46 CFR 111.10-9
§ 111.10-9 Ship's service supply transformers; two required.
United States · 46 CFR — Shipping · Status: effective
Cite this
- Citation
- 46 CFR 111.10-9, § 111.10-9 Ship's service supply transformers; two required, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/227019
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Full text
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.
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.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.