30 CFR § 18.4
Electrical equipment for which approval is issued
July 29, 2020
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.
[57 FR 61209, Dec. 23, 1992]