12 May 2003
Including change 1, 19 January 2007
substations. Provide the number of receptacles required to serve the specific ship types
and classes in accordance with APPENDIX C.
There are currently two types of ships' hotel service receptacles being
used. Many existing facilities utilize a three pole, 500 amp receptacle in accordance
with Mil Spec MIL-C-24368/1. A typical MIL-C, three-pole outlet assembly is illustrated
in Figure D-4. Other facilities utilize a single-pole, 500 amp receptacle, grouped in a
cluster of three. Typical details of the single-pole receptacle system are shown in
Connectors. Cable connectors are available in two types: (1) one single,
multiple conductor type (1-3/c cable); and (2) single conductor type grouped in a cluster
of three (3-1/c cables). A typical three-conductor outlet assembly is illustrated in Figure
D-4. Figure D-1 illustrates the single-conductor type connector.
NOTE: OPNAVINST 11310.0A requires that all low-voltage cables will be terminated
with a MIL-C-24368/1 plug at each end of the cable. However, a waiver to this
requirement has been requested and approved at certain locations by NAVFAC. This
waiver permits the use of single-pole, 500-amp receptacles and single conductor
connectors grouped in a cluster of three. OPNAVINST 11310.3A is being revised to
address this optional connector system.
Primary Outlet Assemblies. Primary voltage outlet assemblies must
have weatherproof, corrosion-resistant enclosures and high voltage connectors.
Connectors must match the standard primary voltage coupler in use by the Activity and
as required by the cognizant NAVFAC EFD/EFA OR USACE DISTRICT. Disconnects
should have an interlocking key which can only be removed when the switch is opened.
Design should be such that, after the disconnect has been opened, the interlocking key
must be used to unlock and make possible the insertion or removal of the
corresponding primary voltage pier coupler plug. Provide 500 amp coupler receptacles
at each 4160 and 13800-volt pier outlet assembly. Incorporate outlet assemblies into
substations as applicable. See Figure D-5 for typical 15 kV details.
Coordination of Shipboard Phase Rotation. Shipboard alternating
current systems have a standard phase rotation. To minimize the phasing procedure
and to reduce the time required to connect shore-to-ship power cables, shore power
connectors should be phased so that they are compatible with the shipboard system.
Refer to NAVSEA 59300-AW-EDG-010/EPISM, Section 2, Group E, Sheets 14 and 15,
to determine phase rotation required for shore power connections.
Conduit Systems. For electrical conduit exposed under or on a pier,
wharf, or drydock, evaluate the relative advantages of Schedule 80 PVC, and
fiberglass-reinforced epoxy conduit. Avoid the use of PVC where they will be exposed
to sunlight and moving objects. Although PVC Coated steel conduits have been used
on many piers, the alternatives are more attractive economically and from a durability
standpoint. The potential exists for loss of integrity of the PVC Coating systems in the
harsh and corrosive environment. Fiberglass cable trays may be used in lieu of conduit