---
kind: "section"
citation: "46 C.F.R. § 111.70-1"
title: "46"
number: "111.70-1"
heading: "General."
url: "https://uscodex.org/cfr/46/111.70-1"
---

# §111.70-1. General.

- (a) Each motor circuit, controller, and protection must meet the requirements of [sections 4-8-2](/cfr/46/4-8-2.md)/9.17, 4-8-4/9.5 and 4-8-3/5 of ABS Marine Vessel Rules; [sections 6-1-7](/cfr/46/6-1-7.md)/9.9 and 6-1-7/9.15 of the ABS MOU Rules; or IEC 60092-301:1980 (all three standards incorporated by reference; see [46 CFR 110.10-1](/cfr/46/110.10-1.md)), as appropriate, except for the following circuits:
  - (1) Each steering gear motor circuit and protection must meet [part 58](/cfr/46/part58.md), [subpart 58.25](/cfr/46/subpart58.25.md), of this chapter.
  - (2) Each propulsion motor circuit and protection must meet [subpart 111.35](/cfr/46/subpart111.35.md) of this part.
- (b) In ungrounded three-phase alternating current systems, only two motor-running protective devices (overload coil or heater type relay within the motor and controller) need be used in any two ungrounded conductors, except when a wye-delta or a delta-wye transformer is used.
- (c) The motor disconnecting means must be an externally operable switch or circuit breaker.

## Notes

### Amendments

[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 94-108, 61 FR 28281, June 4, 1996; 62 FR 23909, May 1, 1997; USCG-2003-16630, 73 FR 65199, Oct. 31, 2008; USCG-2013-0671, 78 FR 60153, Sept. 30, 2013; USCG-2020-0075, 88 FR 16364, Mar. 16, 2023]

### Authority

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

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

### Amendments

[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 94-108, 61 FR 28281, June 4, 1996; 62 FR 23909, May 1, 1997; USCG-2003-16630, 73 FR 65199, Oct. 31, 2008; USCG-2013-0671, 78 FR 60153, Sept. 30, 2013; USCG-2020-0075, 88 FR 16364, Mar. 16, 2023]