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1、1 Copyright 2007 IEEE. All rights reserved. National Electrical Safety Code Committee, Accredited Standards Committee C2 National Electrical Safety Code Interpretation Section 41. Supply and communication systemsRules for employers Rule 410A3 General requirementsGeneral (2007 Edition, page 246) (24
2、January 2007) IR544 Is cotton that is blended with nylon, rayon, or the like acceptable as long as it is treated? Or does the ruling apply to any percentage of these man-made materials? Discussion: A recent article reports that this new rule states: “clothing made of rayon, nylon, polyester, and ace
3、tate shall not be worn at any time.” How does this rule apply to a laundry service that wants to provide people with shirts that have the proper FR rating but are dealing with a material that contains 12% nylon, 88% cotton? Is it true that this new ruling would not apply to the shirts of this partic
4、ular material if the nylon is on the outside of the shirts, which are also specially treated to bring the FR rating up? The shirts do not appear to be “lined” and are probably a blend but the way this rule can be interpreted, neither would be acceptable. Further clarification of this rule is request
5、ed. The goal is for people wearing the shirts to be as safe as possible and, to this end, interpretation of the rule is required. Any help in addressing this issue is certainly appreciated. Interpretation The Interpretations Subcommittee has considered the subject Interpretation Request for Rule 410
6、A3 and has developed a consensus report as follows: “Rule 410A3 does not prohibit blended flame resistant (FR) clothing that otherwise meets the requirements of this rule. The current FR clothing market provides several blended materials that are fully acceptable, including some that are not conside
7、red to be traditional FR materials. The intent of this rule, as stated in the first paragraph, is to require “clothing or a clothing system that has an effective arc rating” Blended clothing may be used if it has an acceptable effective arc rating or arc thermal performance value.” National Electric
8、al Safety Code and NESC are both registered trademarks and service marks of the Institute of Electrical and Electronics Engineers, Inc. The NESC is available from the Institute of Electrical and Electronics Engineers, Inc., 445 Hoes Lane, Piscataway, NJ 08854, USA (http:/standards.ieee.org/). Copyri
9、ght The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:18:45 MDTNo reproduction or networking permitted without license from IHS -,-,- NATIONAL ELECTRICAL SAFETY CODEINTER
10、PRETATION 2 Copyright 2007 IEEE. All rights reserved. The following comments provide additional information and are not part of the official interpretation: 1.While Rule 410A3 is intended to harmonize with current OSHA requirements, this rule also covers performance requirements for clothing exposed
11、 to electric arcs. 2.OSHA explains its intent to prohibit certain fabrics in 29 CFR 1910.269, paragraph (1) (6) (3) NOTE. The listed fabrics are not acceptable unless they are treated to withstand encountered conditions, or unless the user can demonstrate that garments made of the fabric are worn in
12、 such a manner to eliminate the flame and electric arc hazards. While rayon is included in the list of prohibited materials, OSHA recently proposed a revision to the regulation that would remove rayon because of its current widespread use in FR fabrics. 3.The procedures governing NESC Interpretation
13、s do not allow the subcommittee to comment on whether specific fabric blends meet the intended requirements. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:18:45 MDTNo reproduction or networking permitted without license from IHS -,-,-