Is .3521.1999 Safety Belt,Harness

7/29/2019 Is .3521.1999 Safety Belt,Harness

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IS 3521 (1999, Reaffirmed 2002): Industrial Safety Belts

and Harnesses--Specification (Third Revision). ICS

13.340.99


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'J-fllf!dJ2j J1lrJC!5IS 3521 : 1999(Reaffirmed 2002)

~ til PI Cf) wan ~ q xi \Nil q? q -q - ~ ~ I(dJ 1 1 f ! I y;rftfH7JT)

Indian StandardINDUSTRIAL SAFETY BELTS AND HARNESSES -SPECIFICATION

April 1999

( Third Revision)First Reprint JULY 2008(Including Amendment No. 1 & 2)

ICS 13.340.99

BIS1999B U R E A U O F I N D IA N S T A N D A R D SMANAK BHAY AN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002Price Group 6


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Industrial Safety Sectional Committee, CHD 8

FOREWORDThis Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalizedby the Industrial Safety Sectional Committee had been approved by the Chemical Division Council.Safety belts are required to protect persons from injury by arresting the fall in the event of the user losing his/herbalance or support and failing from the place of working either at an elevation or in closed locations or containers.This standard covers safety belts and safety harnesses together with the accessories, such as safety lines, lifelines, safety clamps; hooks, etc, for proper use in safety installations. It does not cover anchorages but it isemphasized that secured anchorage point should be located before using any type of safety belt.In selecting suitable equipment, that is, belt or harness for a particular duty, care should be taken to ensure thatsuch equipment gives the wearer protection, as far as possible, and also ensures safety, maximum degree ofcomfort, freedom of movement and in the event of falling, the greatest possible security against injury eitherfrom the impact from ground or from surrounding structures or from the belt itself.This revision of the standard is based on current knowledge and practice concerning the use of systems thatincorporate a harness to restrain the body. In this revision, the harness has been classified on the basis of variouspositions of work. In addition to this, minimum width and thickness of the webbing for waist straps have beenspecified. This revision also specifies the static and dynamic strength for which the test methods have beenprescribed.In this revision, the following new requirements have been introduced:

a) Static load test, andb) Dynamic load test.

Full body harnesses have also been incorporated in this standard in line with International Standard ISO/CD, 10333-1 'Personal fall arrest system: Part 1 Full body harness'. Further the flammability resistance testmethod has also been modified in this revision.Equ-ipment complying with this standard should satisfy ergonomic requirements and 3hould only be used if thework allows means of anchorage and can be carried out safely. Personnel should be trained and instructed inthe safe use of the equipment and be observant of such training and instruction.While preparing this standard, assistance has been derived from several standards including AS 1891: 1976'Industrial safety belt and harnesses', issued by the Standards Association of Australia, EN 361 'Personalprotective equipment against fall from a height', EN 358 'Personal protective equipment for work positioningand prevention of falls from a height', ISO/CD 10333-1 'Personal fall arrest systems: Part 1 Full body harness' ,ISO/DIS 10333-2 'Personal fall arrest systems: Part 2 Lanyards and energy absorbers', and ISO/CD 10333-4'Personal fall arrest systems: Part 4 Fall arresters and vertical systems'.Composition of the Committee responsible for formulation of this standard is given in Annex F.For the purpose of deciding whether a particular requirement of this standard is compli ed with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2 : 1960 'Rules for rounding off numerical values (revised)'. The number of significant places retained in therounded off value should be the same as that of the specified v a l u \ . ~ in this standard.


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Al\1ENDl\1ENT ]\T(), 1 l \ ~ [ A Y 2003TOIS 3521 : 1999 INDUSTRIAL SAFETY BELTS ANDHARNESSES - SPECIFICA TION( Third Revision)

( Page 1, clause 2 ) - Substitute 'IS 3203 : 1982 "Methods of testing localthickness of ciectroplated coating (iirst revision)' for 'IS 4171 : 1983 C o p p : ~ rrods and bars for general engineering purposes (first revision)'.

( Page 1, clauses 3.3 and 3.4 ) - Delete and renumber the subsequentclauses.

( Page 3, clause 5.2.5, line 9 ) - Substitute 'plating or powder' fo r 'plating,pOWder'.

( Page 3, clause 5.2.5, line 12 ) - Subst itute 'IS 3203' for 'IS 4171'.( Page 8, clause B-2, Title) Substitute the following for the existing:

'B-2 TESTS FO R CLASS D, CLASS E AND CLASS L'( Page 8, clause B-2.1, line 1 ) - Substitute 'belts or harnesses' for 'beltsharnesses' .( Page 8, Table 2 ) - Subst itute the existing table with the following:

S l l ~ ( ) .(1)ii}iii)

Table 2 Free Fall Distance( Clauses B-2.l and D-4 )

Class(2)DEL

Distance in 111, LUax(3)1.80,60.6

( Page 9, clause B-3, 'Title ) ~ Substitute 'CLASS P' for 'TYPE 4LINEMAN POLESAFETY BELT'.


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Amend No.1 to IS 352] : 1999( Page 9, clause B-3.1 ) -- Substitute the follO\ving tur the existing:

'B-3.1 Attach the safety belt or harness to the dummy as it would be worn bythe worker. Secure the work positioning attachment element with a properlyaffixed rigid anchorage. Raise the dummy in an upright position until the axis ofthe \\lork positioning attachment round the dummy and anchorage point arehorizontaL Hold the dummy in poisition by a quick release device. After therelease when the dummy has come to rest examine for any slippage, damage orother deterioratioI1_ '

2


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text:

AMENDMENT NO.2 AUGUST 2007TOIS 3521 : 1999 INDUSTl1IAL SAFETY BELTS AND

HARNESSES - SPECIFICATION( Third Revi!.;ioll)

(Page 2, clause 5.1, para 1) - Substitute the following for the existing

'The ITIlnllTIUm width of all straps shall be 40 mm except shoulder retainingstrap, which shall be of minimum \vidth of 20 mm.'

(Page 8, Table 2, clause reference) - Substitute 'Clause B-2.1' fo r'Clauses B-2.1 and 0-4'

(Page 9, Annex D) - Delete the subtitle 'Dynamic Testing Drop Distancesand Attachment Points for Fall Arresting Harness (Class A)'.

(Page 10, clause D-4) - Substitute the follO\ving for the existing text:'a) Fit the miiculated human dummy with the harness equipped with lanyard

and without an energy absorber.b) Suspend the dummy by its upper attachment point and raise to an extent

that the total free fall shall be of 4 m and the maximum horizontal distanceii-om the central line shall be 300 mm. Hold it with the quick release device.

c) Release the dummy without initial velocity, the feet first free iall being 4 m.Observe whether the harness releases the dummy. Also observe theorientation of the dummy and measure angle between the longitudinal axisof the dorsal plane of the dummy and the vertical.

d) Using same rope, repeat the test procedure within 15 1 min suspendedii"om its lower attachmen t point and achieve a head first free-fall of 4 m. '

(CHD 8)


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IS 3521 : 1999

Indian StandardINDUSTRIAL SAFETY BELTS AND HARNESSES

SPECIFICATION( Third Revision)

1 SCOPE1.1 This standard prescribes requirements of safetybelts and harnesses and their components generallyfor the following duties:

a) Industrial duty in plant and maintenancework while working at higher elevations;

b) Construction, erection, installation and suchother jobs;

c) vVorking of electrical servicemen and linemenon general duty or high tension installationpoles; installation and overhead maintenanceand also for service to outdoor transformersand other similar jobs;

d) Men working inside shipholds, tankers,silos, chimneys, manholes, sewers or similarother enclosed spaces;

e) Maintenance of buildings, structures or similar jobs, such as paintings, window cleaning,chimney cleaning, etc; and

t) Repairs of:i) Mineshafts, headgears and other places

located at higher elevations.ii) Open-cast mines, quarries, etc.

1.2 This standard also prescribes methods of samplingand test for industrial safety belts and harnesses.2 REFERENCESThe Indian Standards given below contain provisionswhich through reference in this text, constituteprovision of this standard. At the time of pUblication,the editions indicated were valid. All standards aresubject to revision and parties to agreements based onthis standard ar e encouraged to investigate th epossibility of applying the most recent editions of thestandards:

IS No.101(Part 3/Sec 2) :1989

397(Part 1) : 1972

TitleMethods of sampling and test forpaints; varnishes and relatedproducts, Part 3 Tests for paint filmfonnation, Section 2 Film thickness(third revision)Method for statistical quality controlduring production : Part 1 Controlchait for variables revision)

IS No.4171 : 19834905 : 1968

TitleCopper rods and bars for generalengineering purposes (first revision)Methods for random sampling

3 TERlVlINOLOGYFor th e purpose of this standard, th e followingdefinitions shaI1 apply.3.1 Safety BeltTh e equipment which provides protection and safety " ,. . . . ;I 1. l ' 16 11In S,lIuatlons gIven In 1,,1 generallY, anu !nc!uues Lillcomponents/fittings required for its use.

NOTE - Fig. I shown is for guidance only.3.2 \Vaist BeltThat part of the safety belt or harness which is fasten.edround the waist3.3 Pole StrapThe part of the safety belt for electricians which isfastened round a pole or similar structure.3.4 Pole BeltThe combination of the waist belt and pole strap asused by electricians.3.5 Safety HarnessThe assembly, which consists of the waist belt togetherwith shoulder straps (and also leg straps where suchprovision is necessary at the option of the user).3.6 LanyardThe line, which is generally used for connecting thesafety belts or safety harness to an anchorage point.3.7 Life LineThe line, which provides linear communicationbetween the user and the rescue party at the remotedjstance by tension or other means, particularly in anenclosed space.3,g Load Bearing ComponentsAll parts and components of safety belts or safetyharnesses and also of safety lines which carry load inthe event of an alTested fall, or during the hoisting ofthe user.


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IS 3521 : 19994 CLASSIFICATIONThis standard covers the following types of belts andharnesses.4.1 All fuB body harnesses shaH be classified asClass A - Fall Arresting.4.1.1 Class A - Fall ArrestingClass A harnesses are designed to support the bodyduring and after the arrest of a fall.Class A harnesses shall have one D-ling for fall arrestattachment affixed to both shoulder straps at the backor at the front.4.2 Optionally, full body harnesses could be classifiedunder one or more classes. The identifications of theseclasses are: .

Class D - Controlled descentClass E - Confined entry and exit (raising andClass L - Ladder climbing (frontal attachment)Class P - - "Vork positioning

4.2.1 Class D - Controlled DescentClass D harnesses are those which meet the requirements for Class A harnesses ~ l I 1 d which are alsodesigned for controlled descent from a height.Class D harnesses shall have front- or side-mountedD-rings, but they shall not be mounted at waist level.4.2.2 Class E -- Vertical Entry and ExitClass E harnesses are those which meet the requirements for Class A harneSSes and which are alsodesigned to support the user during entry into andexit from confined spaces, usually involving thelowering and raising of the user.Class E harnesses shall have a sliding D-ring on eachshoulder strap.4.2.3 Class L - Ladder ClimbingClass L harnesses are those which meet the requirements for Class A harnesses and which are designedfor use with a fan arrest system mounted on or adjacentto ladders or towers.Class L harnesses shall have one or two D-ringsattached to the front of the harness.

Class P harnesses are those which meet the requirements for Class A harnesses and which are designedto position the user during a work operation. ClassP harnesses shall have D-rings mounted at waistlevel.

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5 DESIGN AND CONSTRUCTIONWebbing and thread elements shall be made fromsynthetic fibres, having characteristics consistent withthose of polyamide and polyester.Sewing threads shall be physically compatible withand of a comparable quality to that of the webbing,but shall be of a different colour from that of thewebbing in order to facilitate visual inspection.A full body harness shall comprise of straps or similarelements which are placed in the pelvic area and onthe shoulders, for example, as shown in Fig. 1. Th efull body harness shall fit the wearer. Means ofadjustment may also be provided.The straps shall not migrate from their positions andshall not loosen by themsel ves.The harness shall contain the body and shall distributesuitably the dynamic fall arrest forces and post-fallshall not create any supplementary risk and shall otIeran acceptable degree of comfort.It shall b.e poss'ible to carry out a visual inspection ofall the components of the harness. I f it is dismantled,it shan be impossible to reassemble it incorrectly.

NOTES1 Th e fall arrest attachment elcment(s) may be placed in such away so that during the use of the harness these lie in front of thechest, at the shoulders, and/or at the back of the wearer.2 The harness may also be built in within a garment. All loadbearing points and components of harnesses and also of safetylines shaH carry load in the event of an arrested fall or during thehoisting of the user.

5.1 Width and Strength of the StrapsThe minimum width and thickness of webbing forwaist straps shall be 40 mm and 3 mm respectively.The waist belts shoulder straps, hoisting straps, salestraps and all types of belts and harnesses shall notbreak under a minimum tensile load of 19.6 kN(2 000 kg).5.2 Materials5.2.1 WebbingAll belts and harnesses shall be made from nylon orother synthetic materials, such as polyester. Thematerial shall have a uniform thickness and uniformwidth. The waist belt, shoulder straps, hoisting straps,pole straps and all types of safety belts and harnessesshall be made from nylon/polyester webbing. Th e testspecimen shall be of entire cross section whoseminimum width and thickness should be 40 mm and3 mm respectively,


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IS 3521 : 1999

SHOULDER STRAPS

FALL ARRESTATTACHMENT( FAA)

SHOULDERSTRAPRETAINER

lY I THiGH S i R A P S / ~ 1BUCKLESBACK FRONT

FIG. 1 EXAMPLE OF HARNESS

All the materials used in the production of V'vebbingand rope shall pass the flammability tests as given inAnnex A.5.2.2 Threads .f(Jr Se'vvingThreads for sewing the load bearing components shallhave similar physical and chemical properties to thatof the materials being sewn. Number of stitches shallbe not less than 3 per cm and the type of thread shallbe synthetic fibre such as nylon, polyester etc. Thethreading shall be of different colour from that ofwebbing in order to facilitate visual inspection.5.2.3 Rivets and WashersAll rivets and washers if used for joining the varioussections shall be made from copper.5.2.4 Life Line/Safety LineOnly nylon, polyester or synthetic fibre shall be used.The breaking load shall be a minimum of 19.6 kN(or approx 2 000 kg) when tested in accordance withtest method reference.5.2.4.1 Working at heightThe length of lanyard shall not be more than 3 m inlength subject to the condition that free fall shall no tbe more than 1.8 m.

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5.2.4.2 The length of the life line shall be decided asagreed to between .the purchaser and the supplier.5.2.5 A1etal ComponentsAl l metal components shall be solid or forged in sucha manner that the joints are not visible and the joinedpart of the metal does not impair the strength orquality. The surface shall be smooth finished and freefrom any manufacturing defects, burrs or unevensurface. In order to protect all metal fittings againstcorrosion and/or other chemical reaction, it isnecessary that all the fittings sha11 be coated bychromium plating, powder coating. The minimumthickness of chromium plating shall be 8 microns whenmeasured in accordance with the method prescribedin IS 4171 whereas for powder coating the thicknessshall be minimum 45 microns when measured inaccordance with the method prescribed in IS 101(Part 3/Sec 2). Care shall also be taken that the partof metal fittings matching with the webbing shall besmoothly finished, rounded and designed to preventdamage to the webbing, etc.Hooks, clamps or other fastening and holding devicesshall be of similar quality and properly treated orplated. The design of the hooks shall be self-closingtype and care shall be taken to ensure that if pressureis exerted accidentally on the tongue or latch, theyshall no t disengage.


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IS 3521 : 1999I f any springs are used, then they shall be so arrangedand loaded that when the hooks are closed, the springsrest in position and are free from any movement untilpressure is applied to release or to engage.Aluminium, magnesium or titanium metals or alloysthereof shall not be used.5.3 Requiremeats5.3.1 StrengthHooks and main load bearing metal parts and fittingsshall not break under the test load of 19.6 kN(2000 kg). The load shall be applied as closely aspracticable in a manner in which the component isstressed in service.5.3.2 Attachment MeansIn order to avoid that a parson attaches a sub-. . . . . . . .connectIng system to ,In Incorrect attacnment pOInts,no loop made of textile shall be present and bucklesother than those meeting the prescribed requirementsof this standard shall be of a smaller size such as aclear distinction from those.5.3.2.1 Peljormance testsTh e attachment of metal parts, load bearingcomponents and the making of splices and joints shallbe such that finished assembly shall pass theprescribed performance test, as given in Annex B.

NOTE - The complete assembled harness when subjected toperformance test shall be destroyed to avoid its reuse.5.3.3 Static LoadThe harness shall withstand a 15 kN load when testedin accordance to the static load test given in Annex Cwithout releasing the dummy, and the test is appliedin turn to each attachment element.NOTE- The static test does not require a test machine but aload indicator is needed. A simple test frame and a \vinch areenough.

5.3.4 Dynamic LoadThe effect of the velocity of the test discovery at theend of free fall on the performance of the harness andthe effect on the shape of the test dummy, shall becanied out as per the method given in Annex D.6 SAMPLINGThe method of drawing samples of harnesses andstraps from a lot shall be as given in Annex E.7 INSTRUCTIONS FO R GENERAL USE,MARKING, PACKAGING AND MAINTENANCE7.1 Instructions for General UseClear instructions in the appropriate national and

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regional language, for fitting, adjustment and use shallbe supplied with each harness. Such instructions shallalso include the following information:

a) The name of the manufacturer;b) Where appropriate, the name and address

of the supplier or such other information as .enables the supplier to be traced;

c) A statement of the purposes and limitationsof the product;

d) A warning against making any alterations oradditions to the product:

e) A warning against the dangers which mayarise in looping lanyards and vertical lifelines around structures that are of smalldecamenter or that have small or sharp edgeradii;

f) In cases y./here securing backles (that is, buck-IA.n .......+h _ ...i.-..n_ ...1-..,..,..-..", . , .


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equipment and those factors that should causethe equipment to be discarded;

t) An instruction that any component that is notmarked in accordance with this standard beremoved from service; and

u) An instruction that any equipment that hasbeen used to arrest a fall be removed fromservice.

7.2 Marking7.2.1 Marking on HarnessesHarnesses shall be clearly and indelibly marked orpermanently labelled by any suitable method no thaving a harmful effect on materials with the followinginformation:

a) The type of harnesslbelt;b) The name, trade-mark or other means of iden

tification of the manufacturer or the supplierwho is responsible for acting on behalf of the

IS 3521 : 1999manufacturer for claiming compliance withthis standard;

c) Manufacturer's product identification information that shall include the manufacturer'sbatch or serial number that enables theorigin of the item to be traced;

d) The year of manufacture;e) The identity of the fibre used as the material

of construction;f) Information that states by appropriate means

the intended purpose of each attachment element and to identify specifically those attachment elements that are designed to be usedas part of a complete fall arrest system; and

g) Warning for not to devia te from the manufacturer's instructions.

7.3 Packaging

moisture-proof material.\ , , / r ~ l n n l n ( r In" A ~ ! - ' t ' ' ' ' b .. .

ANNEX A(Clause 5.2.1)

FLAMMABILITY RESISTANCE TESTA-I GENERALA-lo1 This is a small-scale laboratory screeningprocedure fo r comparing the relative burningbehaviour of vertically oriented plastic specimensexposed to a low energy level, ignition.A-l.2 This method of test determines the afterflamelafterglow times and damaged length of specimens. Itis applicable to solid and celliJlar materials having anapparent density of not less than 250 kg/m3. Thismethod is not applicable for materials that spring awayfrom the applied flame without igniting.A-l.3 The classification system described is intendedfo r quality assurance and the preselection ofcomponent materials for products. This system is notintended to assess the fire behaviour of buddingmaterials, furnishings, complete items of equipmentor finished parts.A-2 OUTLINE OF THE METHODA test specimen bar is supported vertically by one endand the free end is exposed to a specified gas flame.

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The burning behaviour of the ba r is assessed bymeasuring the afterflamel afterglow times.A-3 SIGNIFICANCE OF TESTA-3.1 Test made on a material under the conditionsspecified may be of considerable value in comparingthe relative burning behaviour of different materials,in controlling manufacturing processes or in assessingany change in burning characteristics prior to, orduring use. The results obtained from this methodare dependent upon the shape, orientation andenvironment surrounding the specimen and theconditions of ignition. Correlation with performanceunder actual service condition is not implied.A-3.2 Results obtained in accordance with this methodshall not be used to describe or appraise the fire hazardpresented by a particular material or shape under actualfire conditions, unless used as one element of a firerisk assessment that takes into account al J of the factorsthat are pertinent to the assessment of the fire hazardin a particular end use for the material. Assessmentfor fire hazard requires consideration of such factors


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IS 3521: 1999as fuel contribution, intensity of burning (rate of heatrelease) products of combustion and environmentalfactors such as the intensity of source, orientation ofexposed material and ventilation conditions.A-3.3 Burning behaviour as measured by this testmethod, is affected by such factors as. density, anyanisotropy of the material and the thickness of thespecimen.A-3.4 Certain materials may shrink from the appliedflame without igniting. In this event test results arenot valid and additional test specimens are requiredto obtain ten valid tests. I f the test specimens continueto shrink from the applied flame without igniting, thesematerials are not suitable for evaluation by this methodof test.A3.5 The burning behaviour of some plastic materialsmay change with time. It is accordingly advisable to

I T l a ~ = e tests befc1fe arId after ageing by all appro.priateprocedure. The preferred ageing conditions shall be 7days at 70C; However, other ageing times andtemperatures may be used by agreement between thepurchaser and the supplier and shall be noted in thetest report.A-4 APPARATUS}\-4.1 L a b o r ~ t o r ) ' Fume Hood (cupboard) rl(lving aninside volume of at least 0.5 m3 shall be used whentesting the specimen. The chamber shall permitobservation and shall be draught-free while permittingnormal thermal circulation of air past the specimenduring burning. For safety and convenience, it isdesirable that this enclosure (which may he completelyclosed) be fitted with an evacuation device, such asan exhaust fan to remove products of combustionwhich may be toxic. However, it is important to notethat the device shall be turned off during the actualtest and started again immediately after the test toremove the products of combustion.

NOTE - The amollnt of oxygen available in support combustion is naturally important for the conduct of these flame tests.For tests conducted by this method when burning times are protracted chamber sizes less than 1 m3 may not provide accurateresults.

A-4.2 Laboratory Burner - - A Bunsen burnerhaving a tube length, of 80 to 100 mm and an insidediameter of 9.4 +i.6 mm. The tuhe shall not be-0.0equipped with an end-attachment such as a stabilizer.

A ~ 4 . 3 Ring Stand, with Clamps or the- - adj LIstable for posi tioning of theA-4.4 Device --- accurate to 1.A-4.S l\1easuring Scale - - graduated in mm.

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A4.6 Supply of Technical Grade lVlethane Gas with regulator and meter for uniform gas flow. Othergas mixtures having a heat content of approximately37 MJ/m3 have been found to provide similar results.A-4.7 Desiccator - - containing anhydrous calciumchloride or other drying agent.A-4.8 Conditioning Room or Chamber - capableof being maintained at 27 2C and a relativehumidity of 65 5 percent.A-4;9 Complementa ry Apparatus (see Fig. 2)A-4.10 Dry Absorbent Surgical CottonA-4.11 Full-Draught A i r - C i n ~ u l a t i n g Ovenminimum of 25 air changes/hour, capable of beingmaintained at 70 PC or other agreed temperature.

n

IIU01'

JCOTTON\

FIG. 2 VERTICAL BURNING-BEHAVIOURTEST ApPARATUS

A-5 SPECIMENSA-5.l All specimens shall be cut from a representativesample of the material (sheets or from end products),or shall be cast or injection, compression or transferrnoulded to the necessary form. After any

care shall be taken to remove all dust andfrom the surface, cut edges shaH h a v ( ~ asmooth finish .


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A-5.2 Standard bar specimen shall be 125 5 mmlong, 13.0 0.3mm wide and 3.0 0.2 mm thick.Other thickness may be used by agreement betweenthe purchaser and the supplier and, if so shall be notedin the tes t report.

NOTE - Tests made on specimens of different thicknesses ordensity arc not compara ble and tests made in different directionsof ani sotropy may also not be comparable .

A-5.3 A minimum of 26 bar specimens shall beprepared. It is advisable to prepare additionalspecimens in the event that the 'situation describedin A-3.4 is encountered.A-6 CONDITIONINGA-6.1 Unless otherwise required by the materialspecification, the following shall apply.A-6.1.1 Two sets of 5 bar specimens shall bepreconditioned for at least 48 h at 27 2C and 65 5percent relative humidity.A-6.1.2 Two sets of 5 bar specimens shall bepreconditioned for 168 h at 70 1C and then cooledin a desiccator (A-4.7) for at least 4 h at ambienttemperature.

A ~ 6 . 1 . 3 All specimens shall be tested in a standardlaboratory atmosphere of 27 2C and 65 5 percentrelative humidity.A-7 PROCEDUREA-7.1 Clamp the specimen from the upper 6 mrn ofits length with the longitudinal axis vertical so thatthe lower end of the specimen is 300 mm above ahorizontal layer of dry absorbent surgical cotton(50 mm X SO mm) thinllcd to a maXlrrlUTrt UnCOlTI-pressed thickness of 6 mm (see Fig. 2).A-7.2 Adjust the burner to produce a blue flame20 1 mm high. The flame shall be obtained byadjusting the supplying and air ports of the burneruntil an approximate 20 mm yellow-tipped blue flameis produced. Increase the air supply until the yelIowtip disappears. Measure the height of the flame againand adjust it if necessary.A 7.3 Place the name of the burner centrally underthe specimen, so that the top of the burner is 10 mmbelow the lower end orthe specimen, and allow it toremain there for lOs. Withdraw the burner to adistance at least 150 mm away and simultaneouslystart the timing device. Note the afterfiame time ti inseconds. I f the specimen drips molten or flamingmaterial during flame application, the burner may betilted to an angle of 45 to avoid material drippinginto the tube of the burner. However, the 10 mmdistance shall be maintained between the major portionof the specimen and the tilted burner.

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IS 3521 : 1999A-7.4 When afterflaming of the specimen ceases,immediately place the flame of burner again under thespecimen. After lOs turn off the burner and note theafterflame t2 and afterflow t3 times of the specimen.A-7.5 The test procedure shall be conducted on atleast five specimens.A-S EXPRESSION OF RESULTSA-S.l Calculate the total afterflame timetfi in seconds,for an individual specimen, using the formula:

wheret1 first afterflame time, in seconds;t2 second afterflame time, in seconds; and

specimen number.A- 8.2 For each se t of five specimens from a givenpreconditioning treatment, calculate the total setafterflame time in seconds, using the formula:

i==S~ tf i1=1where i and tri are as defined in A-S.lA-S.3 Calculate the combustion time tei in seconds,for an individual s p e c i m e n ~ using the formula:

wherei and t2 are as defined in A-S.I; andt3 = afterglow time, in seconds.

}\-9 CATAGORIES OF BURNING BEHAVIOURThe behaviour of the specimens shall be classified inone of the categories given in Table 1 CFV = Flamingvertical specimen) determined by selecting theappropriate column, using test results to answer theconditional questions posed.AtO TEST REPORTThe test report shall include the following particulars:

a) Complete identification of the product tested,inc1udin'g the manufacturer's name, numberor code;

b) The thickness to the nearest mrn, of the testspecimen;

c) The direction of any anisotropy relative tothe test specimen dimensions;

d) Conditioning treatment;e) Any prior treatment before testing, other than

cutting, trimming and conditioning; andf) Classification according to the category code

designation specified in A-9.


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IS 3521 : 1999Table 1 Categories of Burning Behaviour

(Clause A-9)SI Conditions CategoryNo. (see Note 1 )

r(1) (2) (3) """""'- "4) (5) (6)i) If : Any individual specimen total afterflametf, ~ l O s s s >30 sii) And: Total set afterllame time lr, . s 5250 s ~ 2 5 0 s >250 siii) And: Any individual specimen combustion time after the s s s > 60 s

second flame application leiiv) And: After flame or afterflowing up to the specimen holding clamp No No No Yesv) And: Cotton indicator ignited by flaming particles or drops No No Yes Yes

orNovi) Then: The category is FV-O FV-l FY-2 (see Note 2)

NOTES1 I f only one specimen from a set of five specimens for a given preconditioning treatment does not comply with the requirements for acategory, another set of five specimens subjected to the same preconditioning shall be tested. All specimens from the second set shall complywith the appropriate requir emenls for the category.2 The material may not be categorized by this method.

ANNEXBPERFORMANCE TEST

B-l EQUIPMENTCarry out the test using an articulated anthropometricdummy having a mass of 100 5 kg and an overallheight of 1.6 to 1.8 m with"waist not more than100 cm circumference, as in Fig. 3.B-2 TESTS FOR TYPE 1, TYPE 2 AND TYPE 3B-2.l Attach the safety belts harnesses to be testedtogether with safety line to the dummy exactly as itwould be worn by a human wearer. Attach free end ofthe safety line through the safety hook to a rigid anchorpoint. Raise the dummy in an upright position and holdin such manner that the anchorage and the attachmentpoint of the safety belt are as far as possible in the samevertical axis. Adjust the position of the dummy so thatwhen the quick release device is operated the dummyis allowed to fall freely. The free fall distance for eachsafety belt will be the same as prescribed in Table 2.Operate the quick release device and allow the dummyto fall freely. When the dummy has come to rest,examine for any damage, slippage or other deterioration.B-2.1.1 Retest the same safety belt/harness with thedummy in the same manner with a fall of 1.5 timesthe length of the previous fall and note whether dummyis retained clear of the ground. Examine for anydamage to main load bearing components.

SINo.(1)i)ii)iii)

Table 2 Free Fall Distance(Clauses B-2.1 and D-4)

Class(2)ADE

Distance in mm, Max(3)1.80.60.6

250

380

460

8

--...11-----;.-175 AP PROXj o r f - - - . f - - - - - + - - - I ~ - 510 APPROX

LAP HINGE

FIG. 3 ARTICULATED HUMAN DUMMY


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B-3 TEST FOR TYPE 4 LINEMAN POLE SAFETYBELTB-3.1 Attach the pole belt to the dummy exactly as itwould be worn by the worker. Secure pole strapextended to its minimum length around one side of asteel link having a round cross section of over 20 mm.The link as shown should be- secured to a rigidanchorage point horizontally. Hold the dummy inposition by a qujck release device.

IS 3521 : 1999After the release when the dummy has come to restexamine fo r an y slippage, damage or otherdeterioration.B-3.1.1 Retest the safety belt with the dummy in thesame manner with a fall of 1.5 times the length of theprevious fall and note whether the dummy is retainedclear of the ground. Examine for any damage to mainload bearing components.

ANNEX C(Clause 5.3.3)

DETERMINATION OF STATIC LOADC-l OUTLINE OF METHODThe }larness ttJ ttl;:, tested sllall be put on the iest \veightas though the test weight were a person. Al ladjustments shall be made to ensure snug fi t of theharness to the test weight.C-2 PROCEDURETo each attachment element in tum, apply a 10ad of

15 kN between the respective attachment element ofthe harness and the lower ring of the dummy, ensuringthat the time to reach the load is greater than 3 min(in order to avoid any dynamic effect). Maintain theforce for a period of 2 min.

NOTE - Although this is a load test, this test also permits thestudy of the behaviour and movement of the variOLis componentsand their effect on the physical safety of the user.

ANNEXD(Clause 5.3.4)

DETERMINATION OF DYNAMIC LOADDynamic Testing Drop Distances and Attachment Points for Fall Arresting Harness (Class A)

D- l OUTLINE OF METHODWhen the dynamiC performance test applied in turnto each attachment element, that is designed to be usedas part of a complete fall arrest system in the harness,shall withstand two falls (one 30 cm and the headfirst) with or without deformation but without releasingthe dummy. After each fall the dummy shall be in ahead-up position and the angle between the dummyspine and the vertical shall be maximum of 50. Thetest mass shall remain suspended after the drop for aminimum of 2, 5 or 10 min.D-2 TEST CRITERIA

a) The drop distance shall be l. 0 m.The test lanyard shall be attached to the backD-ring.Th e hoisting wire rope or chain shall beattached to:i) neck point for one test (feet-first drop);and

9

ii) crotch point for one test (head-first drop),b) Fo r the feet-first test, the uppermost inner sur

face of the O-ring shall be positioned 200 mmbelow the nat end of the neck of the testweight. For the head-first test, the D-ringshall first be positioned as in the feet-firsttest and then weight shall be lowered untilthe lanyard is straight, but without load onthe O-ring and then raised 1.0 m for the droptest.

c) A new harness shall be submitted for each ofthe above tests,During this test two main questions are:i) the effect of the velocity of the test

discovery at the end of the free fall onthe performance of the harness, and

ii) the effect on the shape of the test dummy.


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IS 3521 : 1999D-3 APPARATUSD-3.1 Harness ApparatusD-3.2 Human DummyThe human dummy for static and dynamic testing ofrelevant components and systems shall conform to thedimensions and requirements described at Fig. 3.The mass of 100 kg should have a tolerance of 5 andoverall height of 1.6 to 1.8 m with waist not morethan 100 cm circumference.D-4 PROCEDUREAttach the harness to be tested together or with safety

line to the dummy exactly as it would be worn by ahuman wearer.Attach free end of the safety line through the safetyhook to a rigid anchor point. Raise the dummy in anupright position and hold in such manner that theanchorage and the attachment point of the harnessare as far as possible in the same vertical axis. Adjustthe position of the dummy so that when the quickrelease device is separated the dummy is allowed tofall freely. The free fall distance for each harness willbe as prescribed in Table 2. Operate the quick releasedevice and allow the dummy to fall freely. When thedummy has come to rest, examine for any damage,slippage and other deterioration.

ANNEXE(Clause 6)

SAMPLING OF SAFETY BELT

E-1.1 LotAll the units of product, from those submitted forinspection at one time, produced under reasonablysimilar conditions of manufacture including timematerial and process shall be grouped together toconstitute a lot.E-1.2 Samples shall be seleted at random from eachlo t separately and tested in order to ascertainconformity to the requirements of this specification.E-1.3 In order to ensure randomness of selection, useshan be made of random number tables. In case sucha table is not available, the following procedure shallbe adopted:

Starting from any unit, count them in one orderas 1,2,3 ..... , etc, up to r and so on, where r is theintegral part of Nln (N being the total number inthe lot and n being the number selected for thetest). Every rth unit thus counted shall bewithdrawn to constitute the sample (see IS 4905).

E2 SAMPLING OF RAW MATERIALS ANnCOMPONENTS

E ~ 2 . 1 To build reliable performance into the finalassemblies of safety belt and straps, reliability of thecomponent parts shall be ensured during productionby reducing the quality fluctuations to the minimum

10

through applications of statistical quality controlmethods [see IS 397 (Part 1)]. When adequateproduction control is maintained by the manufacturer,the past record of test results on components will bereadily available to the purchaser for scrutiny and forthe purpose of final inspection only small samples needbe tested by him. Therefore, it is recommended thatthe manufacturer may carry out tests and maintainrecords of test results on the raw materials andcomponents parts according to the procedures givenin E-2.2 and E ~ 2 . 3 respectively.E-2.2 Whenever the Indian Standard specificationexists for raw materials used in the manufacture mayeither obtain certificates from the supplier certifyingconformance of the raw materials to the relevantspecifications or he may test for conformance the rawmaterials according to test procedure specified in thoseIndian Standard specifications and maintain recordsof tests.E-2.3 In the case of the components, as given in thisspecification the manufacturer may conduct tests forascertaining conformance to the specified requirementsaccording to Table 3 if the tests are not destructive andaccording to Table 4 if the tests are destructive. Thesamples for test shall be selected at random. The lotshall be considered satisfactory if all the samples satisfythe requirements of this specification.


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IS 3521 : 1999Table 3 Sample Size of Component Parts for

Non-destructive TestsE-3 SCALE OF SAMPLING OF ASSEMBLEDSAFETY BELTS AND STRAPS

No. of Unitsin the Lot

(1)Up to 2526 "150

151 " 1 0001 00 1 and 'above

(Clause E-2.3)No. of Units

in the Sample(2)

51320

E-3.1 For the purpose of performance test theassembled safety belts and straps shall be selected atrandom and shall be in accordance with co] 2 of Table 5.E-3.2 All the assemblies selected in E-3.1 shall besubjected to performance test.

Table 4 Sample Size of Component Parts forDestructive Tests

Table 5 Sample Size of Assembled Belts andStraps for Performance Test

(Clause E-3.1)

No. of Unitsin the Lo t

(1)Up to 2526" 100

101 " 500

(Clause E-2.3)

501 and above

No. of Unitsin the Sample

(2)1235

No of AssembledSafety Belts

(1)Up to 2526 " 100

101 " 500Over 500

ANNEXF(Foreword)

COMMITTEE COMPOSITION

No. of Belts Selectedfor the Test

(2 )J245

Industrial Safety Sectional Committee, CHD 8SllR] K. C. GUPTA

MembersSmuPREM BAWEJA

SHRI B. VIJAY KUMAR (Alternate)SHRI BHAGWATI PRASAD

SIIR I SATISH CHANDEn. ( ~ 4 1 t e r n a t e )

SHRJ R. SRINIVASAN (Alternate)DR D. R. CHAWLA

SHRI M. K. BANErJEE (Alternate)DIRECTOR (MINES S.Ll.FETY)

Sm:.J A. K. RUDRA (Alternate)SUR! V. K. Go a

SHRI M. L. AHUJA (Alternate)SH[U 1. P. GOENKA

SliRI N. DU1TA (Alternate)SHRIM. KANT

SHRI KIRIT MARU (Alternate)Sl!RI G. S. K!>,SHYAPDR V. K. JAIN

SlIRI K. SENGUPTA (Allernale)SllRJ M. K. MALHOTRASHRJ H. N, M!RASHIDR A. S. GHOSHAL

SERi 1


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IS 3521 : 1999(Continued/rom page 11)

MembersSHRI L. C. GUPTA

SHRI H. S. RAWAT (Alternate)SHRJ S. NAR/IYANSHRIM. SRIVASTAVA

SHIH S. N. MATHUR (Alternate)SHRI H. N. GUPTA

SHRJ R. P. BllANUSIIALI (Alternate)SHRI M. R. SAMPATH

SIIRf O. N. DAGA (Alternate)DR S. SADULLA

DR G. SWAlVllNATl!AN (Altematc)REPRESENTATlVESHRI P. N. SANK.A.RAN

SUR! V. K. SRIVASTAVA (Alternate)SHRI G. P. YADAV

SHRI N. JAIPAL (Alternate)SIlRI R. K. PODDARDR R. S. RAJAGOPALAN,

Director (Chem)

RepresentingAirport Authority of India (N alional Airport Authority), New DelhiBhabhaAtomic Research Centre, MumbaiMinistry of Petroleum and Natural Gas (Oil Industr ies Safety Directorate), New DeliliNational Safety Council, MumbaiIndian Cotton Mills Federation, MumbaiCentral Leather Research Institute, ChennaiConfederation ofIndi.'1n Industries, New Delhilndian Space Research Organization, ShriharikotaNational Institute ofOccupational Health, AhmadabadLarsen and Toubro Ltd (ECCCol1struction Group), ChennaiDirector General, BIS (Ex-officio Member)

Member-SecretarySl'-H

Documents

Is .3521.1999 Safety Belt,Harness