Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 3521 (1999): Industrial safety belts and harnesses -Specification [CHD 8: Occupational Safety, Health andChemical Hazards]

IS 3521 : 1999(Reaffirmed 2002)

'J.f7 '? rf} 2/ J17 91Cf)

~ WaiT tr¢ q~ q)Cfq-~

(d)'ff'</ TRTefCTT)

Indian Standard

INDUSTRIAL SAFETY BELTS AND HARNESSES ­SPECIFICATION( Third Revision)

First Reprint JULY 2008(Including Amendment No. I & 2)

ICS 13.340.99

co BIS 1999

BUREAU OF IND.IAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

April 1999 Price Group 6

AMENDMENT NO. 1 MAY 2003TO

IS 3521: 1999 INDUSTRIAL SAFETY BELTS ANDHARNESSES - SPECIFICATION

( Third Revision )

( Page J, clause 2 ) - Substitute 'IS 3203 : 1982 Methods of testing localthickness of electroplated coating (first revision)' for 'IS 4171 : 1983 Copperrods and bars for general engineering purposes (first revision )' .

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

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

( Page 3, clause 5.2.5. Line 12 ) - Substitute 'IS 3203' for 'IS 4171 '.

( Page 8, clause 8·2, Title) - Substitute the following for the existing:

'B-2 TESTS FOR 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 ) - Substitute the existing table with the following:

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

SINo.(I)

i)ii)hi)

Class

(2)

DEL

Distance in m, Max(3)1.80.60.6

( Page 9, clause B·3, Title ) - Substitute 'CLASS pt for 'TYPE 4LINEMANPOLESAFETY BELT t

•

Amend No.1 to IS 3521 : ]999

( Page 9, clause B-3.1 ) - Substitute the following tor 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 work 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 deterioration.'

2

AMENDMENT NO.2 AU(;UST 2007TO

IS 3521 : 1999 INDlJSTRIAL SAFErrV BELTS ANDHARNESS~=S - SP~~CI~-'ICA"rI()N

( ll1ird Revision )

(Page 2, clause 5.1, para 1) --- Substitute the following tor the existing;t:

:,e minimum width of all straps shall be 40 111m except shoulder retainingap, which shall be of 1l1inimUITI width of 20 ITIm.'

(Page 8, Table 2, clause reference) - Substitute "Clause B-2.'" for'auses B-2.1 and D-4'

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

(Page 10, clause 0-4) - Substitute the foJlowing for the existing text:

Fit the articulated human dummy with the harness equipped with lanyardand without an energy absorber.

Suspend the dummy by its upper attachment point and raise to an extentthat the total free fall shalJ be of 4 In and the maximum horizontal distancefrom the central line shall be 300 mrn. Hold it with the quick release device.

Release the dummy without initial velocity, the feet first free fall 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.

lJsing same rope, repeat the test procedure within 15 ~ J min suspendedfrom its lower attachment point and achieve a head first free-fall of 4 In. '

-ro 8)

Industrial Safety Sectional Committee, CHD 8

FOREWORD

This 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 ~~d 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, and

b) 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.

Equipment complying with this standard should satisfy ergonomic requirements and should 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',ISOIDIS 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 complied 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 value in this standard.

IS 3521 : 1999

Indian Standard

INDUSTRIAL SAFETY BELTS AND HARNESSES ­SPECIFICATION( Third Revision)

IS No.4171 : 1983

1 SCOPE

1.1 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) Working 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, windowcleaning,chimney cleaning, etc; and

f) Repairs of:

i) Mineshafts, headgears and other placesloca¥ at higher elevations.

ii) Open-cast mines, quarries, etc.

1.2 This standard also prescribes methodsof samplingand test for industrial safety belts and harnesses.

2 REFERENCES

The 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 are encouraged to investigate thepossibility of applying the most recent editions of thestandards: .

TItleCopper rods and bars for generalengineering purposes (first revision)

4905 : 1968 Methods for random sampling

3 TERMINOLOGY

For the purpose of this standard, the followingdefinitions shall apply ..

3.1 Safety Belt

The equipment which provides protection and safetyin situations given in 1.1 generally, and includes allcomponents/fittings required for its use.

NOTE- Fig. 1shown is for guidance only.

3.2 Waist Belt

That part of the safety belt or harness which is fastenedround the waist.

3.3 Pole Strap

The part of the safety belt for electricians which isfastened round a pole or similar structure.

3.4 Pole Belt

The combination of the waist belt and pole strap asused by electricians.

3.5 Safety Harness

The 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 Lanyard

Theline, which is generally used for connecting thesafety belts or safety harness to an anchorage point.

3.7 .Life Line

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

397(Part 1) ~ 1972

Title ";1

Methods of sampling and test forpaints. varnishes and relatedproducts, Part 3 Tests for paint filmformation, Section 2 Film thickness(third revision)Methodfor statisticalqualitycontrolduring production : Part 1 COQ~ol

chart for variables (first revision)

The line, which provides linear communicationbetween the user and the rescue party at the remotedistance by tension or other means, particularly in anenclosed space.

3.8 Load Bearing Components

All parts and components of safety belts or safetyharnesses and also of safety lines which carry load inthe event of an arrested fall, or during the hoisting ofthe user.

-IS3521 : 1999

4 CLASSIFICATION

This standard covers the following types of belts andharnesses.

4.1 All full body harnesses shall be classified asClass A - Fall Arresting.

4.1.1 Class A - Fall Arresting

Class A harnesses are designed to support the bodyduring and after the arrest of a fall.

Class A harnesses shall have one D-ringfor fall arrestattachment affixed to both shoulder straps at the backor at the front.

4.2 Optionally, fu~l body harnesses could be classifiedunderone or moreclasses. The identifications of theseclasses are:

Class 0 - Controlled descentClass E - Confined entry and exit (raising and

lowering)

Class L - Ladderclimbing(frontal attachment)

Class P - Work positioning

4.2.1 Class D - Controlled Descent

Class D harnesses are those which meet the require­ments for Class A harnesses and which are alsodesigned for controlled descent from a height.

Class D harnesses shall have front- or side-mountedD-rings, but they shall not be mountedat waist level.

4.2.2 Class E - Vertical Entry and Exit

Class 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 Climbing

Class L harnesses are those which meet the require­ments for Class A harnesses and which are designedforuse witha fall arrest system mountedon or adjacentto ladders or towers.

Class L harnesses shall have one or two O-ringsattached to the front of the harness.

4.2.4 Class P - Work Positioning

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

2

5 DESIGN AND CONSTRUCTION

Webbing and thread elements shall be made fromsyntheticfibres, havingcharac~stics consis~ntwiththose 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 strapsor similarelements which are placed in the pelvic area and onthe shoulders, for example, as shown in Fig. 1. Thefull body harness shall fit the wearer. Means ofadjustment may also be provided.

The straps shall not migrate from their positions andshall not loosen by themselves.

The harness shall contain the body and shall distributesuitably the 'dynamic fall arrest forces and post-fallarrest suspension forces over the body. The harnessshall notcreate any supplementary risk and shall offeran acceptable degree of comfort.

It shall bepossible to carry out a visual' inspection ofall the components of the harness. If it is dismantled,it shall be impossible to reassemble it incorrectly.

NOTES

1 The fall arrest attachmentelementts) may beplacedin such awayso that during the useof the harness these lie in front of thechest, it 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 shallcarry load in theevent of an arrestedfallor duringthehoistingof the user.

5.1 Width and Strength of the Straps

The minimum width and thickness of webbing forwaist straps shall be 40 mm and 3 mm respectively.

The waist belts shoulder straps, hoisting straps, solestraps and all types of belts and harnesses shall notbreak under a minimum tensile load of 19.6 kN(2 000 kg).

5.2 Materials

5.2.1 Webbing

All 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.hoistingstraps,pole straps and all types of safety belts and harnessesshall be madefrom nylon/polyester webbing. The test .,~

specimen shall be of entire cross section whoseminimum width andthickness should be 40 mm and3 mm respectively.

IS 3521 : 1999

SACK

SHOULDER STRAPS

THIGH STRAPS

BUCKLES

FIG. I EXAMPLE OF HARNESS

FRONT

All the materials used in the production of webbingand ropeshall pass the flammability tests as given inAnnex A.

5.2.2 Threads for Sewing

Threads forsewingthe loadbearing components shallhavesimilarphysical and chemical properties to that

. of the materials beingsewn.Number of stitches shallbe not less than 3 perem and the typeof 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 Rivetsand Washers

All rivetsand washers if used for joining the varioussections shall bemade from copper.

S.2~4 Life Line/Safety Line

Onlynylon. 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 height

The length of lanyard shall not be more than 3 m inlength. subject to the condition that free fall shall notbe more than 1.8m.

3

5.2.4.2 The length of the life line shall be decided asagreed to between the purchaser and the supplier.

5.2.5 Metal Components

All metal components shall be solid or forged in sucha manner that thejoints are not visible and thejoinedpart of the metal does not impair the strength orquality. Thesurface shallbe smooth finished andfreefrom 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 shall be coated bychromium plating, powder coating. The minimumthickness ofchromium plating shallbe8 microns whenmeasured in accordance with the method prescribedin IS 4171 whereas for powdercoating 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 preventlhunage to the webbing, etc.

Hooks, clampsor other fastening andholding devicesshall be of similar quality and properly treated orplated. The designof the hooks shall be self-closingtype lind care shall be taken to ensure that if pressureis exerted accidentally on the tongue or latch, theyshall not disengage.

IS 3521 : 1999

If 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 ?r to engage.

Aluminium, magnesium or titanium metals or alloysthereof shall not be used.

5.3 Requirements

5.3.1 Strength

Hooks and main load bearing metal parts and fittingsshall not break under the test load of 19.6 kN(2 000 kg). The load shall be applied as closely aspracticable in a manner in which the component isstressed in service.

5.3.2 Attachment Means

In order to avoid that a parson attaches a sub­connecting system to an incorrect attachment 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 Performance tests

The attachment of metal parts, load bearingcomponents and the making of splicesand 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 Load

The 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 winch areenough.

5.3.4 Dynamic Load

The effect of the velocity of the test discovery at theend of free fallon the performance of the harness andthe effect on the shape of the test dummy, shall becarried out as .per the method given in Annex D.

6 SAMPLING

The method of drawing samples of harnesses andstraps from a lot shall beas given in Annex E.

7 INSTRUCTIONS FOR GENERAL USE,MARKING,PACKAGINGANDMAINTENANCE

7.1 Instructions for General Use

Clear instructions in the appropriate national and

regionallanguage, for fitting,adjustment anduseshallbesupplied witheach harness. Such instructions shallalso include the following information:

a) The name of the manufacturer;

b) Where appropriate, the name and addressof the supplier or such other information as •enables the supplier to be traced;

c) A statement of the purposes and Hmitationsof 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 small

· decamenter or that have small or sharp edgeradii;

t) Incaseswhere securing backles (that is, buck­les other than those used primarily for ad­justment of fit) are capable of assembly inmore thanone way; instructions of the methodof assembly by which the harness conforms1<>' this standard and a warning against theuse of any other methods of assembly;

g) A warning against the danger that may ariseby the use of combinations of componentsand/or sub-system in which the safe functionof anyone component and/or sub-systemis affected by or interferes with the safefunction of another;

h) An i.r~truction to make a visual inspectionof the equipment immediately before use andto ensure that the equipment is in a service­able condition and operates correctly;

j) If the product includes any material suscep­tible to attack by chemicals, a correspond­ing warning in general terms together withadvice tothe effect that the user should con­sult the manufacturer in' case' of doubt;

k) If applicable, the conditioning procedures ofthose on which such compliance is based;

m) Storage instructions;

n) Instructions for cleaning and/or washing;

p) Instructions for maintenance;

q) Advice that the equipment be inspected peri­odically, taking account of the conditions ofuse, and at least once a year, by a competentperson according to the manufacturer'sinstructions;

r) A warning that repairs to the equipment becarried out only by the manufacturer or by a 'competent personappropriately authorised by .the manufacturer;

s) Guidance concerning the inspection of the

4 .

equipmentand thosefactors that shouldcausethe 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 Marking

.7.2.1 Marking on Harnesses

Harnesses shall be clearly and indelibly marked orpermanently labelled by any suitable method nothavinga harmfuleffecton materialswith the followinginformation:

a) The type of harnesslbelt:

b) Thename, trade-markor other meansof iden­tification of the manufacturer or the supplierwho is responsible for acting on behalf of the

IS 3521 : 1999

manufacturer 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 materialof construction;

t) Information that states by appropriate meansthe intended purpose of each attachment ele­mentand 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 deviate from the manu­facturer '8 instructions.

7.3 Packaging

Each harness, shall be supplied by wrapping inmoisture-proof material.

ANNEX A(Clause 5.2.1)

FLAMMABILITY RESISTANCE TEST

A-I GENERAL

A-I.I This is a small-scale laboratory screeningprocedure for comparing the relative burningbehaviour of vertically oriented plastic specimensexposed to a low energy level, ignition.

A-l.2 This method of test determines the afterflame/afterglow times and damaged length of specimens. Itis applicable to solid and cellular materials having anapparent density of not less than 250 kg/m", Thismethod is not applicable for materials that spring awayfrom the applied flame without igniting.

A-l.3 The classification system described is intendedfor quality assurance and the preselection ofcomponent materials for products. This system is notintended to assess the fire behaviour of buildingmaterials, furnishings, complete items of equipmentor finished parts.

A·2 OUTLINE OF THE METHOD

A test specimen bar is supported vertically by one endand the free end is exposed to a specified gas flame.

5

The burning behaviour of the bar is assessed bymeasuring the afterflame/ afterglow times.

A-3 SIGNIFICANCE OF 'fEST

A-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 accordancewith this methodshall not beused to describe or appraise the fire hazardpresentedbya particular material or shapeunder actualfire conditions, unless used as one element of a firerisk assessment that takes into account all 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

IS 3521 : 1999

as 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. If the test specimens continueto shrink from the apptied flame without igniting, thesematerials are not suitable for evaluation by this method.of test.

A-3.S The burning behaviour ofsome plastic materialsmay change with time. It is accordingly advisable tomake tests before and after ageing by an appropriateprocedure. The preferred ageing conditions shall be 7days at 70°C. 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

A-4.1 Laboratory Fume Hood (cupboard) having aninside volume of at least 0.5 m' 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 be 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 amount of oxygenavailable in supportcombus­tion is naturally important for the conductof these name tests.Fortestsconducted bythismethodwhenburning timesare pro­tracted chambersizes less than 1 mJ may not provideaccurateresults.

A-4.2 Laboratory Burner - A Bunsen burnerhaving a tube length of 80 to 100 mm and an inside

diameter of 9.4 + 1.6 rnrn The tube shall not be-0.0

equipped with an end-attachment such as a stabilizer.

A-4.3 Ring Stand, with Clamps or the Eqwvalent- adjustable for positioning of the specimen.

A·4.4 Timing Device - accurate to 1 s.

A-4.S Measuring Scale - graduated in mm.

6

A-4.6 Supply ofTecllnical GradeMethaneGas­with regulator and meter for uniform gas flow. Othergas mixtures having a heat content of approximately37 MItm3 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 ± 2°C and a relativehumidity of 65 ± 5 percent.

A-4.9 Complementary Apparatus (see Fig. 2)

A-4.10 Dry Absorbent Surgical Cotton

A-4.H Full-Draught Air-Circulating Oven ­minimum of 25 air changes/hour, capable of beingmaintained at 70 :t: 1°C or other agreed temperature.

n....... _..

SPECIMEN

20

8 RNER

300r-/ ..J / ..

CQTTON,

FIG. 2 VERTICAL BURNING-BEHAVIOUR

TEST ApPARATUS

A-S SPECIMENS

A-S.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 transfermoulded to the necessary form. After any cuttingoperation. care shall be taken to remove all dust andany particles from the surface, cut edges shall have asmooth finish.

A..5.2 Standard bar specimen shall be 125 ± S mrn. long, 13.0 ± O.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 test report.

NOTE- Test! madeon specimens of differentthicknesses ordensity arenotcomparable andtestsmade indifferent directionsof anisotropy mayalsonotbecomparable.

A-S.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 CONDITIONING

A-6.1 Unless otherwise required by the materialspecification, the following shall apply.

A-6.1.1 Two sets of 5 bar specimens shall bepreconditionedfor at least48 h at 27 ± 2°C and 65 ± 5percent relative humidity.

A-6.1.2 Two sets of 5 bar specimens shall bepreconditioned for 168h at 70 ± 1°Cand 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 standardlaboratoryatmosphereof 27 ± 2°C and 65 ± 5 percentrelative humidity.

A-7 PROCEDURE

A-7.1 Clamp the specimen from the upper 6 nun 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 50 mm) thinned to a maximum uncom­pressed 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 yellowtip disappears. Measure the height of the flame againand adjust it if necessary.

A-7.3 Place the flame of the burner centrally underthe specimen, so that the top of the burner is 10 mmbelow the lower end of the. specimen, and allow it toremain there for lOs. Withdraw the burner to adistance at least 150 rom away and simultaneouslystart the timing device. Note the afterflame time 11 inseconds. If 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 mmdistanceshall be maintainedbetween the major portionof the specimen and the tilted burner.

7

IS 3521 : 1999

A-7.4 When afterflaming of the specimen ceases,immediately place the flame of burner again under thespecimen. After lOs tum 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-8 EXPRESSION OF RESULTS

A-S.t Calculate the total afterflame timer, in seconds,for an individual specimen, using the formula:

where

t1 = first afterflame time, in seconds;t2 = second afterflame time, in seconds; andi = specimen number.

A- 8.2 For each set of five specimens from a givenpreconditioning treatment, calculate the total setafterflame time frs' in seconds, using the formula:

;=5

Lt;:;;} fi

where i and If! are as defined in A-8.!

A-8.3 Calculate the combustion time lei in seconds,for an individual specimen, using the formula:

where

i and t2 are as defined in A-8.1; andt3

= afterglow time, in seconds.

A-9 CATAGORIES OF BURNING BEHAVIOUR

The behaviour of the specimens shall be classified inone of thecategories given in Table 1 (FV =Flamingvertical specimen) determined by selecting theappropriate column, using test results to answer theconditional questions posed.

A-10 TEST REPORT

The test~port shall include the following particulars:

a) Complete identificationof the product tested,including 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) Anyprior treatment before testing,other than

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

designation specified in A-9.

IS 3521 : 1999

18ble 1 Categories of Buming Behaviour(Clause A-9) ,

51No.

Conditions Cateaory(II' Note 1)

,--(I) (2) (3) (4) (~) (6)i) If: Anyindividual specimentotalafterf1arnctli SIO s :S30 s S30 s >30sii) And: Totalset afterflametime '« . S50s S2~0 s S250 s >250siii) And: Any individual specimencombustion timeafterthe :S30 s :S60 s :S60 s >60s

secondflameapplication td

iv) And: Afterflame orafterflowing upto thespecimenholdingclamp No No No Yesv) And: Cottonindicatorignitedby flamingparticlesor drops No No Yes Yes

or Novi) Then: Thecategoryis FV-Q FV-I FV-2 (see Note 2)

NOTES1 Ifonly one specrmenfroma set of five specimensfor a given preconditioning treatmentdoes not comply with the requirements for acategory. another setof fivespecimenssubjected to thesamepreconditioning shallbe tested.Allspecimens fromthesecondset shallcomplywiththeappropriate requirements for thecategory.2 The material maynot be categorizedby this method.

ANNEXB(~lause 5.3.2.1)

PERFORMANCE TEST

B-1 EQUIPMENTCarryout the test usingan articulated anthropometricdummy having a mass of 100 ± 5 kg and an overallheight of 1.6 to 1.8 m with, waist not more than100em circumference. as in Fig. 3.

B-2 TESTS FOR TYPE 1, TYPE 2 AND TYPE 3B-2.1 Attach the safety belts harnesses to be testedtogether with safety line to the dummy exactly as itwould be wornby a humanwearer. Attach freeend ofthesafety linethrough thesafetyhookto a rigidanchorpoint. Raise thedummy in an upright position andholdin such manner that the anchorage and the attachmentpointof thesafety beltareas far as possible in thesamevertical axis. Adjust the position of the dummy so thatwhen the quick release device is operated the dummyis allowed to fall freely. The freefall distance foreachsafety belt will be the same as prescribed in Table 2.Operate thequickrelease deviceandallowthedummyto fall freely. When the dummy has come to rest,examine foranydamage, slippage orotherdeterioration.

B-2.1.1 Retest the same safety beltlharness with thedummy in the same manner with a fall of 1.5 timesthe length of theprevious fallandnotewhether dummyis retained clear of the ground. Examine for anydamage to main load bearingcomponents.

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

SINo.(I)

i)

ii)iii)

Class DIstance ID BUD,MlU(2) (3)

A 1.8o 0.6E 0.6

8

-1---1--175 APPROX

~----1---+-""-- 510 APPROX

SWIVEL JOINT

FLAP HINGE

LAP HINGE

460

L

8-3TESTFORTYPE4LINEMAN POLESAFETYBELT

8-3.1 Attach the pole belt to the dummy exactly as itwould be worn by the worker. Secure pole strapextended to its minimum lengtharound one side of asteellink having a round crosssection ofover20 nun.The link as shown should be secured to a rigidanchorage point horizontally. Hold the dummy inpositionby a quick release device.

IS 3521 : 1999

After the release when the dummy has come to restexamine for any 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 notewhether the dummyis retainedclear of the ground. Examine for anydamage to mainload bearing components.

ANNEX C

(Clause 5.3.3)DETERMINATION OF STATIC LOAD

.C·l OUTLINE OF METHOD

The harness to be tested shall beput on the test weightas though the test weight were a person. Alladjustments shall be made to ensure snug fit of theharness to the test weight.

C-2 PROCEDURE

To each attachment element in turn, apply a load 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 thestudyof the behaviourand movementof the variouscomponentsand theireffect on the physical safety of the user.

ANNEXD(Clause 5.3.4)

DETERMINATION OF DYNAMIC LOAD

Dynamic Testing Drop Distances and Attachment Points for Fall Arresting Harness (Class A)

n-r OUTLINE OF METHOD

When the dynamic performance test applied in tumto each attachment element, that is designed to beusedas part of a complete' fall arrest system in the harness,shall withstand two falls (one 30 cm and the headfirst) withor without deformation but without releasingthe dummy. After each fall the dummy shall be in ahead-up position and the angle between the dummyspineand the vertical shall be maximum of 500. 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 1.0 m,The test lanyard shall be attached to the backD-ring.The 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) For the feet-firsttest, the uppermost inner sur­face of the O-ring shall bepositioned 200 mmbelow the flat end of the neck of the test

, weight. For the head-first test, the D-ringshall first be positioned as in the feet-firsttest and then weight shall be lowered until

~ the lanyard is straight, but without load onthe D-ring and then raised 1.0 m for the drop

test.

c). A new harness shall be submitted for each of

the above tests.

During this test two main questions are:

i) the effect of the velocity of the testdiscovery at the end of the free fall on

the performance of the harness. and

ii) theeffect on theshapeof the test dummy.

IS 3521 : 1999

D-3 APPARATUS

D-3.1 Harness Apparatus

D-3.2 Human Dummy

The human dummy for static and dynamic testing ofrelevantcomponentsand systemsshall conform to the

. dimensions and requirements described at Fig. 3. .

The mass of 100kg should have a tolerance of ±5 andoverall height of 1.6 to 1.8 m with waist not morethan 100 cm circumference.

D-4 PROCEDURE

Attach the harness to be-tested together or with safety

line to the 'dummy exactly as it wouldbeworn 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-I SAMPLING

E-I.l Lot

All the units of product, from those submitted forinspection at one time, produced under reasonablysimilar conditions of manufacture including timematerial and process shall be grou ped together toconstitute a lot.

E-l.2 Samples shall be seleted at random from eachlot separately and tested in order to ascertainconformity to the requirements of this specification.

E-l.3 In order to ensure randomnessof selection, useshall 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).

E-2 SAMPI"TNG OF RAW MATER1AI.,S ANDCOMPONENTS

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 lsee 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 purposeof final inspectiononly small samplesneedbe 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 Wheneverthe 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 rawmaterialsaccordingto test procedurespecifiedin 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 thespecified requirementsaccordingto Table3 if the tests are not destructive andaccording to Table 4 if the tests are.destnrctive. Thesamples for test shall be selected at random. The lotshallbeconsideredsatisfactory if all thesamplessatisfythe requirements of this specification.

IS 3521 : 1999

Table4 SampleSizeof ComponentParts forDestructive Tests

(Clause E·2.3)

Table3 SampleSizeof ComponentParts forNon-destructlve Tests

(Clause B-2.3)

&.3 SCALE OF SAMPLING OF ASSEMBLEDSAFETYBELTS AND STRAPS

E-3.1 For the purpose of performance test theassembled safety belts and straps shall be selected atrandomand shallbein accordancewith col 2 ofTable 5.

E-3.2 All the assemblies selected in E-3.1 shall besubjected to performance test.

Table 5 Sample Size of Assembled Belts andStraps for Performance Test

(Clause E-3.1)

No.of UJI1taIn the Lot

(1)Upto~

26" ISOlSI" 1 000·

1001 and'above

No.of UnitsIn the Lot

(1)Upto2526" 100

101 It 500501 andabove

No.otUnltsin the Sample

(2)S8

1320

No.of Unitsin the Sample

(2)1235

No of AssembledSafety Belts

(1)Up to 2526" 100

101 " 500

Over 500

No. of Belts Selected(or the Test

(2)I24

5

ChairmanSUR) K.C.GUPTA

Membtrs

SHRJ PREM BAWEJA

SHRI B.VUAY KUMAR(Allernatt)

SHRI BKAOWATI PRAsADSHJU SAnsH CHANDER (Alternate)

DR A. K. BORAL

SmuR. SRINIVASAN (Alt,mate)DR D.R.CHAWLA

SHRIM. K. BANERJEE (Alternate)

DIRECTOR(MINES SAFETY)SHRl A.K.RUDRA (AItemate)

SHRl V. K.GaELSHIll M. L. AHuJA (Altemate)

SHRI J. P. GoeNKASHll N. Durrs (Alternate)

SHRIM.KANTSHRJ KIm MARU (Altematt)

SHJUG. S.KAsHYAP

DR V. K.JAlNSHRlK. SENOUPTA (Alternate)

SARIM. K. MALHOTRA

SHRl H.N.MDlASWDR A.S.OUOSHAL

SHRI R.H.BHALEKAR (Alternate)

SHRI A. K.AcHARYA

SHRJ P. K.NAIR (AlternDlt)

SHRlS. K. MUKHElUI

SHIUA.K.GHOSH(Alternate)

ANNEXF

(Foreword)

COMMITTEE COMPOSITION

Industrial Safety Sectional Committee, CHD 8

RepresentingNationalSafetyCouncil,Mumbai

Hindustan Aeronautics Ltd,Bangalore

Employees State InsuranceCorporation,Calcutta

Ministryof Defence(DGQ~), NewDelhi

Department of Industrial Policyand Promotion, NewDelhi

Directorate Generalof MinesSafety, Dhanbad

CentralBoilerBoard,NewDelhi

Mining,Geological andMetallurgical Instituteof India,Calcutta

SafetyAppliances Manufacturers Association, Mumbai

Officeof theDevelopmentCommissioner (S51), NewDelhiStandingCommitteeon SafetyforSteelIndustry, SAIL,Ranchi

DirectorateGeneral,Factory AdviceServicesandLabourInstitute,MumbaiFactoryInspectorate, GovernmentofMaharuhtra, MumbaiChiefControllerofExpl~es, Nagpur

Central Mining Research Institute,Dhanbad

StandingFireAdvisoryCouncil,NewDelhi

( Continued on page 12)

11

IS 3521 : 1999

(ContinM~ from pag« 11)

Members

SHRl L.C. GUPTA

SHRI H.S.RAWAT(Alternate)SHRl S. NARAYAN

SHRJM. SRIVASTAVA

SHIU S. N. MATHUR(AlltmaJe)

SHRI H.N. GUPTA

SHRJR.P.BHANUSHAU(Alternate)SHRI M.R.SAMPATH

SHRl O.N. DAGA(Alttrnatt)

DRS.SADUlLA

OR G. SWAMlNATIlAN (Altemate)

~A11VE

SHRI P.N.SANKARAN

SHRI V. K.SR1VASTA\,'A (Altemale)

SHRJG. P. YADAV

SHRI N. JAlPAL(Alttrnale)

SHRI R. K.PooOAR

DR R.S. RAJAOOPALAN,

Director(Chern)

R~p~sent;ng

AirportAuthority of India(National AirportAuthority), NewDelhi

BhabhaAtomicResearch Centre.MumbaiMinistry ofPetroleum andNaturalGas(OilIndustries SafetyDirectorate), NewOelru

National SafetyCouncil,Mumbai

Indian CottonMillsFederation, Mumbai

Central LeatherResearch Institute, Chennai

Confederation of IndianIndustries, New DelhiIndianSpaceResearchOrganization, Shriharikota

National Instituteof OccupationalHealth,Ahmadabad

LarsenandToubroLtd (ECe ConstructionGroup),ChennaiDirectorGeneral, BIS(Ex-officioMember)

Member-SecretarySHIolJ P.MUt<.HOt'AVH'YAY

Additional Director(Chern),BIS

Personal Protective Equipment(Non-Respiratory) Subcommittee, CHD 8 : 02

ConvenerSHRl M.K.MALHOTRA

Members

SHRJ A. K. ACHARYA

SHRl P.K.NAIR (Alternate)

SHRJ M. HAGRJ

SHRI V.K. JAIN

SHRJ K.S~GUYfA (Alternate)

SHRJM. KANTSHRl1<AMLEsH DAND (Aile mate)

SHRI R.K. KAPOOR

SHRI M. D. JOSEPH(Alternate)

SHRI G.S. KASHYAP

SHRl S.N. MAllfUR

SHltJ A. GHATAK (Altemate)

SHRJ C. PERRE1JlASHRI GAlffAM GUPTA (Alternate)

DRS.RAHl1TDR JOOESHNUHAWAN (Altemate)

Smu JAYAPRAKASU SATHE

SHRI SADANAND SA'TPtITE(Altemale)

SHRJJ. N. SHARMA

DirectorateGeneralFactory AdviceServiceandLabourInstitute,Mumbai

Central Mining Research Institute, Dhanbad

UdyogiMoulders (P)Ltd,CalcuttaStandardCommitteeon Safetyfor Steel Industries,SAIL, Ranchi

SafetyServices, Mumbai

NuclearPowerCorporation, Mumbai

Officeof the Development Commissioner(5SI), NewDelhiOil IndustrySafetyDirectorate. Ministryof Petroleum,Governmentof India

JosephLeslieDragerManufacturer andCompany. Mumbai

National TestHouse,Calcutta

Fabricare PvtLtd,Pune

IndianPetrochemicals Ltd,Vadodara

12

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This Indian Standard has been developed from Doc: No. CHD 8 (784).

Amendments Issued Since Publication

Amendment No. Date of Issue

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