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   [ TOC ] [ Chap I ] [ Chap II ] [ Chap III ] [ Chap IV ] [ Chap V ] [ Appendix ]

The ships service power system on this vessel is designed to provide 120/240V. A.C., 1 phase, 60 cycle power, from two 15 KW generators. Detailed descriptions of the various electrical equipments and electrically driven auxiliaries, and instructions on component parts of the electrical system are contained on plans and in the instruction books as listed in the following pages.

SECTION  II

GENERATING PLANT

The main generating plant consists of two (2) generators, each of which is driven by a diesel engine. The type size, etc. of each of the generators, is as listed below  

For operating instruction, spare parts, etc. see the instruction book on the subject equipment furnished to the vessel. Parallel operation is a method by which certain power requirements can be met through the use of two or more generating plants to supply a common load, which is being controlled through the switchboard. Connection of the power sources is mode so as to electrically perform as a single source of power. Parallel operation requires that the two sources of electrical power must match as to voltage, frequency and number of phases. 

SECTION  III

GENERATOR CONTROL AND DISTRIBUTION SWITCHBOARD

The subject switchboard, which is located in the Engine Room, is of the "Deed-Front" type, containing hinged and removable panels, and is self- supported on a suitable foundation, The switchboard contains circuit breakers, relays, transformers, meters, switches, rheostats, voltage regulators, lights, etc. for controlling the two 15 KW. 120/240 V., 1 phase, 3-wire, 60 cycle A.C. generators and for distributing the power that is required by the various auxiliaries, panels, lighting and miscellaneous equipment. For complete details of the switchboard, and details of component parts, see mfg. drawing #F-714 Sheet 1 & 2. 

SECTION  IV

WIRING INSTALLATION

 The vessel is wired for distribution of the various power and lighting circuits from the following: Generator Control and Distribution Switchboard, Power Distribution Panel. The wiring installation is mode with the following type cables 

        Cable passing through watertight decks, bulkhead, or into watertight enclosures were made tight by the use of terminal tubes that conform to Bureau Drawing 9-S-5010-L Type XXI. 

SECTION V

POWER SYSTEM

The various equipment comprising the auxiliaries will be explained in the following sections. In all cases unless otherwise noted, panels, boxes, etc. have been made from aluminum alloy and painted a haze grey in accordance with Section 91 90- 1 of the Detail Specifications . For drawings covering the Power System, see the following listed plans. 

 DISTRIBUTION PANELS

Various types of drip proof distribution panels are supplied on the power system. The data on these panels is listed below. 

The circuit breakers have various tri- ratings to suit the load requirements of the connected equipment. 

BATTERY

One battery consisting of four (4) type 6V-SBM-130 AH trays connected in series. The battery is primarily used for starting the two motor generators and also supplying 24V supply to 4 ckt. Distr. Box 2-45-2. 

SHORE CONNECTION

Means of connecting the vessels power system to an auxiliary source of power, has been provided by the installation of a shore connection box, rated for 60 A, 120/240V., 3 W. on the starboard side of the Bridge. The Shore Connection Box is permanently connected to a circuit breaker with 75A. trip element on the Ships Service Generator Control and Distribution Switchboard. A pilot light in the switchboard indicates when auxiliary power is being supplied to the circuit breaker.

GALLEY RANGES AND REFRIGERATOR

 One Range is installed in the Galley. The equipment is being supplied from main switchboard LD#P-206. For operation and detailed data on the subject range see instruction book for the vessel. 

AIR CONDITIONING AND VENTILATING

The ventilating system consists of the following fans and motors: 

For further details on the Air Conditioning and Ventilating systems see the following listed drawings: 

For further details on Air Conditioning see Marine Developing Company Drawing furnished to the vessel.

BRIDGE CONTROL PANEL

A Bridge Control Panel is located in the Bridge, and is divided into three (3) sections to obtain a more efficient operation by the personnel assigned to the Bridge. 

The component parts of each section are listed below. 

Section No. 1

• (4) Pushbuttons for controlling Cease-Fire circuits of 81 mm Mortar, 20 mm (port), 20 mm (stbd.) and 40 mm Ckt. "45U" 115V supply. 

Section No. 2 

• (6) Toggle switches for controlling power to Running lights. Masthead light, Anchor light, Magnetic Compass light, Stern light and Beacon Control Panel for Beacon light. (24V supply) Ckt. "RL" and "R-BN" 

Section No. 3 

• (4) Indicating lights being supplied from the Control Instrument Panel which indicates failure on L.O.P. or H.W.T. on Engine #1 or 2 (Ckt. "EC" & "EW" 24V supply). 

• (1) Pushbutton Controlling power for Navigation Horn 24V supply (Ckt. "N H") . 

ENGINE CONTROL PANEL

The Engine Control Panel is located in the after end of the Control Room and contains indicating dials, switches and pushbuttons etc. as listed below. 

• (4) indicator Lights indicating failure on L.O.P. and H.W.T. 

• (2) Lamp & Bell Test Pushbuttons, one for each Engine Alarm System. 

• (1) Toggle Switch for Silence & Bell Test. 

• (2) Desynn indicator. 

• (2) Tack Indicator. 

• (2) Rack Control Delay Indicator Light.

• (2) Isolator Switch. 

SECTION VI

LIGHTING SYSTEM
GENERAL

The Lighting System is served by feeders from the Ships Service Control and Distribution Switchboard and 24V., D.C. Distribution Box #2-36-1. The circuit designation of the feeders and the areas served by each Feeder, are listed below.

MAIN SWITCHBOARD

24V. D.C. DISTRIBUTION BOX

 For drawings covering the Lighting System, see the following listed plans. 

Small bulkhead fixtures with red globes, are installed to provide light in berthing areas and also to provide an illumination that will afford the least practicable interference with dark adapted vision in access channels to topside battle and watch stations. 

NAVIGATION LIGHTS

The Navigation Lights installed on the vessel are. 

• (Port) Side Light (Red) 

• (Stbd.) Side Light (Green) 

• Stern Light (Clear) 

• Masthead Light (Clear) 

• Anchor Light (Clear) 

• Beacon Light (Red) 

• Magnetic Comp. Lt. (Red) 

The system is designed to operate on a normal power supply of 24 volt D.C. The normal supply of 24 volt D.C. is obtained from a 24 volt D.C. Distribution Box 2-36-1 which is fed into the Bridge Control Panel located on the Bridge. The toggle switches to control and operate each navigation light are located in section two of the Bridge Control panel. 

For wiring of the system and location of lights see Smith-Meeker Drawings listed below. 

8" SIGNALING SEARCH LIGHT
(SEMI-FIXED)

An 8" Signaling Searchlight, Carlisle & Finch #97133 shall be installed at the forward outboard corner of the port lookout station. The searchlight shall be energized from a switch and receptacle located near the mounting bracket. An identical mounting bracket, switch and receptacle shall be installed at the starboard lookout station to permit use of the light from either side. Supply from 120/240\/, 3W., Distribution Panel #2-36-3, circuit "SL".