Standard Interpretations - Table of Contents|
| Standard Number:||1910.178; 1910.178(c)(2)(ii)(a)|
|This letter constitutes OSHA's interpretation only of the requirements discussed and may not be applicable to any situation not delineated within the original correspondence.|
Power-operated industrial trucks shall not be used in atmospheres containing hazardous concentrations of metal dust, including aluminum, magnesium, and their commercial alloys, other metals of similarly hazardous characteristics, or in atmospheres containing carbon black, coal or coke dust except approved power-operated industrial trucks designated as EX may be used in such atmospheres.Paragraph (c)(2)(ii)(a) of §1910.178 was adopted in 1971 under Section 6(a) from §202(a) of NFPA 505-1969, entitled "Powered Industrial Trucks". Section 202(a) of NFPA 505-1969 states:
Power-operated industrial trucks shall not be used in atmospheres containing hazardous concentrations of metal dust, including aluminum, magnesium, and their commercial alloys, other metals of similarly hazardous characteristics, or in atmospheres containing carbon black, coal or coke dust, except approved power-operated industrial trucks designated as EX may be used in such atmospheres subject to special investigation by the authority having jurisdiction. In atmospheres where dust of magnesium, aluminum or aluminum bronze may be present, fuses, switches, motor controllers and circuit breakers of trucks shall have enclosures specifically approved for such locations.The corresponding provision in the most recent version of that national consensus standard (NFPA 505-2002) states as follows:
4.2.5 Class II, Division 1, Group F.Question: Would a violation of the prohibition in 29 CFR 1910.178(c)(2)(ii)(a) against the use of powered industrial trucks not designated EX in atmospheres containing carbon black be de minimis if, as permitted by the current version of the national consensus standard, the carbon black contains eight percent or less volatile material?
22.214.171.124 Approved power-operated industrial trucks designated as Type DX or Type EX (classified for Class II Group F locations) shall be used in either of the following locations:(1) Where Group F dust is in suspension or can be in suspension under normal operating conditions in quantities sufficient to produce explosive or ignitable mixtures[;]126.96.36.199 Class II, Division 1, Group F areas shall include locations containing either of the following:
(2) Where mechanical failure or abnormal operation of machinery or equipment can cause such mixtures to be produced[.]
(1) Carbon black, charcoal, coal, and coke dusts that have more than 8 percent total volatile material [Emphasis added]
(2) Atmospheres containing the dusts described in (1) that are sensitized by other materials so that they present an explosion hazard[.]
|Standard Interpretations - Table of Contents|
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