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है”ह”ह

IS 14897 (2000): Glass Bulb Designation System for Lamps -Guide [ETD 23: Electric Lamps and their Auxiliaries]

IS 14897:2000

mma=il a RI-q m - 3TFIII+PWMWW

Indian Standard

GLASS BULB DESIGNATION SYSTEM FORLAMPS — GUIDE

ICS 29.140.20

CJ BIS 2000

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

-

December 2000 Price Group 2

Electric Lamps and their Auxiliaries Sectional Committee, ET 23

FOREWORD;

This Indian Sjandard was adopted by the Bureau of Indian Standards, after the draft finalized by the ElectricLamps and thtir Auxiliaries Sectional Committee had been approved by the Eletrotechnical Division Council.

This standard specifies a system of nomenclature about the designation of the glass bulbs used as envelopes forelectric lamps. The use of such designation is intended to specify the description of the finished lamps towardsits shape.

With several types of shapes being used in the manufacturing of electric lamps, this guide will provide informationand guidance to the bulb manufacturers for proper understanding about the designation of finished lamps inrespect of bulb shape and classification.

—.——

This standard is based on IEC Pub 60887 (1988) ‘Glass bulb designation system for lamps’, issued by theInternational Electrotechnical Commission (IEC).

IS 14897:2000

Indian Standard

GLASS BULB DESIGNATION SYSTEM FORLAMPS — GUIDE

1 SCOPE

This standard describes a system of nomenclature thatprovides designations of the glass bulbs used asenvelopes for electric lamps. The application of suchdesignations is directed towards the descriptions offinished lamps.

2 TERMINOLOGY

2.1 Bulb

The outer envelope of glass or other transparent ortranslucent material enclosing the essential compo-nents of an electric lamp.

2.2 Approximate Reference Line

A construction line transverse to the axis through theneck of the bulb. It defines the approximate positionat which the rim of a cap, such as an Edison screwcap, would meet the neck of a bulb. The sole purposeof the approximate reference line is to aid theestablishment of technical definitions of bulb shapes.This line appears in Fig. 1 and 2 as a C-D line. Nosuch line exists for pressed glass bulbs.

3 BASIC COMPONENTS OF A DESIGNATION

3.1 General

Glass bulbs should be described by a designationconsisting of a sequence of letter and number symbolswithout spaces, as follows:

a) A letter symbol consisting of up to threeletters which describes the bulb shape. Theletter or letters of this symbol may in somecases be a basic shape letter symbol onlyand in other cases it maybe a combination ofa basic shape symbol and a modifier ormodifiers. Basic shapes, modifiers andspecial shapes are deftned in 4.

b) A number symbol which states the major di-ameter (nominal) of the bulb in millimetres.

3.2 Rectangular Bulbs

Rectangular PAR-type glass bulbs should be describedby the letter symbol REC followed by two sets ofnumbers. The first number should designate thedimension of the shorter side; the second number shoulddesignate the dimension of the longer side. Thesenumbers should be separated by the multi-plicationsymbol (X). The dimensions should be in millimetres.

4 BULB SHAPE CLASSIFICATION

4.1 Basic Shapes

The basic shape symbols are listed below. Thedescriptive information used in conjunction with theassociated illustration in Fig. 1 forms the definitionof each shape.

Letter General Explanatory NotesSymbol MeaningA— A bulb shape having a spherical

and section that is joined to theneck by a radius that

a)

b)

c)

has a centre outside thebulbhas a magnitude” greaterthan radius of the sphericalsection.is tangent to both the neckand the curve of thespherical end section,

NOTE — These bulbs do not have anysignificant straight portion between thespherical end and the transitional radiusinto the neck.

B Bulged A bulb in which the curve makingup the major portion of the sideof the bulb has a radius greaterthan one-half the bulb diameterand a centre in the plane of themaximum diameter.This designation also applieswhen tsvo radii are used, one forthe lower part and a larger one forthe upper part (candle type).

C Conical A bulb consisting of a conical ornear-conical end section, which isjoined to the neck by an approxi-mately hemispherical section; ifthe end section is not conical, thecurve making up the majorportion of the side of the bulb hasa centre below the plane of themaximum diameter.

E Elliptical A bulb similar to a “B’ shape buthaving the sides formed by asection of an ellipse.

F Flame A bulb resembling the flame of acandle having irregular flutes onthe sides.

1

IS 14897:2000

Let[er General Explanato~ Notes$wbol kfeaning

G Globular A bulb of essentially sphericalshape.

K -- A bulb which is similar in shapeto an “M’’bulb,except there isaconical transitional section bet-ween the major diameter and theneck rather than a curved section.

M Mushroom A bulb having a sphericallyshaped end section blended, abovethe major diameter, to a smallerradius curve centered on the majordiameter, which blends with a

Letter General Explanatory NotesSymbol Meaning

transition curve of approximatelythe same radius for joining theneck.

P— A bulb having a spherical endsection, and a conical mid-sectionthe sides of which are tangent tothe curve of the spherical section.

R Reflector A bulb that includes a parabolicor elliptical section below themajor diameter designed toreceive a reflective coating so asto direct the beam of light.

Qc’D

I

I

E

A B B

I

c

I

$7I

c DI

F G K M

. . .—

P R s T T

FIG. 1 BASIC BULB SHAPES

2

Let~er General Explanatory Notes$mhol Meaning

S Straight-sided A bulb having a sphericallyshaped end section, a conicallower section and an intermediatecurve joining the two.

A bulb that is mostly cylindricalT Tubular

$c- D

in form.

GST

BT

QI

c D

IS 14897:2000

4.2 Modifiers

The basic shape designations in 4.1 maybe modifiedby the addition, as a suffix, of one of the symbols listedbelow. The descriptive information used in conjunctionwith the associated illustration in Fig. 2, forms thedefinitions of each shape:

CA

QI

I

ci

D

1

GT ED

I

RI

CtD

iCF

Q

I

c D

I

Ps

I

c .— -1

D

,I

TD LT

FIG. 2 MODIFIED 13ULBSHAPES

3

-.. —

QI

c DI

cc

RD

IS 14897:2000

Letter General ExampIes of

S)wzbol Meaning A40dljled Shapes

A

c

D

F

L

s

T

Angular tip CA and BA

Conical section below the CCbulb and above the approxi-mate base line

Dimple pointing inwardsor outwards ED, RD and TD

Flutes which twist around CFthe outside and taper to-wards the type of the bulb

Lens end TL

Tubular neck section below PSthe bulb and above theapproximate base line

Tubular neck top section BT land GST

4.3 Special Shapes

The symbols for special shapes are listed below. Thesedo not follow the rules of a basic shape symbol andmodifier but are already well established references.The descriptive information used in conjunctionwith the associated illustration in Fig. 3, forms thedefinition of each shape:

PAR

Letter GeneralSymbol Meaning

PAR ‘JParabolicaluminizedreflector

REC Rectangular

5 EXAMPLES

A

Explanatory Notes

bulb formed by the sealingtogether during the lampmaking process of a pressedglass parabolic reflector sectionand a pressed glass lens section.The lens section may be eitherplain or configurated.

A “PAR” type bulb with arectangular face.

The following are some typical designations togetherwith their interpretation:

A60 An “A” shape bulb with a nominalmajor diameter of 60 mm.

T38 A tubular bulb, with a nominal tubediameter of 38 mm.

PAR121 A “PAR” shape lamp with anominal major diameter of 121 mm.

1)A]urnini~~ is not the only material foruseasa reflector CO?3thlg.

&6G3I

PAR

—.—_

FIG. 3 SPEICALBULB SHAPES

4

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. ‘Ilk does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Dkector (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed peridlcally; a standard along with amendments is reaffirmed when such review indicates thatno changes are rkeded; if the review indicates that changes are needed, it is taken up for revision. Usersof Indian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of ‘BIS Handbook’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from DOC : No. ET 23 (3957).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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