46 CFR § 111.12-3 - Excitation.

---
identifier: "/us/cfr/t46/s111.12-3"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 111.12-3 - Excitation."
title_number: 46
title_name: "Shipping"
section_number: "111.12-3"
section_name: "Excitation."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "J"
subchapter_name: "ELECTRICAL ENGINEERING"
part_number: "111"
part_name: "ELECTRIC SYSTEMS—GENERAL REQUIREMENTS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
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."
regulatory_source: "CGD 74-125A, 47 FR 15236, Apr. 8, 1982, unless otherwise noted."
cfr_part: "111"
---


# 111.12-3 Excitation.

In general, excitation must meet sections 4-8-3/3.13.2(a), 4-8-5/5.5.1, 4-8-5/5.5.2, and 4-8-5/5.17.5(e) of the ABS Marine Vessel Rules (incorporated by reference; see § 110.10-1 of this subchapter), except that those for mobile offshore drilling units must meet sections 6-1-7/5.17.1 and 6-1-7/5.19.1 of the ABS MOU Rules (incorporated by reference; see § 110.10-1 of this subchapter). In particular, no static exciter may be used for excitation of an emergency generator unless it is provided with a permanent magnet or a residual-magnetism-type exciter that has the capability of voltage build-up after two months of no operation.

[USCG-2020-0075, 88 FR 16360, Mar. 16, 2023]