This specification covers constant speed, continuous duty direct current (dc) and alternating current (ac) diesel engine generator sets.

Generator sets are of the following types, as specified (see 6.2):

Type I - DC, single engine driven for surface ships.

Type II - AC, single engine driven for surface ships.

Type III - AC, twin engine driven for surface ships.

Type IV - AC, single engine driven for submarines.

Generator sets are furnished to provide one of the following service categories, as specified (see 6.2):

          Ship service - Prime electric power required to power all essential
                          loads and non-essential loads.

          Emergency service - Secondary electric power required for all essential
                               loads in the event of loss of ship service electric
                               power.

          Ship service/emergency service - Sets which are used to provide both
                                            ship service and emergency service.

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 03R42, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.