1. Regulations
  2. title 46
  3. chapter I-i3
  4. part 111
  5. subpart 111.05
  6. § 111.05-31

View all text of Subpart 111.05 [§ 111.05-1 - § 111.05-37]

§ 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 (8.4mm 2).

(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 (mm 2) Size of the system grounding conductor—AWG(mm 2) 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)

AUTHORITY: 46 U.S.C. 3306, 3703; DHS Delegation No. 00170.1, Revision No. 01.2. Section 111.05-20 and Subpart 111.106 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905.

SOURCE: CGD 74-125A, 47 FR 15236, Apr. 8, 1982, unless otherwise noted.

CITE AS: 46 CFR 111.05-31