§111.30-27. Direct current ship's service switchboards.
46 C.F.R. § 111.30-27
Each direct current ship's service switchboard must have the equipment required by paragraphs (b) through (f) of this section.
For each connected generator, each switchboard must have the following:
A circuit breaker that meets § 111.12-11 and § 111.50-5.
A disconnect switch or link for each generator conductor, except a switchboard having a draw-out or plug-in type generator circuit breaker that disconnects—
Each conductor; or
If there is a switch in the generator neutral, each ungrounded conductor.
A field rheostat.
An indicator light connected between the generator and circuit breaker.
For each two-wire generator, each switchboard must have:
An ammeter; and
A voltmeter with a selector switch that connects the voltmeter to show—
Generator voltage; and
Bus voltage.
For each three-wire generator, each switchboard must have the following:
An ammeter for—
The positive lead; and
The negative lead.
A center zero type ammeter for the neutral ground connection.
A voltmeter with a selector switch that connects the voltmeter to show generator and bus voltage—
Positive to negative;
Positive to neutral; and
Neutral to negative.
Each switchboard must have ground detection that meets subpart 111.05 for the:
Main power system;
Main lighting system; and
Emergency lighting system.
For each shore power connection, each switchboard must have:
A circuit breaker or fused switch; and
A pilot light connected to the shore side.
For each two-wire system, shore connection voltage; and
For each three-wire system, shore connection voltage—
Positive to negative;
Positive to neutral; and
Neutral to negative.
Notes, amendments, and revision history
Amendments
[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by USCG-2020-0075, 88 FR 16361, Mar. 16, 2023]
Authority
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
Source: CGD 74-125A, 47 FR 15236, Apr. 8, 1982, unless otherwise noted.
Amendments
[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by USCG-2020-0075, 88 FR 16361, Mar. 16, 2023]