If transformers are used to supply the ship's service distribution system required by this subpart for ships and mobile offshore drilling units, there must be at least two installed, independent power transformers. With the largest transformer out of service, the capacity of the remaining units must be sufficient to supply the ship service loads.
Note to § 111.10-9:
A ship's service supply system would consist of transformers, overcurrent protection devices, and cables, and would normally be located in the system between a medium voltage bus and a low voltage ship's service switchboard. It is not the intent, nor is it required, that transformers fed by the ship's service switchboard, such as 480/120 transformers, be duplicated.
[CGD 94-108, 61 FR 28277, June 4, 1996; 61 FR 33045, June 26, 1996; USCG-2020-0075, 88 FR 16360, Mar. 16, 2023]
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 111.10-9