46 C.F.R. § 111.05-31 Grounding conductors for systems.
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(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).
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PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.05—Equipment Ground, Ground Detection, and Grounded Systems
§ 111.05-31 Grounding conductors for systems.
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 (mm\2\) Size of the system--------------------------------------------------- grounding Less than or conductor_AWG(mm\2\) Greater than 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)------------------------------------------------------------------------
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