astm a 10.11

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ANSI A L O . 1 1 47 072LiL50 0000137 5

A N S I @A 1 O . l l - 1 9 8 9Revision of

ANSI A1O.ll-1979

American National Standardfor Construction andDemolition Operations-Personnel and Debris Nets

SecretariatNat iona l Sa fety Coun c i l

Approved April 19, 1989Am er ican Na t iona l S tandards Ins t i t u te , Inc

YRIGHT American National Standards Instituteensed by Information Handling Services

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AmericanNat onal

. A N S I A10.11 87 072LI150 0000138 7

Approval of an Amer ican National Standar d requires verification by ANSI t hat t he re-quire ments for due process, consensus, and othe r criteria for approval have been met bythe s tandards developer.Standard Consensus is established whe n, in the judgment of th e ANSI Board o f Standard s Review,substantial agreement has been reached by directly and ma terially affected interests. Sub -stant ial agreement means much more than a simple majority, but n ot necessarily unanim-ity, Consensus requires that all views and objections be considered, and th at a conc ertedeffort be made toward their resolut ion.The use of American National Standards is completely voluntary: their exis tence does notin any respect preclude anyone, whether he has approved the s tandards or not , from m an-ufacturing, mark eting, purchasing, or using products, processes, or procedur es not con-forming to th e s tandards.The American National Standards Inst i tu te does not develop s tandards and will in no cir-cumstances give an interpretat ion of any American National Standard. Moreover, n o per-son shal l have the right or authori ty to issue an interpretat ion of an Am erican NationalStandard in th e name of the American National Standards Inst i tu te. Requests for in ter-pretat ions should be addressed to the secretariat or sponsor whose name appears on thetitle page of this standard.CAUTION NOTICE: This American National Standard may be revised or withdrawn atany t ime. The procedures of th e American National Standards Inst i tu te require thataction be taken periodically to reaffirm, revise, or withdra w this standard. Purchasersof American National Standards may receive current information on all standards bycalling or writing the Am erican Na tional Standar ds Institute.

I

Published byAmerican National Standards Institute1430 Broadway, New York, New York 10018

Copyright O 1989b y American Nat ional Standards Inst i tu te, IncAll r ights reserved.No part of this publication may be reproduced in any form,in an electronic retrieval system or otherwise, withoutthe prior written permission of the publisher.Printed in the United States of AmericaA 1M889/ 12

? c -.YRIGHT American National Standards Instituteensed by Information Handling Services

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ANSI A L O - L I , 87 0724350 O O O O L 3 7 7 a

@his Foreword is n o t part of American National Standard A1O. l l -1989 . )The first edition of this standard, a revision of part of American National Standard SafetyCode for Building Construction, ANSI A10.2-1944, was approved and published by ANSIunder the title, American National Standard Minimum Requirements for Safety Nets,

ForewordANSI A10.11-1971.The n ext revision was retitled American National Standard Safety Nets Used During Con-struction, Repair and Demolition Operations, and was published in 1979.This edition is based on the comments, the needs, and the technology of the industry andthe user.The stan dard establishes safety requirements f or the selection, installation, and use of per-sonnel and debris nets during construction, repair, and demolition ope rations.This standard is one of a series of safety standards tha t have been formulated by theAccredited S tandards Committee on Safety in Construction and Demolition Operations,A l o .It is expected tha t the standards in the A 10 series will find majo r applications in industryand will serve as guides to contractors, labor, and equipment manufacturers. For theconvenience of users, a list of existing and proposed standa rds in the A10 series for sa fetyrequirements in construction and demolition operations follows.A10.3 Powder-Actuated Fastening SystemsA10.4 Personnel HoistsA10.5 Material HoistsA10.6 DemolitionA10.7 Tran sportatio n, Storage, Handling and Use of Comm ercial Explosives and Agentsin the Construction IndustryA10.8 ScaffoldingA10.9 Concrete and Masonry WorkA1O.10 Tempo rary and Portable Space Heating Devices and Equ ipme nt Used in theConstruction IndustryA10.11 Personnel and Debris Nets Used During Construction, Repair and D emolitionOperationsA1 . 12 Excavation (under development)A10.13 Steel ErectionA10.14 Safety Belts, Harnesses, Lanyards, Lifelines and Drop Lines for Construction andA10.15 DredgingA10.16 Tunnels, Shafts and CaissonsA10.17 Asphalt Pavement ConstructionA10.18 Tempo rary Floo r and Wall Openings, Fla t Roofs, Stairs, Railings and Toebo ardsA10.19 Pile Driving (under developm ent)A10.2 0 Ceramic Tile, Terrazzo and Marble WorkA10.22 Rope-Gu ided and Nonguided Workmens HoistsA10.24 Roofmg (under development)A10.27 Asphalt Mixing Plants for Con struction Projects (under developm ent)A10.28 Suspended Work Platforms for Cranes and DerricksA10.30 Drilled Caissons (under developme nt)A10.3 1 Digger DerricksA10.32 Faii Prevention Systems (under developmen t)A10.33 Minimum Requirements of Safety and Health Programs (under development)A10.34 Public Protection (under development)A l 0.35 High Pressure Hydro Blasting (under development)A10.36 Dry Diamond Saws (under development)

Industrial Use (under development)


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~

ANSI A L O * L L 87 W 0724350 0000340 5 W

One purpo se of these standards is to serve as a guide to gov ernmental autho rities havingjurisdiction over subjects within the scope of the A10 Comm ittee. If these standards areadopted for government use, the reference of other national codes or standards in theindividual volumes may be changed t o refer t o the corresponding regulations of thegovernmental authorities.Ail inquiries requesting interpretation of the language of th e Com mittees approvedAmerican National Standards must be in writing and directed t o the secretariat. TheA10 Comm ittee shall approve the interpretation before a response is sent to theinquirer. (No one but the A 10 Committee is authorized to provide any interpretationof this standard.)The A10 Committee solicits comments on, and criticismsof, the requirements of thestandards, The standards will be revised from time to time to provide for new develop-ments, Suggestions for improvement of this standard are welcome.Ail requests for interpre tation and ali suggestions for improvemen t should be sent toth e A10 Committee, National Safety Council, 444 Nor th Michigan Avenue, Chicago,IL60611.This standard was processed and approved for submittal to ANSI b y AccreditedStandards Committee on Safety in Construction and Demolition Operations, Al o.Committee approval of the standard does n ot necessarily imply th at ail Committeemembers voted for its approval. At the time it approved this standard, the A 10Committee had the following members:Matthew J. B urkart, ChairJim E. Lapping, Vice-ChairPhil Schmidt, SecretaryOrganization Represented Name o f RepresentativeAegis Corporation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Matthew J. BurkartAlliance of American Insurers, . . . . . . . . . . . . . . . . . . . . . . . . . . . Rober t S . GosnellDaniel J. MortensonCampbell G. Dewey (Alt)American Concrete Institut e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peter D. Courtois

S. J. Henry (Alt)American Federation of Labor - Congress ofIndustrial Organizations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Jim E. LappingLeslie Murphy (Ait)American Institute of Architects . . . . . . . . . . . . . . . . . . . . . . . . . . H. W. EisenbergAmerican Institute of Steel Construction . . . . . . . . . . . . . . . . . . . . . Ro n DavisCharles Peshek (Alt)American Insurance Service Group, In c . . . . . . . . . . . . . . . . . . . . . . Michael ShagliaPeter C. Danielson (Alt)American Society of Safety Engineers . . . . . . . . . . . . . . . . . . . . . . . Ernest Jorgenson, JrF. C. Daniels (Alt)Associated Builders and Contracto rs . . . . . . . . . . . . . . . . . . . . . . . . Thomas VorholtTh e Associated General Cont ractors of America Paul A. KingBlack &Veatch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Richard K. KingGary Buffimgton (Alt)Colonnas Shipyard, Inc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oscar F. Smith, IVHarry Huggins (Alt)Cons truction Industry Manufacturers Association . . . . . . . . . . . . . . . . William E. MillerE . I. DuPont DeNemours &Company . . . . . . . . . . . . . . . . . . . . . . . A. D. CobbD. A. Gadd y (Alt)Engineering C ontract ors Association . . . . . . . . . . . . . . . . . . . . . . . . Tom MalloyRichard Chapman (Alt)Human Factors Society . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lewis C. BarbeIndustrial Safety Equipm ent Association . . . . . . . . . . . . . . . . . . . . . Frank E. WilcherCatherine A. M orin (Alt)Institute of Makers of Explosives . . . . . . . . . . . . . . . . . . . . . . . . . . Roger N. PrescottThom as P. D owling (Ait)

. . . . . . . . . . . . . . . . .


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ANSI A L O * L L 89 0724250 0000242 7

Organiza io n Repres entedInternational A ssociation of Bridge, Strucfural and

Name ofRepresentativeOrnam ental Iron Workers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (Representation Vacant)Bernard Puchalski (Alt)International B rotherhood of Electrical Workers . . . . . . . . . . . . . . . . . George E. SmithDick Strombu rg (Alt)International Union of Operation Engineers. . . . . . . . . . . . . . . . . . . . A. Bennett H ill, JrDon Carson (Alt)Laborers International U nion of No rth America . . . . . . . . . . . . . . . . . Vito RussoMechanical Contractors Association of America . . . . . . . . . . . . . . . . . Jack HansmanWilliam C. Aber nafhy (Alt)National Association of Dredging Contractors. . . . . . . . . . . . . . . . . . . Gil MillerNational Association of Governmental Labor Officials, . . . . . . . . . . . . . John BrooksNational Association of Home Builders . . . . . . . . . . . . . . . . . . . . . . Harold E. Van WerdenNational Contractors Association. . . . . . . . . . . . . . . . . . . . . . . . . . Kenneth A. ParadisNational Electrical Contractors Association . . . . . . . . . . . . . . . . . . . . Charles J. HartWilliam J. Normand (Alt)National E rectors Association . . . . . . . . . . . . . . . . . . . . . . . . . . . . William Treharne

S . C. Burkhammer (Alt)National Roofing Co nfractors Association. . . . . . . . . . . . . . . . . . . . . Andrew Johnson iCarl Goo d (Alt)National Safety Council . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Joh n A. GleichmanScaffolding, Shoring and Forming Inst itu te . . . . . . . . . . . . . . . . . . . . Richard C. MocnyJoseph S.Puccinelli (Alt)Sigma Associates, L td . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. J. Scardino, JIDonald J. Godlewski (Alt)Sinco, Inc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Daniel M. PaineDavid Denny (Alt)The Taylor Companies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Randy KruegerLar ry W. Snead (Alt)United Association . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Joe A. AdamUnited Brotherh ood of Carpe nters and Joiners of America . . . . . . . . . . . oseph L. Durst, JIUnited Union Roofers, Waterproofers and Allied Workers. . . . . . . . . . . . obert J. Kru1Joseph A. Wiederkehr (Alt)U.S. Department of t he Army. . . . . . . . . . . . . . . . . . . . . . . . . . . . Michael G. VogtMark A. Peterson (Alt)U.S. Department of Labor -OSHA . . . . . . . . . . . . . . . . . . . . . . . . Roy GurnhamU.S. E nvironmen tal Protection Agency . . . . . . . . . . . . . . . . . . . . . . Anthony D. BrownJam es Makris (Alt)U.S. National Bureau of Standards H. S . L e aWire Rop e Technical Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . John Fer ryZeise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ingo ZeiseZurn Industries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Jeffrey D. Meddin)

. . . . . . . . . . . . . . . . . . . . . . . . .

Subcommittee A10.11, which developed this revision, had the following members:Daniel Paine, Chair Steve CooperCecil EstesRo y GurnhamJames HodgesJeff MeddinAilen NeustaterPhiiiip PedleyGeorge E. Smit hEric WatermanCarl WibleCharles Yancey


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ANSI A L O - 1 1 87 m 0724150 0000142 7

SECTION PAGE1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Contents 1.1 Scope . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . 71.2 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.3 Exceptions ........................... !. . . . . . . . . . . . . . . . . 72. Referenced and Related Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.1 Referenced Stand ard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.2 Related American National Standards . . . . . . . . . . . . . . . . . . . . . . . . . . 73. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Conditions Requiring Nets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 . Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 . DesignofNets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88. Manufacturers Prototyp e Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89. On-the-JobTest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

10. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1011. Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1012. Training. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 3. Care. Maintenance, and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 4. Factors Affecting Net Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

14.1 Sunlight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1114.2 Abrasion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1114.3 Sand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1114.4 Rust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 1 Net-Testing Frame Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Appendix - urvey of Job Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7. Identification of N ets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

14.5 Airborne Contaminants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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ANSI A 1 0 . 1 1 87 W 0724150 0000143 O

American National Standardfor Construction andDemolition Operations -Personnel and Debris Nets

1 . General1.1 Scope. This standard establishes safety require-ments for the selection, installation, and use of person-nel and debris nets during construction, repair, anddemolition operations.1.2 Purpose. The purpose of this standard is to provideminimum design, testing, and use requirements for per-sonnel and debris nets.1.3 Exceptions. The enforcing authority may grantexceptions to the literal requirements of this standardand permit alternative methods, b ut only when it isclearly evident that equivalent safeguards are beingprovided.

2. Referenc ed and Related Standards2.1 Referenced S tandard, This standard is intended t obe used in conjunction with Stan dard Method of Salt-Spray (Fog) Testing, ASTM B 117-85.2.2 Related American National Standards. The follow-ing standards are listed fo r information only, and areno t essential for the completion of th e requirementsof this standard.ANSI A10.4-1981, Safety R equirements fo r Person-nel HoistsANSI A10.5-1981, Safety Requirements fo r MaterialHoistsANSI A10.6-1983, Demolition Operations - afetyRequirementsANSI A10.8-1988, Construction and DemolitionOperations - caffolding- afety Requirements

ANSI A10.9-1983, Construction and DemolitionOperations - Concrete and Masonry Work -Safety RequirementsANSI A92.2-1979, Vehicle-M ounted Elevating andRotatin g Aerial DevicesANSI/ASME A39.1-1987, Safety Requirements forWindow Cleaning (including supplemen ts ANSIIASMEA39.la-1988 and A39.lb-1989)

3. Definitionscompetent person. One who is capable of identifyingexisting and predictable hazards in the surroundings orworking conditions that are hazardous o r dangerous toemployees, and who has authorization to take promptcorrective measures to eliminate them .constru ction proje ct. Any activity involving the c on-struction, alteration, maintenance, or demolition of astructure.debris nef. A net tha t is designed to catch only debris.It m ust be used in conjunction with a personnel net ifthere is any possibility for personnel to fall.natural fiber. A fiber produced by nature, such asmanila, sisal, or hemp.perimeter net system. A system of personnel and debrisnets and their su pports arranged to hold nets o n theedge of a floor, work surface, or structure so that whenthe net is fully impact-loaded, the test weight will notcontact any part of the supporting structure,personnel net. A net that is designed, tested, and in-stalled in accordance with this standard for personnelfall protection.synthetic fiber. A fiber produced artificially by manu-facturing processes, such as nylon, polyprop ylene, orpolyester.

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ANSI A L O - L L 87 0724350 O O O O L 4 4 2AMERICAN NATIONAL STANDARD A1O .ll-1 9894. Conditions Requiring N ets4.1 Personnel nets shall be installed to protec t peopleworking at a height who are not protected by otherfall-protection equipment or working surfaces properlyguarded in compliance with other applicable standards.A com petent person shall examine each potentialfall situation and determine that height above whichfall protection is required.4.2 Neither public tra ffic nor workers shall be per-mitted underneath a work area unless they are pro-tected from falling objects. In cases in which p ersonnelnets are used, they shall be lined with debris nettingwith a mesh of size and strength sufficient to containtool s and m aterials capable of causing injury.

5 . Materials5.1 Materials used for personne l and debris nets ma ybe of natural or synthetic fiber of sufficient size,strength, and number to absorb the drop-test loadsspecified in this standa rd without significant distortionof the net pattern.5.2 Materials used shall be capable of providing theminimum service life required by 13.4.When used incombination, they shall be compatible with each other.5.3 Net hardware shall be drop-forged, pressed, orformed steel, or material of equal or better quality. Sur-faces sha.ll be s mooth and free of sharp edges. All hard-ware shall have a corrosion-resistant finish capab le ofwithstanding a 50-hour salt-spray test in accordancewith ASTM B 117-85.

6. Design of Nets6.1 This standard is not intended to limit net designor co nstruction to specific materials, minimum com po-nent sizes or strengths, or mandatory mesh configura-tions. Rather, manufacturers are encouraged to beinnovative in their designs to meet and exceed the mini-mum performance requirements of this standard.6.2 Personnel nets shall be designed and c onstruc tedto minimize fali-arrest injuries sustained in the cou rseof normal use when installed in accordance with themanufacturers specifications and the requirements ofthis standard. Manufacturers shall pay particular atten-tion to 6.3 through 6.6.6.3 Mesh openings should be small in order t o spreadthe deceleration force through as many net strands as

possible, and t o m inimize entanglement of a fallenpersons head, arms, and legs when a rresting the fall.The maximum size of mesh shall no t exceed 36 squareinches or be longer than 6 inches on any side, measuredcenter-to-center of mesh ropes or webbing. No meshmember shall exceed 6 inches in length measuredcenter-to-center of mesh crossings. All mesh crossingsshall be anchored to eliminate frictional wear and pre-vent enlargement of the mesh openings.6.4 Design, materials, and co nstructio n shaii combineto produce a net tha t wi l i minimize the decelerationand rebound force when arresting a fall.6.5 Net hardware and structural supports shall bedesigned to minimize the possibility of being impactedwhen arresting a fall. They shall be of sufficient sizeand number to absorb the drop-test loads specified inSections 8 and 9 without permanent distortion. Theirdesign shall prevent disengageme nt during normal use .6.6 Debris nets, when used with personnel nets, shallbe secured on top of t he personnel nets. A competentperson shall determine the size, weight, and height-of-fall of anticipated d ebris. The debris netting shall havea mesh of the size and strength sufficient to containthe expected debris without pen etration when prop-erly supported by th e personnel net. The debris netsshall no t compromise the design, construction, o rperformance of the personnel nets.

7 . Identification of NetsEach personnel net shall be perman ently labeled withthe following information:

(1) Name of manufacturer(2) Identification o f net material(3) Date of manufacture(4) Date of prototype test(5) Name of testing agency(6) Serial number

8. Manufacturers Prot otyp e T est8.1 The manufacturer shall certify tha t the pro totypenet is identical in material and construction t o the per-sonnel nets furnished for the jo b and has successfullypassed the q ualification test described in 8.2. The manu-facturer shall maintain the written qualification-testrecords that substantiate the conformance to th e re-quirements of this standard.

8


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ANSI A 1 0 * 1 1 89 = 072q150 0000145 4AMERICAN NATIONAL STANDARD A1O .ll-198 9

12- X 12- in TIMBER(OR EQ UIVALENT) TES T FRAME -AND AT ABOUT 2- ft IO-in INTERVALSON T HE 17-ft LENGTH- LOCATION OF

3/4 - in WIRE ROP E SECURED TOFR AME AT END AND CENTER \

6 f t-/\

24 f t BORDER ROPES LEVEL.NET SAG WHEN HUNG =3 f AT NET CENTER

I

+i!2

I

Figure 1Net-Testing FramePlan

8.2 The impact resistance of the n et shall be such tha tit will absorb three d rops of t he test weight as describedin 8.2.3. There shall be no broken strands or significantdistortion of the net patte rn a t the end of the first orsecond drop. The test procedure shall be as outlined in8.2.1 through 8.2.4.frame as shown in Figure 1. The test frame should pro-vide an opening appropriate for hanging the n et. Theframe shall be elevated sufficiently to prevent the net,when hung, from con tacting any surface below th e netduring the test.

8.2.2 When hung in accordance with 8.2.1, the ne tshall no t sag more th an 3 feet a t its center. The borderrope shall be level.in diameter and no more than 36 inches high, shall bedropped into the n et from a height of 50 feet once ateach of the three points formed b y the intersection ofquarterpoints of the long dimension (6-foot intervals

8.2.1 A 17 - X 24-foot net shall be secured in a

8.2.3 A 350-pound bag of sand, 24 inches f 2 inches

from the end of the net) with the centerpoint of theshort dimension (8-1/2 feet from the side of th e net),as shown in Figure 1.8.2.4 There shall be at least a 5-m inute intervalbetween each test drop t o allow time for net recovery.

9. On-the-JobTest9.1 Individually mounted personnelnets shall be testedon the job in the suspended position immediately fol-lowing initial installation, relocation, or major repair,and, when left in one location, at 6-mon th intervals.9.2 Personnel-net systems composed of two or morenets connected together shall be tested in accordancewith 9.1 and 9.3. The test weight shall be d roppedinto the center of the net th at is considered b y a com-petent person to be the weakest point of the system.The age and condition of each net, and the arrangement

9


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A N S I A 1 O * l 1 1 A7 0724150 000014b bAMERICAN NATIONAL STAND ARD A10.11-1989of the supports, shall be considered when determiningthe weakest point, In cases where reasonable doubtexists, the test drop shall be condu cted at each pointconsidered to be potentially weak.9.3 The test shall consist of dropping into the centerof the net a 400-pound bag of sand not more tha n30 inches tr 2 inches in diameter and no more than36 inches high. A tag line of sufficient str ength shallbe attached t o the test weight to prevent it fromfalling to the surface below should it penetrate thenet. The tag line shall not reduce the imp act of thetest weight into the n et,The weight shall be dropped from a height of 25 feetabove the n et, measured from the bo ttom of the weight(1 0 O00 foot-pounds).9.4 There shall be no significant residual distortion o fthe ne t pattern o r the suspension system.Exception: When the employer can demonstrate thata drop test is not feasible or practical, the n et and thenet installation shall be certified by a competent per-son to be in compliance with all other provisions ofSections 1O, 11, 13, and 14 of this standard.

10. Installation10.1 Nets shall be installed in accordance with t he ne tmanufacturers specifications and instructions. Theuser is responsible for net installation, an d for the de-sign and installation of the net supports,10.2 Nets shall be installed as close unde r the workinglevel as practical, but n ot lower than 30 feet. They shallbe hung w ith sufficient clearance to prevent contactwith the surface of structures below when the usersimpact load testing is applied. There shall be no inter-vening members between the working surface and thenet tha t could be impacted during a fall.10.3 It is intended tha t only one level of nets be re-quired for bridge construction provided that :working surface and the n et th at could be impactedduring a fall.

(2) The net and supp orts will sustain the impact ofa 400-pound bag of sand 30 inches k 2 inches in diam-ete r and no more than 36 inches high, dropped fromthe highest working surface into the lowest point of thenet without permanent distortion of the net pattern orsuspension system.(3) There should be sufficient clearance to ensureagainst contact of the test weight or the net w ith any-thing below.

(1) There are no intervening members between the

10

(4)Where nets are interconnected, th e require-ments of 9.2 shall be applied in lieu of testing eac hnet, provided that no oth er requirements of 10.3 areviolated.Exception:When the employer can demonstrate tha t adrop test is not feasible or practical, the net, and thenet installation, shall be Certified by a comp etent per-son to be in compliance with all other provisions ofSections 10, 11, 1 3,an d 14 of this standard.10.4 When two or more nets are connected to form alarger uni t, the y shall be laced with a lacing materialequal in strength to the mesh rope or webbing. Theresulting openings shall not be larger than the net meshopenings specified in 6.3. Drop-forged safety hook s,shackles, or equivalent m eans may be used in lieu oflacing.10.5 Drop-forged safety hooks, shac kles, or equivalentmeans of fastening that will withstand th e dro p test inSection 9 shall be used to atta ch nets to supportingcables, structures, or beams projecting from structures.The spacing between the fastening devices shall no texceed 4 feet.10.6 For the applicable fall distance, perimeter netsystems shall extend outward horizontally from theoutermost working surface of the structure a distanceequal to or greater than the distance listed in the fol-lowing table :

Vertical Distance from Minimum RequiredWorking Level toHorizontal Plane ofPersonnel NetHorizontal Distance ofOuter Edge of Net fromEdge of Working Surface

(feet) (feet)up to 5 8More than 5 up t o 1 0 10More than 10 13The ne ts shall be installed with sufficient sag and insuch a way as to capture falling personnel or debris andminimize bounce.

10.7 Supports for perimeter nets shall be designed andinstalled so as to preclude their being impacted by fall-ing debris or personnel.

11. Inspection11.1 Personnel and debris nets sh all be inspected b y acompetent person utilizing any inspection instructionssupplied by the manufacturer. T he inspections shallbe conduc ted after each installation and n ot less thanonce each week thereafter. (Additional inspections shallbe made after alterations, repair, and impact loadings.)


7/28/2019 ASTM A 10.11

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7/28/2019 ASTM A 10.11

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ANSI A L O - L L 87 m 0724350 O000348 T m

(This Appendix is not part of American National Standard A1 0.11 -19 89, but is included for informa-Appendix tion only.)Survey of Job Site

Construction and demolition w orkers are subject tocertain hazards tha t cannot be eliminated by mechani-cal means and must be controlled by care, commonsense, and intelligence. The A10 Comm ittee realizesthe importance of safety and strongly recommendstha t, prior t o commencing any operation, the employermake a survey of the conditions of the site to deter-mine the hazards and the kind and number of safe-guards that the e mployer will install. The survey shouldinclude, but n ot be limited to, the following:(i) Safe access and m ovement

(a) Work areas(b) Walkways, runways, and passageways(c) Ladders, stairways, and elevators(d) Protection for floor and roof openings(e) Illumination(a) Roads:(2) Vehicles(i) Turn space(ii) Parking area(iii) M ud areas(b) Materials storage areas and dum p areas(c) Signs and signals to ro ute vehicles on(d) Maintenance and repair of vehicles(a) Location of tem porary buildings(b) Location and identification of high-voltage

the job(3) Utilities and service

lines (identify by signs; move, de-energize, or e rect bar-rier to prevent contac t)drinking water(c) Loca tion of sanitary facilities and

(4) Scheduling work for safety(a) Providing hard h ats, life belts, goggles, work(b) Establishing liaison among contractors to(c) Providing temp orary flooring, safety nets,

vests, and the like, on the jobprevent congestion among tradesand sca ffolding where requ ired(5) Work procedures(a) Space(b) Equi pmen t such as cranes, hoists, elevators,

(c) Rigging procedures( 6 ) Tools and equipment(a) Repair, maintenanc e, and care(b) Inspection(c) Supplies of tools for each jo b(a) Job assignment(b) Training and supervision(c) Numbe r of workers(d) Plans for maintaining interest in safety:

and trucks

(7) Workers and sup ervisors

(i) Safety bulletins, record charts,(ii) Recognition fo r groups or individuals(iii) Investigation and reporting on report-(iv) Knowled ge of safety orders(v) Safety meetings(vi) Specific safety instructions for new

(e) Establishment of provisions to take imm e-(0 First-aid and medical treatment of injuries

and posters

able accidents

employeesdiate action to correct unsafe conditions or acts

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astm a 10.11

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