30 CFR § 57.4600
Extinguishing equipment.
WELDING/CUTTING/COMPRESSED GASES
(a) When welding, cutting, soldering, thawing, or bending--
(1) With an electric arc or with an open flame where an
electrically conductive extinguishing agent could create an electrical
hazard, a multipurpose dry-chemical fire extinguisher or other extinguisher
with at least a 2-A:10-B:C rating shall be at the worksite.
(2) With an open flame in an area where no electrical
hazard exists, a multipurpose dry-chemical fire extinguisher or equivalent
fire extinguishing equipment for the class of fire hazard present shall be at
the worksite.
(b) Use of halogenated fire extinguishing agents to meet the
requirements of this standard shall be limited to Halon 1211 (CBrClF(sub)2) and
Halon 1301 (CBrF(sub)3). When these agents are used in confined or unventilated
areas, precautions based on the manufacturer's use instructions shall be
taken so that the gases produced by thermal decomposition of the agents are
not inhaled.
