316 



ENGINEERING EVALUATION 



SHORE POWER 



AT SCRIPPS 



!tl60 VOLTS 3 PHASE 



SUPPORT VESSEL 

 POWER 

 450 VOLTS 3 PHASE 



WATER HEATER 



7.6 KVA 



450 VOLTS 3 PHASE 



I 



UNDERWATER 

 TRANSFORMER BANK 

 4160 TO 450 VOLTS 



I 



LJ 



MAIN POWER 



DISTRIBUTION PANEL 



AND 



TRANSFER SWITCH 



THREE PHASE 



50 VOLTS 100 AMPS 



BASEBOARD HEAT LOAD 



16.7 KVA 

 450 VOLTS 3 PHASE 



ARAWAK UNIT NO. 1 



TWO 1 HP MOTORS 

 450 VOLTS 3 PHASE 



J 



1 



ARAWAK UNIT NO. 2 



TWO 1 HP MOTORS 

 450 VOLTS 3 PHASE 



TRANSFORMER BANK 

 75 KVA 3 PHASE 

 i50 TO 208/120 VOLTS 



POWER AND LIGHTING 

 DISTRIBUTION PANEL 

 120 VOLTS 



I 



POWER AND LIGHTING 

 DISTRIBUTION PANEL 

 120 VOLTS 



POWER 

 DISTRIBUTION PANEL 

 208 VOLTS 



Fig. 123. Sealab II electrical system block diagram 



circuits, while the third panel supplied the 208-volt circuit. Figure 123 is a block diagram of 

 the electrical power distribution system. 



Branch Circuits and Loads —All electrical circuits were controlled and protected by cir- 

 cuit breakers located in the distribution panels. Wiring was installed in accordance with Gen- 

 eral Specifications for Ships of the U.S. Navy, with the use of standard Navy shipboard cable 

 and equipment. The electrical circuits were ungrounded to eliminate shock hazards. Figures 

 124 and 125 show the power and lighting systems. Table 45 shows the total connected load of 

 the electrical power-consuming equipment installed in Sealab II. 



Interior Lighting — The interior lighting fixtures were marine type fixtures using com- 

 mercial 40-; 50-, 75-, or 100-watt lamps (A-19 bulb size). These lamp sizes were all tested 

 to ascertain their ability to withstand pressures twice that equivalent to the water depths of 

 200 ft (approximately 178 psi). All fixtures were controlled by conveniently located toggle 

 switches. A red standing light was installed in the berthing area for low-level lighting. Indi- 

 vidually controlled berth lights were installed for each berth. 



