MSHA - Code of Federal Regulations - 30 CFR 18.4
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MSHA - Title 30 CFR
30 CFR § 18.4
Electrical equipment for which approval is issued.

An approval will be issued only for a complete electrical machine or accessory. Only components meeting the requirements of subpart B of this part or those approved under part 7 of this chapter, unless they contain intrinsically safe circuits, shall be included in the assemblies.

For More Information: See MSHA's Program Policy Manual