CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER J—ELECTRICAL ENGINEERING (parts 110 to 113) > PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS > SUBPART 111.05—Equipment Ground, Ground Detection, and Grounded Systems (§111.05-1 to §111.05-37) > 111.05-21—Ground detection.

111.05-21—Ground detection.

There must be ground detection for each:
(a) Electric propulsion system;
(b) Ship's service power system;
(c) Lighting system; and
(d) Power or lighting distribution system that is isolated from the ship's service power and lighting system by transformers, motor generator sets, or other devices.