MSHA - Code of Federal Regulations - 30 CFR 57.18020
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MSHA - Title 30 CFR
30 CFR § 57.18020
Working alone.


SURFACE ONLY

No employee shall be assigned, or allowed, or be required to perform work alone in any area where hazardous conditions exist that would endanger his safety unless he can communicate with others, can be heard, or can be seen.