46 CFR § 129.315 - Power sources for OSVs.
---
identifier: "/us/cfr/t46/s129.315"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 129.315 - Power sources for OSVs."
title_number: 46
title_name: "Shipping"
section_number: "129.315"
section_name: "Power sources for OSVs."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "L"
subchapter_name: "OFFSHORE SUPPLY VESSELS"
part_number: "129"
part_name: "ELECTRICAL INSTALLATIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 3306; sec. 617, Pub. L. 111-281, 124 Stat. 2905; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 82-004 and CGD 86-074, 62 FR 49332, Sept. 19, 1997, unless otherwise noted."
cfr_part: "129"
---
# 129.315 Power sources for OSVs.
(a) The requirements of this section apply to OSVs between 100 GRT and 500 GRT or less than 6,000 GT ITC instead of those in subpart 111.10 of this chapter.
(b) If a generator provides electrical power for any system identified as a vital system by § 128.130(a) of this subchapter, at least two power-generating sets must be provided. At least one set must be independent of the main propulsion plant. A generator not independent of the main propulsion plant must comply with § 111.10-4(d) of this chapter. With any one generating set stopped, the remaining set or sets must provide the power necessary for the loads required by this section.
[CGD 82-004 and CGD 86-074, 62 FR 49332, Sept. 19, 1997, as amended by USCG-2012-0208, 79 FR 48937, Aug. 18, 2014]