MSHA - Code of Federal Regulations - 30 CFR 57.12028
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MSHA - Title 30 CFR
30 CFR § 57.12028
Testing grounding systems.

Continuity and resistance of grounding systems shall be tested immediately after installation, repair, and modification; and annually thereafter. A record of the resistance measured during the most recent test shall be made available on a request by the Secretary or his duly authorized representative.

For more information: See MSHA'S Program Policy Manual