[Code of Federal Regulations] [Title 46, Volume 4] [Revised as of October 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR111.05-31] [Page 218] TITLE 46--SHIPPING CHAPTER I--COAST GUARD, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 111--ELECTRIC SYSTEMS--GENERAL REQUIREMENTS--Table of Contents Subpart 111.05--Equipment Ground, Ground Detection, and Grounded Systems Sec. 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 Size of parallel generators--AWG-MCM (mm2) the system ------------------------------------------------------------- grounding conductor-- Greater than Less than or equal to AWG(mm2) ------------------------------------------------------------------------ 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) ------------------------------------------------------------------------