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Code of Federal Regulations (Last Updated: May 6, 2024) |
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Title 46 - Shipping |
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Chapter I - Coast Guard, Department of Homeland Security |
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SubChapter J - Electrical Engineering |
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Part 111 - Electric Systems - General Requirements |
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Subpart 111.05 - Equipment Ground, Ground Detection, and Grounded Systems |
§ 111.05-31 - Grounding conductors for systems.
Latest version.
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§ 111.05-31 Grounding conductors for systems.
(a) A conductor for grounding a direct-current system must be the larger of:
(1) The largest conductor supplying the system; or
(2) No. 8 AWG (8.4mm2).
(b) A conductor for grounding the neutral of an alternating-current system must meet Table 111.05-31(b).
Table 111.05-31(b) - Neutral Grounding Conductor for Alternating-Current System
Size of the largest generator cable or equivalent for parallel generators - AWG-MCM (mm2) Size of the system grounding conductor - AWG(mm2) Greater than Less than or equal to 2 (33.6) 8 (8.4) 2 (33.6) 0 (53.5) 6 (13.3) 0 (53.5) 3/0 (85.0) 4 (21.2) 3/0 (85.0) 350 MCM (177) 2 (33.6) 350 MCM (177) 600 MCM (304) 0 (53.5) 600 MCM (304) 1100 MCM (557) 2/0 (67.5) 1100 MCM (557) 3/0 (85.0)