{"data":{"id":"us/46-cfr-111.05-31","jurisdiction":"us","citation":"46 CFR 111.05-31","heading":"-31 Grounding conductors for systems.","body":"(a) A conductor for grounding a direct-current system must be the larger of:\n(1) The largest conductor supplying the system; or\n(2) No. 8 AWG (8.4mm 2).\n(b) A conductor for grounding the neutral of an alternating-current system must meet Table 111.05-31(b).\nTable 111.05-31(b)—Neutral Grounding Conductor for Alternating-Current System\nSize of the largest generator cable or equivalent for parallel generators—AWG-MCM (mm2) Size of the system grounding conductor—AWG(mm2)\nGreater than Less than or equal to\n2 (33.6) 8 (8.4)\n2 (33.6) 0 (53.5) 6 (13.3)\n0 (53.5) 3/0 (85.0) 4 (21.2)\n3/0 (85.0) 350 MCM (177) 2 (33.6)\n350 MCM (177) 600 MCM (304) 0 (53.5)\n600 MCM (304) 1100 MCM (557) 2/0 (67.5)\n1100 MCM (557) 3/0 (85.0)","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER J—ELECTRICAL ENGINEERING","PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS","Subpart 111.05—Equipment Ground, Ground Detection, and Grounded Systems"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"c3132372e85bf2df0eee08ca3b02bb603f93bcd14632fa3817fbe9173f159e36","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-111.05-29","next":"us/46-cfr-111.05-33"},"notice":"GroundRules: Original legal text. Not legal advice."}