Ansi a14.3 Escaleras - [PDF Document] (2022)

A N S I ALLi-3 8 4 M 2 5 7 5 5 3 2 OOOB35h h

ANSI A14.3-I984

for ladders fixed safety requirements

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A N S I A14.3 84

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2 5 7 5 5 1 2 0008157 8

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American National Standard

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Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does noi in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard.

CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute.

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Copyright O 1984 by American National Standards Institute, Inc All rights reserved.No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.

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ANSI A34.3 84

2575512 0008358 T

[emailprotected] A 14.3- 1984Revision of ANSI A14.3-1974

American National Standard for Ladders Fixed Safety Requirements

Secretariat

American Ladder Institute

Approved January 13, 1984

American National Standards Institute, I ne

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A N S I A I l l . 3 8 l l W 2 5 7 5 5 1 2 0008159 I W

Foreword (This Foreword is not part of American National Standard ANSI A14.3-1984.)This standard is a revision of American National Standard Safety Requirements for Fixed Ladders, ANSI A14.3-1974. It is one of a series of five standards prepared under the supervision of American National Standards Committee on Safety in the Construction, Care, and Use of Ladders, A14. All five standards have been developed by subcommittees reporting to American National Standards Committee A14. The subcommittees are: A14-1, Portable Wood Ladders; A14-2, Metal Ladders; A14-3, Fixed Ladders; A14-4, Job-Made Ladders; and A14-5, Portable Reinforced Plastic Ladders.Ail five standards derive from the original American National Standard Safety Code for Construction, Care, and Use of Ladders, A14, which was first approved in 1923. Revisions were approved in 1935, 1948, and 1952. Prior to the 1948 revision, the Code contained some treatment of metal and fured ladders. Requirements for these types of ladders were removed from the 1948 revision, which became American National Standard Code for Wood Ladders, ANSI A14.1-1948, because, in the opinion of the committee, the rapid development in the metal ladder field warranted special consideration and treatment of metal ladders and fured ladders (usually metal) in separate standards.

Subcommittee A14-3 was created for the purpose of reviewing the data on fixed ladders originally contained in the Code prior to the 1948 revision, and making any changes or additions necessary to conform to the requirements of all interested groups. The A14.3 standard was submitted to the A14 Committee for letter ballot in December 1955 and was approved in 1956. A revision was published in 1974. The present revision was begun in 1979 and was approved in 1981. However, an appeal led to reconsideration by the A14 Committee, and the current version was finally approved in 1984. Significant changes are in the statement of exceptions to the application of this standard and in the lengths of climbs as covered by this standard. Suggestions for improvement of this standard will be welcome. They should be sent to the American Ladder Institute, 111 East Wacker Drive, Chicago, IL 60601, This standard was processed and approved for submittal to ANSI by American National Standards Committee on Safety in the Construction, Care, and Use of Ladders, A14. Committee approval of the standard does not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the A14 Committee had the foliowing members: Lewis W. Berger, Chairman Norman R. Pugh, SecretaryOrganization Represented Aiance of American insurers. The Aluminum Association Name of Representative.Thomas F. Bresnahan .Edward E. Cooke W.W. Pritsky (Ait) Robert I. Werner (Ait) .Robert H. Lee .David P. JVinger Thomas E. Murray (Ait) .Edward E. Wilkinson .Henry W. Buschman, JI James B. Dorenbusch (Alt) .Robert Sample Arthur L. Schmuhi (Ait) .Paul V. Duffy .Robert Reid .David C. Norman J. P. Markey (Ait) .Gary Redman

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

American Institute of Architects American Insurance Association

.......................... .......................... American iron & Steel Institute. .......................... American Ladder Institute. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Associated General Contractors of America, Inc . . . . . . . . . . . . . . . . .

Association of American Railroads . . . . . . . . . . . . . . . . . . . . . . . . . Canadian Standards Association. . . . . . . . . . . . . . . . . . . . . . . . . . . Edison Electric Institute

............................... Electronic Industries Association ..........................

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Contents

PAGE

1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 Exceptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 Existing Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 Interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 Mandatory and Advisory Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 Equivalent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.10 Recognized Design Practice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 6 6 6 6 6 6 6 7 7 7

2 . Related Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Related American National Standards . . . . . . . . . . .1 . . . . . . . . . . . . . . 7 7 2.2 Other Related Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 4 . General Design Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.1 4.2 4.3 4.4

7

8 Maximum Ladder Lengths and Protection Requirements . . . . . . . . . . . . . . 8 Design Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Design Stresses and Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Design Supervision. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5. Design Details for Fixed Ladders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 StepsandRungs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Side Rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3 Terminations at the Top of a Ladder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6 Moisture Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Design Details for Cages. Wells. and Platforms . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1 Cages. . . . . . . . .

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