46 C.F.R. § 111.05-25 Ungrounded systems.
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Each ungrounded system must be provided with a suitably sensitive ground detection system located at the respective switchboard which provides continuous indication of circuit status to ground with a provision to momentarily remove the indicating device from the reference ground. [CGD 94–108, 61 FR 28276, June 4, 1996]
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PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.05—Equipment Ground, Ground Detection, and Grounded Systems
§ 111.05-25 Ungrounded systems.
