---
kind: "section"
citation: "46 C.F.R. § 169.688"
title: "46"
number: "169.688"
heading: "Power supply."
url: "https://uscodex.org/cfr/46/169.688"
---

# §169.688. Power supply.

- (a) The requirements of this section apply in lieu of [subpart 111.10](/cfr/46/subpart111.10.md) of this chapter.
- (b) If a generator is used to provide electric power for any vital system listed in [§ 169.642](/cfr/46/169.642.md) of this subchapter, at least two generating sets must be provided. At least one required generating set must be independent of the auxiliary propulsion machinery. A generator that is not independent of the auxiliary propulsion plant must meet the requirements of [§ 111.10-4(c)](/cfr/46/111.10-4.md?p=c) of this chapter. With any one generating set stopped, the remaining set(s) must provide the power necessary for each of the following:
  - (1) Normal at sea load plus starting of the largest vital system load that can be started automatically or started from a space remote from the main distribution panel (switchboard).
  - (2) **All vital systems simultaneously with nonvital loads secured.**
- (c) The adequacy of ship service generators must be demonstrated to the satisfaction of the OCMI during the initial inspection required by [§ 169.221](/cfr/46/169.221.md) of this subchapter.

## Notes

### Authority

Authority: 33 U.S.C. 1321(j); 46 U.S.C. 3306, 6101; Pub. L. 103-206, 107 Stat. 2439; E.O. 11735, 38 FR 21243, 3 CFR, 1971-1975 Comp., p. 793; DHS Delegation 00170.1, Revision No. 01.4; § 169.117 also issued under the authority of 44 U.S.C. 3507.

### Source

Source: CGD 83-005, 51 FR 896, Jan. 9, 1986, unless otherwise noted.