MSHA - Code of Federal Regulations - 30 CFR 77.513
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MSHA - Title 30 CFR
30 CFR § 77.513
Insulating mats at power switches.

Dry wooden platforms, insulating mats, or other electrically nonconductive material shall be kept in place at all switchboards and power-control switches where shock hazards exist. However, metal plates on which a person normally would stand and which are kept at the same potential as the grounded, metal, non-current-carrying parts of the power switches to be operated may be used.