has been updated.

Recommendation:

Revise the reference from PS 1-66 to PS 1-74.

Supporting Comment:

Product Standard PS 1-66 was revised by the Department of Commerce in 1974.

Committee Action:

Approve recommendation.

Committee Comment:

The update is appropriate.

013 Submit ter :

Daniel H. Brown, American Plywood Association.

Statement of Problem:

Paragraph A2-5: Editorially update the plywood reference.

Recommendation:

Revise the reference to softwood plywood to read as follows:

Plywood - Construction and Industrial, USDC, PS 1-74.

Supporting Comment:

This shows that the Product Standard is promulgated by the U. S. Department of Commerce. Also the correct title and designation for the standard is shown.

Con~nittee Action:

Approve recommendation.

Co=~ittee Comment:

The update is appropriate for the incorrect entry now reading: "Softwood Plywood - Construction and Industrial...PS-74."

143

501B

014

Submitter:

John Ed Ryan, for National Forest Products Association.

Statement of Problem:

Paragraph A-2-5 Reference Table: Editorial.

Recommendation:

Under Wood & Wood Products and after "Softwood Plywood - Construction and IndustriaP' change PS-74 to "U.S.D.C.-P.S. 1-75." Also immediately above change U.S.D. to "U.S.D.C."

Supporting Comment:

Editorial.

Committee Action:

Action on the first Recommendation was taken under Comment 013. The second correction offered by this Comment was approved by the Committee.

Committee Comment:

Correction of editorial error.

015 Submitter:

Richard G. Gewain, American Iron and Steel Institute.

Statement of Problem:

Paragraph A-2-5: Incorrect designations of Standards.

Recommendation:

i. Revise date of Specification for the Design of Light Gage Cold Formed Stainless Steel Structural Members to 1974.

2. Correct Reference for Standard Specifications for Open Web Steel Joists, J-and H- Series to SJI and AISC - 1974.

Supporting Comment:

Purpose is to update standards to most current edition and to correct typos.

Conmlittee Action:

Approve recommendations.

Committee Comment:

The updating is appropriate and the typo- graphical error was unintentional.

Explanation of Editorial Revisions to the Proposed 1976 Edition of the Standard for Mobile Homes (Proposed NFPA No.501B-1976;ANSI AI19.1-1976)

Based on Actions Taken at the Meeting of the Sectional Co~m~ittee held July 13-14~ 1976

The following proposed revisions are editorial in nature and are based on comments received during the balloting period from members of the Sectional Committee and members of the Correlating Committee on Mobile Homes and Recreational Vehicles. Those included herein are items which the Sectional Committee, at its July 13-14, 1976 meeting felt should be made in the interest of editorial accuracy and to assure the maximum possible degree of the Standard's effectiveness. Other comments received from Committee members not considered urgent or requiring further study were referred back to the appropriate Task Forces for study or will be handled as Tentative Interim Amendments. The Sectional Committee thus asks for approval of the following additional revisions:

I. Paragraph 2-4. Change the word "footer" to the word "footing" in the "Definitions Applicable to Chapter 2" and where the term "footer" is used throughout the text. The word "footing" is a more acceptable engineering term for the application involved. No change in the definition is necessary. The word change would also be necessary in the definitions of the word "Pier," "Stabilizing Devices," and "Support System." Correlation will be necessary with the Sectional Committee on Mobile Home Installations to make a similar word change in NFPA No. 501A-1975 (ANSI AI19.3-1976).

2. Tables 2-20.3 and A-2-5. U_~date the reference in the Table to the latest edition (1975) of the ANSI Z97.1 Standard where it appears in Table 2-20.3 (under the heading "Requirements") and in Table A-2-5 where it appears under the heading "Windows and Glazing."

3. Table A-2-5~ Page 501B-52~ TCR Page 274. Correct the address of "PFS" to "Product Fabrication Service, 1619 West Beltline Highway, Madison, WI 53713."

4. A-2-6.5.2. Editorially revise the text for clarification of intent so that the text will read:

A-2-6.5.2 Handle or Latch to Operate Window. Any handle or latch required to operate the emergency egress provisions of the window shall be attached in the factory by either a permanent method or a mechanical method. If a mechanical method is used, it shall be so designed that removal of the handle or latch or overtightening of the handle or latch will require a tool not commonly available in the home.

Note: If removal of the latch or handle would not limit the effectiveness of the egress feature of the window, this provision can be ignored providing it would still not be possible to adjust the mechanical device to exceed the operational force specified in A-2-6.5.1.

501B, 501BM

5. A-2-7.5.5. Insert the word "window" before the word "manufacturer" in the first sentence to clarify the responsibility involved~ the revised first sentence to read:

The window manufacturer shall show evidence of continued compliance by affixing a quality certification label to the product in accord- ance with ANSI Z34.1, "American National

Standard Practice for Certification Procedures."

6. Paragraph 4-5.14.1. Delete the words "normal operating" in the 7th line so that the third sentence will read:

"The source of pressure shall be isolated before the pressure tests are made."

PART I I

Supplementary Report Revisions to 1976 Proposed Edition of NFPA No.501BM

Explanation of Editorial Revisions to the Proposed Manual on Mobile Home Heating and Cooling Load Calculations for Determining Compliance with the Energy Conservation Criteria of the Standard

for Mobile Homes

Proposed NFPA No. 501BM-1976; ANSI AI19.1. I-1976

No "Public Comments" were received on this Proposed Manual. These revisions reflect comments received during the balloting period from members of the Energy Concersation Task Force, its Sectional Committee on Mobile Homes, or the Correlating Committee on Mobile Homes and Recreational Vehicles. Those revisions included herein are items which the Sectional Committee at its July 13-14, 1976 meeting felt should be made in the interest of editorial accuracy and to assure the maximum possible usefulness of the Manual. Other comments received from Committee members not considered urgent or requiring further study were referred back to the Energy Conservation Task Force for study. The Sectional Committee thus seeks approval of the following editorial revisions of the preprinted material on Pages 312 to 346 of the Technical Committee Reports.

General: i. Delete the "degree signs" where they appear

in the text to be consistent with current practices that suggest that F or C only be used to indicate degrees Fahrenheit and degrees Centigrade. (Authority: Chapter 28 of the ASHRAE Handbook of Fundamentals 1972~ Page 549).

2. Paragraph 4-i~ Page 501BM-12~ TCR Page 315. In line 1 of the text the subscript of "Uo" should be deleted so the phrase reads: "The thermal transmittance, U, for each series heat-flow path .... "

3. Paragraph 4-2.1.I(d)~ Page 501BM-13~ TCR Page 315. Delete the reference in the caption to " o r • p , i Nonventllat_d Air Spaceso that the caption reads: "(d) Ventilated Air Space."

4. Figure 4-2.2, Page 501BM-13, TCR Page 315. Correct error in the Figure by changing the reference from "R-18 Insulation" to "R-19 Insulation" (last right rule on graph).

5. Paragraph 4-3.2.3 (New)~ Page 501BM-17, TCR Pa e~317. Add the following text as new Paragraph 4-3.2.3. This text was overlooked in the drafting of this Manual. The text shown is

picked up from the 2nd sentence of 2-10.3.5 of Proposed NFPA No. 501B-1976 as published on Page 501B-31, TCR Page 263.

4-3.2.3. If there is an air space of at least ½ inch (12.7 n~n) between the duct and the insulation, the heat loss need not be calculated if the cavity in which the duct is located is assumed to be at 70 ° F (21. i°C).

6. Worksheet 4-3.3(c)~ Page 501BM-19, TCR Page 318. Insert the left-hand portion of the diagram appearing at the top of Page 501BM-19 over the captioned Worksheet 4-3.3(c) covering Unheated Floor Cavities on Page 501BM-18.

7. Worksheet 4-3.3(c) Heated Floor Cavities, Page 501BM-19~ TCR Page 318. Make only the following corrections:

Heating Cooling Framing Cavity Area Area

ii Percentage of Area * 5 95 5 95 12 Percent of 'U' .012 .ii0 .O12 .114 13 Total 'U' .122 .126

and add a footnote to read:

• In this example specific data are available to indicate that the floor framing area is 5 per cent.

8. Paragraph 4-3.6.6~ Page 501BM-25~ TCR Page 321. Delete the phrase "They do not have physical significance" in the line starting "U 1 and X are quantities defined for convenience" leaving only the last quoted portion. In addition~ revise the last six lines on the Page to read:

"After the heat loss (heating) has been calculated, the ceiling transmission coefficient is obtained by dividing the heat loss by the inside-to-outside temperature difference and then entered into the U x A column, Line 16, of the U o Worksheet 4-4. The heat gain (cooling) is entered in the heat gain column, line 14, of the Heat Gain Calculation, Worksheet 7-2.8.

9. U o Worksheet 4-4, Page 501BM-26~ TCR Page 322). Make the following editorial changes:

Framing Cavity Area Areal

145

501BM, 501C

a. In line 9~ under the "U" column, insert the words "See Table A-3-9."

b. In line i0, under the "U" column, insert the words "See Table A-3-9."

c. In line 15, under the "U" column, insert the words "See 4-3.2.2."

d. In line 19, change the reference from "Line 17" to "Line 18" so that the text will read: "If Line 18 is less than Line I, the mobile home complies with Thermal Envelope Requirements."

e. Change the double asterisk Note to read: "**If overhead duct is used, insert value from indicated calculations in 4-3.6 and 4-3.6.4."

i0. Paragraph 5-1, Page 501BM-27, TCR Page 322. Change the caption of this Paragraph to be more explicit, the revised Paragraph heading, with no other text change, to read:

5-1 Method of Calculating Transmission and Infiltration Heat Loss.

II. Paragraph 5-1 (Step 2), Page 501BM-27, TCR 322. As an editorial correction, replace "UA"

in the denomination of the equation with UoA o .

12. Appendix, Table A-3-5, Page 501BM-45, TCR ~ . Revise this Table to be consistent with "Recommended Specifications for the Application and Finishing of Gypsum Board," GA216-75, published by the Gypsum Association, 1603 Orrington Avenue, Evanston, Illinois 60201, Table 8, Thermal Conductivity Values in BTU/Hour/ sq. ft./degree F, the revised Table to read:

Table A-3-5 Gypsum or Plaster Board

Thickness (Inches) R-Factor 5/16 .28 3/8 .33 1/2 .42 1 .85

13. Appendix, Tables A-6-1, A-6-2 and A-6-3, Pages 501BM-48, 501BM-49, TCR Page 333. Delete these Tables since, as noted in the text, they are the same as Tables 7-2.2.1(b),7-2.7 and 7-3 on Pages 501BM-30 and 501BM-32 (TCRPages 324 and 325) and thus are redundant. This will permit eliminating the cross-references to the Appendix Tables in the last mentioned Tables.

PART I I I

Supplementary Report Revisions to 1976 Proposed Edition of NFPA No. 501C

001

Submitter:

Victor Suben for American Society of Mechanical Engineers.

Statement of Problem:

Paragraphs 2-6.3 and 2-6.4: Insufficient information given.

Recommendation:

Each running trap shall have a water seal of not less than 2 inches and not more than 4 inches.

Running traps shall be not less than i-~ inches in diameter. A trap shall not be larger than the waste pipe to which it is connected.

(These provisions might be combined with the existing wording in sections 2-6.3 & 2-6.4)

Supporting Comment:

The referenced paragraphs give specific dimensions for the size and depth of P-traps. No equivalent dimensions are given for running traps.

Committee Action:

Reject.

Committee Comment:

"Running" traps are, in fact, "P" traps and are only "running" traps by virtue of their location in the plumbing system. "P" traps are "listed" pieces of equipment. Paragraph 2-6.8 (Length of Tailpiece) describes where a "P" trap can be installed to become a "running" trap.

002

Submitter:

Victor Suben for American Society of Mechanical Engineers.

Statement of Problem:

Paragraphs 2-9.1.1, 2-9.6 and 2-10.6.2: Editorial clarity.

Recommendation:

2-9.1.1 should be combined with the requirements of 2-9.6 because both provisions touch on the same subject.

146

501C

Similarly Section 2-4.1.2 states that all plumb- ing components shall be listed or approved. The repetition of the statement in section 2-10.6.2 specifically for vents indicates that listing or approval may not be required in those instances where it is not specifically mentioned.

Supporting Comment:

By keeping all statements regarding a given subject in one section of the code, there will be less ambiguity, and less need for individual interpretation.

Committee Action:

Reject.

Committee Comment:

The Committee feels that this, and other, editorial improvements could appropriately be made hut felt that the recommendation as regards combining 2-9.1.1 and 2-9.6 should he looked at for editorial clarity by the Plumbing Task Force at its next meeting while also looking at other areas wherein some excess verbiage might be eliminated. They did not wish to act on this item only as there seemed to be no real problem in understanding the intent. It was pointed out that 2-4.1.2 covered the requirements for plumbing system "components" while 2-10.6.2 covered "system" approvals and listings. It was felt that both Paragraphs should be retained for this reason. Mr. Suben, who was present, agreed with this handling of his comment.

003

Submitter:

Victor Suben for American Society of Mechanical Engineers.

Statement of Problem:

Paragraphs 2-12.2, 2-12.3 and 2-12.1: Requirements of the code are ambiguous.

Recommendation:

2-12.1 All pressure water piping in the water distribution system shall be subjected to one of the following tests:

2-12.1.i The test shall be made by subject- ing the system to air or water at I00 psi, etc. (wording as shown in report)

2-12.1.2 A system pressurized by a deman pump only, etc. (wording as shown in report)

2-12.1.3 A recreational vehicle that has no plumbing fixtures other than a sink with a manual pump shall be tested at i0 psi for a minimum of 3 minutes.

Supporting Comment:

As written, the code would require that each and every recreational vehicle be subjected to a I00 psi test in addition to the test to be run at the maximum discharge pressure of the pump. No pressure is given for the test for the vehicle with only a sink.

Committee Action:

Accept in principle.

Committee Comment:

Revise the text to read as follows:

2-12 Plumbing System Test_s

2-12.1 Water Piping System Tests. All pressure water piping in the water distribution system shall be subjected to a pressure test. An adequate and accurate pressure gage or bubble-type leak detector shall be used on all tests. Tests shall be performed to one of the following methods, as appropriate. When any substance other than potable water is added to the water distribution system, that substance shall be listed for use in a potable water system.

Note: Warning - Ethylene glycol, methanol based antifreeze, or other poisonous chemicals shall not be used.

2-12.1. i Pressurized System Test. The test shall be made by subjecting the system to air or water at i00 psi (689 kPa) or at the maximum setting of the pressure regulator (if jprovided) for i0 minutes without leakage or loss of pressure. Pressurized systems serving a single fixture shall be permitted to be tested at I00 psi (689 kPa) for a period of 3 minutes.

2-12.1.2 Demand System Test. The test shall be made by subjecting the system to air or water to the maximum discharge pressure of the pump for a period of I0 minutes without leakage or loss of pressure.

Secretary's Note: It will be necessary with thls change to renumber 2-12.4 (and its sub- paragraphs 2-12.4.1, 2-12.4.2, and 2-12.4.3), 2-12.5 and 2-12.6 to become 2-12.2 (with its subparagraphs 2-12.2.1, 2-12.2.2, and 2-12.2.4), 2-12.3 and 2-12.4 respectively.

0O4

Submitler:

P. A. Smith, P. A. Smith & Associates.

Statement of Problem:

Paragraph 3-4.4.4: The sentence should be clarified to insure the

147

501C

limitations of the protection provided by the requirement is understood.

Recommendation:

The outlet of each container service valve shall

be equipped with a listed excess flow valve in

order to prevent excessive vapor discharge in the event of failure in the line between the excess

flow valve and the attached regulator only.

Supporting Comment:

The listed excess flow valves available and the

listed regulators being used are of such capacity that a line failure downstream of the regulator will not cause closure of the excess flow valve.

Therefore, it should be pointed out if the

regulator is attached to the container service valve approximately 2" of the line will be

protected by the excess flow valve in the event

of complete failure. If a connector is used between the container service valve and the

regulator, only the connector will be protected

by the excess flow valve in the event of complete failure.

Committee Action:

No action.

Committee Comment:

This suggestion is really a warning or sets forth the rationale for an excess flow valve. It

was not considered essential for this Standard

as the Standard is designed primarily for the manufacturers of recreational vehicles and not

consumers. (Secretary's Note: The Committee did

decide in connection with Public Comment No. 005 to revise the language in 3-4.4.4, and reference to the Committee Action on this latter Com~nent

should be made.)

005

Submitter:

Harold B. Wright, Fisher Controls Company.

Statement of Problem:

Proposed 3-4.4.4:

The proposal needs changes to overcome the following problems. 3-4.4.4 The excess flow

valve should be allowed to be installed in either the service valve inlet (internal) or outlet (external).

(a) The present wording allows any excess flow valve to be installed regardless of whether it will operate in the system.

(b) The present wording would allow an excess flow valve to be installed in such a manner that

an external force beyond the excess flow valve can result in breakage between the container and the excess flow valve.

(c) The standard does not provide information requiring testing of excess flow valves.

(d) The standard should advise that the excess flow valve will not protect against a break in

the outlet piping from a regulator installed downstream of the excess flow valve, to overcome a false sense of security.

Recommendation:

3-4.4.4 The inlet or outlet of each container service valve shall be equipped with a listed excess flow valve.

(a) The line and connections being protected, both upstream and downstream of the excess flow

valve shall be sized to pass the rated closing capacity of the excess flow valve.

(b) External excess flow valves shall be

installed in such a way that any undue strain beyond them will not cause breakage between the

container and the excess flow valve.

(c) Excess flow valves shall be tested at

the time of initial installation by breaking a joint at the furthermost point downstream being protected.

CAUTION: Make this test in a safe location.

(d) Excess flow valves are intended to provide protection only to the inlet of the regulator installed downstream.

Supporting Comment:

3-4.4.4 Excess flow valves installed internally

with the service valve inlet are available, and

are safer since they also provide protection if the service valve is sheared off at its inlet pipe

thread. Internal excess flow valves also are

protected from external damage. Reference:

NFPA 58-1974, Table 2-3, Items 2 and 3.

(a) Proper sizing of the excess flow valve and

the system piping is required. Otherwise any

excess flow valve could be used, which might not close when needed, or would close prematurely

resulting in the operator removing it. Reference: NFPA 58-1974, 3135(a)(3).

(b) Safe practice requires that the excess flow valve must not break from a force on the

downstream piping so the excess f]owvalve breaks

off of the container. Reference: NFPA 58-1974, Note 4 to table 2-3.

(c) Like any mechanical safety device, testing will assure the excess flow valve has not been

damaged in shipping, or installation, and that its closing flow is not greater than the piping system will handle. Reference: NLPGA Safety Article No. 113-55.

(d) It is common knowledge to properly trained LP-gas men that excess flow valves will

not close from a break in the piping that occurs downstream of the regulator.

Committee Action:

Revise text as shown below:

148

501C

3-4.4.4 LP-Gas Excess Flow Valves. A listed LP-Gas excess flow valve shall be provided in accordance with the following:

a. The inlet or outlet of each service valve of a permanently mounted container shall be equipped with such a listed excess flow valve or a listed POL adapter with an integral excess flow valve.

b. Vehicles having removable (DOT) type containers shall have furnished or installed a listed POL adapter with an integral listed excess flow valve.

Committee Comment:

While this action may not completely satisfy the Submitter, the Committee felt that it did answer the first part of the recommendation with the addition noted in 3-4.4.4(b) above which the Committee felt was needed where removable type containers are used. The other recommendations were felt to be too complex to handle without the advice of the Heating Task Force of the Sectional Committee and were referred to that Task Force for their future detailed consideration.

OO6

Submitter:

Harold B. Wright, Fisher Controls Company.

Statement of Problem:

Paragraph 3-4.5.2: Conflict between NFPA 58, 2470, and NFPA 501C,

3-4.5.2.

Recommendation:

3-4.5.2 Final stage regulators shall be equipped on the low pressure side with one or both of the following:

(a) A relief valve having a start-to-discharge pressure setting of not less than 1.7 times and not more than 3 times the delivery pressure of the regulator.

(b) A shutoff device that shuts the gas off at the inlet side when the downstream pressure reaches the overpressure limit of not less than 1.7 times and not more than 3 times the delivery pressure of the regulator. Such a device shall not open to permit flow of gas until it has been manually reset.

Supporting Co,cent:

Manufacturers of regulators require the same start-to-discharge setting limits in all standards on regulator internal relief valves.

High pressure shutoff regulators do not vent gas under overpressure conditions, but shutoff, thereby conserving gas, as well as eliminating the possibility of the gas igniting.

Committee Action:

Accept proposal.

Committee Comment:

Committee agrees with the proposal as made by the Submitter and the need to avoid conflict with NFPA No. 58.

149

007

Submitter:

A. J. Mercurio, Hartford, Connecticut.

Statement of Problem:

Paragraph 5-4.1: The reference to ASTM E-84-73as the sole

criteria for determining the "flame spread classification' of interior finishes is somewhat misleading and also somewhat inaccurate especially when vertical or slanted.

Recommendation:

A new paragraph should be included in the Appendix of the Standard to read as follows:

A-5-4.1 Flame Spread Limitations. Numerical flame spread ratings determined by the Standard Method of Test for Surface Burning Characteristics of Building Materials (ASTM E-84-73) or the Flame Spread Indices established by Test for Surface Flammability of Materials Using Radiant Heat Energy Source (ASTM E-162-67 [1973]) do not necessarily reflect the hazards of the material when installed in an inclined or vertical position of the configuration of a product in its end use.

In addition, it is recommended that the committee develop appropriate wording to indicate to the user that there are pitfalls and limitations which should be recognized and taken into consideration when ASTM small-scale type tests are utilized to determine the various flame spread ratings or indices.

Supporting Comment:

Experience has shown over the past few years that reliance on laboratory or small scale ASTM type tests as the sole criteria for determining the fire hazard of a material or product in its end use can lead to major problems.

When a test specimen is subjected to the ASTM E-84-73 Test, it is installed in a horizontal position, above the burners. Therefore, the determination of a flame spread rating fora material that, in its end use, is to be installed in an inclined or vertical position, is difficult if not impractical.

A lesson should be learned from the experience of the plastic industry after its indictment by

501C

the FTC, a year or two ago. As a result of this incident, it is understood that ASTM has now included the following caveat into many of its standards, published after December of 1975:

This Standard should be used solely to measure and describe the properties of materials, products or systems in response to heat and flame under controlled laboratory conditions and should not be considered or used for the description, appraisal, or regulation of the fire hazards of materials, products or systems under actual fire conditions.

In view of this, it would seem prudent that wherever ASTM test methods are referred to in NFPA Standards, a similar, but more appropriately, worded caveat should also be included, if not in the text, at least in the Appendix.

Committee Action:

Reject.

Committee Comment:

The Committee recognizes that the test method is only for research and development but feels that it is the only test method which is available for the purpose which the Committee feels can be used for the intended purpose. Since the ASTM is apparently inserting a caveat in their referenced Standard, the Committee does not feel that a similar caveat is needed in 501C, and, if attempted, could cause problems if the wordings are not identical.

Explanation of Additional Revisions to the Proposed 1976 Edition of the Standard for

Recreational Vehicles (Proposed NFPA No. 501C-1976;ANSI AI19.2-1976)

Based on Actions Taken at the Meeting of the Sectional Committee held

July 14-15, 1976

The following proposed revisions are based on comments received during the balloting period from members of the Sectional Committee and members of the Correlating Committee on Mobile Homes and Recreational Vehicles. Those included herein are those which the Sectional Committee, at its July 14-15, 1976 meeting, felt should be made in the interest of editorial accuracy and to assure the maximum possible degree of the Standard's effectiveness. Other comments received from Committee members not considered urgent or requiring further study were referred back to the appropriate Task Forces for study. The Committee thus asks for approval of the following Ii additional revisions.

i. Section 2-3. insert the following two new definitions of terms used in the Standard in ~propriate alphabetical order:

I Flexible Drain System means a liquid waste drainage system (9ncluding the trap, strainer, hose and connectors) with a minimum free waterway of 5/8 inch (0.625 inch) inside diameter (or equivalent passage) used where authorized under 2-10.6.2.

I Side-Vented Drainage System means a liquid waste drainage system utilized in conjunction with a one- or two-compartment sink, lavatory fixture, or shower with no more than a 2-inch drain opening and includes the trap, strainer, pipe and vent connections for use where authorized under 2-10.6.1.

2. Paragraph 2-9.8. Insert new wording in the second sentence of this Paragraph to correlate with the change in Paragraph 2-12. i and to cover safeguards for solutions utilized for sanitizing if water distribution systems~ the second sentence, as enlarged~ to read:

Instructions for proper sanitizing of water distribution systems shall be consistent with those recognized by the U. S. Public Health Service and shall be furnished with each vehicle.

3. Paragraph 2-10.6. For editorial clarity and to eliminate vagueness~ revise this text to read:

2-10.6 Side-Vented Drainage Systems and Flexible Drain Systems

2-10.6.1 Side-Vented Drainage Systems. A side-vented drainage system may be used when a recreational vehicle has only liquid waste plumbing fixture(s) and drain opening(s) are not more than 2 inches (51 mm) in diameter underthe following conditions:

a. The side-vented drainage system shall be constructed of approved or listed components.

b. The side-vented drainage system installation shall have the following features:

(i) A baffle or diverter tee shall be Jsed to connect the trap arm to the side-vent drainage system when used with a two-compartment fixture.

(2) "P" traps shall be l~-inch minimum diameter installed as close to the fixture as possible with the center of the outlet not more than 6 inches (152 mm) from the bottom of the fixture or other approved trap system.

(3) The center of the horizontal vent offset shall be located not less than 2~ inches (57 ran) above the bottom of the highest fixed fixture and may terminate through the outside wail at a level lower than the offset. The drain may terminate through the outside wall above the floor or extend vertically through the floor to the exterior or shall be permitted to discharge into a liquid-waste holding tank.

Note: See 2-10.2.1, Exception Nos. 1 and 3 for related information on drain outlets.

150

501C

2-10.6.2 Flexible Drain Systems. A flexible drain system may be used only on a single-compart- ment sink. Each flexible drain system shall be a listed system. A flexible drain system shall be permitted to be connected to the fixed drain piping with approved fittings below the vent offset through the wall or be installed as provided in 2-10.2.1.

Note: See 2-10.2.1, Exception No. 3 for related information on drain outlets.

4. ~ h 2-i0.9.1(b). Delete the phrase: "within 36 inches (915 ram) of the tank drain outlet" in the second sentence as an unnecessary limit_ation and to permit better vehicle stabilit~ when used on the highway, the revised paragra~ to read:

b. Drain opening shall be 1½ inches minimum pipe size located at the lowest point in the tank. A listed full-way valve shall be directly connected to the tank or installed in the drain pipe of the tank.

5. Table A-2.1. Delete the words "drain, waste, and vent pipe" from the titles of the Specification for Acetyl Copolymer (AC) Plastic and the Specification for Homopolymer (AH) Plastic pipes as an editorial correction and substitute for these words the word "Fittings." The NSF Standard referenced covers only AC and AH plastic pipe fittings--not "DWV" piping. The revised entries will thns read:

I Specificatio~ for Acetyl Copolymer (AC) Plastic Fittings ...... NSF Std. 14

Specification for Homopolymer (AH) Plastic Fittings ...... NSF Std. 14

6. Section 3-3. Change the definition of "Liquefied Petroleum Gases" to be consistent with the new (1976) edition of NFPA No. 58~ the revised definition to read:

Liquefied Petroleum Gases~ LPG~ and LP-Gas, includes any material having a vapor pressure not exceeding that allowed for commerical propane composed predominantly of any of the following

l hydrocarbons or mixtures of them: propane, propylene, butane (normal butane or iso-butane), and butylene (including isomers).

7. Paragraph 3-4.2.5. To eliminate vagueness in the present text, revise this paragraph to read:

3-4.2.5 Shielding of LP-Gas Containers from Heat of Internal Combustion Engine Exhaust System Components. LP-Gas containers located less than 18 inches (457 mm) from any component of an internal combustion engine exhaust system shall be shielded by a vehicle frame member or by a noncombustible baffle to dissipate radiated or convected heat with an air space on both sides of the frame member or baffle.

8. Paragraph 3-4.4.3. Revise the first sentence only of this text to respond to recommendations on safeguarding LP-Gas systems on recreational vehicles by inserting the words "two-stage" before the word "regulator/' the revised sentence to read:

two-stage regulators supplie~ Listed shall be

9. Paragraph 3-6.2.1. Revise the last sentence only using a similar text to that in the second sentence of 3-7.2.1 for editorial uniformity, the revised last sentence to read:

I The installer shall leave the manufacturer's instructions in the recreational vehicle.

i0. Paragraph 3-6.3.4. Change the letter size from 3/16 inch to 3/8 inch as it was in the 1974 edition of the Standard to assure maximum visibility of this important warning. With this change, the first sentence of the text would read:

"A permanent warning label with 3/8 inch (9 mm) high letters shall be affixed in a conspicuous manner adjacent to fuel- burning ranges which shall read:"

ii. Fibre A-5-5. Change theword "major" t~ the word "minor" in the caption of this Figure t~ correct a Secretary's error.

151