12 May 2003
Including change 1, 19 January 2007
ELECTRICAL SYSTEMS. Electrical power is required on piers, wharves,
and at drydocks for ships services. This includes hotel service (shore-to-ship power),
ship repair (industrial power), ships systems testing, pier weight-handling equipment,
cathodic protection systems, pier lighting, and miscellaneous pier electrical systems.
Materials and installation must conform to the requirements given in MIL-HDBK-1004
series, Electrical Engineering, and in NFPA 70, National Electrical Code. For drydocks,
refer to additional criteria in UFC 4-213-10. Utility data and specialized technical data is
available in Appendix C or it may be obtained directly from NAVFAC CIENG or USACE.
Types of Electrical Services. Design electrical services for piers,
wharves, and drydocks for one of the two types of service listed below, as directed by
the cognizant Engineering Field Division / Activity (EFD / EFA).
Permanent Service. At naval stations, shipyards, repair piers, drydocks,
and other continuously occupied waterfront facilities, provide fixed electrical substations
and associated facilities to accommodate the normal, maximum electrical demand load.
The design may include the use of portable substations as necessary to provide the
peak electrical load that may result from abnormal and unplanned electrical needs. The
electrical design must include: (1) ships power requirements (hotel services) on a
dedicated un-grounded power system; and (2) other facility loads on a separate
grounded power system that includes loads such as lighting, weight-handling
equipment, cranes, pumps, general utilization power, and the industrial power system
(dedicated for ship's repair work while berthed) when required. There are three basic
types of fixed substation installations: (1) the substation is installed on the lower deck of
a double-deck pier; (2) the substation is installed on the pier deck of a single-deck pier
or at grade level adjacent to the pier or associated waterfront facility, and (3) the
substation is installed in an electrical vault located below the pier deck. The vault
system has been used on many existing piers, however it is not recommended for new
installations and requires approval of NAVFAC CIENG or USACE. See Appendix E and
the section entitled "Substations" for additional information.
Temporary Service. Provide temporary electrical service at waterfront
facilities not continuously occupied, or at any facility where a substantial portion of the
peak load will be occasional or intermittent. Provide primary feeders and high voltage
outlet assemblies (5kV and 15kV) for connections to portable substations. Examples of
high temporary loads include: (1) power for testing certain ships weapons systems; and
(2) power for testing ships plant nuclear systems. That portion of the load serving basic
pier, wharf, or drydock functions (lighting, weight-handling equipment, and receptacles
not related to ship service or repair service) must be fed from the permanent service.
Primary Power System. The primary distribution system on the pier or
other waterfront facility normally operates in the medium-voltage range between 5 kV
and 35kV and will depend upon the shore-side utility voltage(s) available. The shore-
side utility system is normally already in existence. It may have to be expanded or
upgraded to support a new or increased capacity pier, but will rarely require a
completely new electrical utility service point. Upgrades to the system should provide
the pier with a dedicated normal circuit and provisions for switching to a backup circuit.