MSHA - Code of Federal Regulations - 30 CFR 18.49
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MSHA - Title 30 CFR
30 CFR § 18.49
Connection boxes on machines.

Connection boxes used to facilitate replacement of cables or machine components shall be explosion-proof. Portable-cable terminals on cable reels need not be in explosion-proof enclosures provided that connections are well made, adequately insulated, protected from damage by location, and securely clamped to prevent mechanical strain on the connections.