Generator, feeder, and bus-tie cables must be selected on the basis of a computed load of not less than the demand load given in Table 111.60-7.
Table 111.60-7 - Demand Loads
| Type of circuit | Demand load |
|---|---|
| Generator cables | 115 percent of continuous generator rating. |
| Switchboard bus-tie, except ship's service to emergency switchboard bus-tie | 75 percent of generating capacity of the larger switchboard. |
| Emergency switchboard bus-tie | 115 percent of continuous rating of emergency generator. |
| Motor feeders | Article 430, NFPA NEC 2002 (incorporated by reference; see 46 CFR 110.10-1). |
| Galley equipment feeder | 100 percent of either the first 50 KW or one-half the connected load, whichever is the larger, plus 65 percent of the remaining connected load, plus 50 percent of the rating of the spare switches or circuit breakers on the distribution panel. |
| Lighting feeder | 100 percent of the connected load plus the average active circuit load for the spare switches or circuit breakers on the distribution panels. |
| Grounded neutral of a dual voltage feeder | 100 percent of the capacity of the ungrounded conductors when grounded neutral is not protected by a circuit breaker overcurrent trip, or not less than 50 percent of the capacity of the ungrounded conductors when the grounded neutral is protected by a circuit breaker overcurrent trip or overcurrent alarm. |
[CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by USCG-2004-18884, 69 FR 58348, Sept. 30, 2004; USCG-2003-16630, 73 FR 65198, Oct. 31, 2008]