MSHA - Code of Federal Regulations - 30 CFR 19.8
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MSHA - Title 30 CFR
30 CFR § 19.8
Protection against bodily hazard.

This hazard is chiefly due to the possible burning of the wearer by electrolyte spilled from the battery. MSHA therefore requires that:

(a) Spilling of electrolyte. The lamp shall be so designed and constructed that, when properly filled, the battery will neither leak nor spill electrolyte under actual service conditions. Lamps passing a laboratory spilling test will be considered satisfactory in this respect, contingent upon satisfactory performance in service.

(b) Corrosion of battery container. The material of which the container is made shall resist corrosion under conditions of use.