ELECTRICAL AND ELECTRONIC SYSTEMS 



51 



450 VOlT 

 3 PMA^JE POWER 

 PROM iTAiiiri& 

 /E55 Ei_ 



100 AMP 5QO VOLT 

 3 POLE TR>NiPE.K 

 SWITCH 



L. 



SEA'^AB 



srftOiNc vessel. 

 ShOB€ powe*^ 



CONNt Cl ( OTsI 



UNDERWATtR 

 JUNCTION BOX 

 txFMK BAMK. 

 *iliCjr TO 450A 



I yo KvA 



AICO VOLTi 

 SHORE POWER 



AT SCB.IPPS 



Fig. 30. Sealab II power system, block diagram 



Umbilical-Cord Connections 



The umbilical cord from the support vessel will be a composite bundle of air, gas, and 

 gas-sampling hoses, and power and communication cables. Details of the umbilical cord are 

 contained in Chapter 10. In addition to the power cable in the umbilical cord, a shore power 

 cable shall be provided. 



The cables shall be permanently connected and shall enter the hull through pressure-proof 

 stuffing tubes near the bottom of Sealab. The cables shall extend from the hull penetrations on 

 the exterior of the hull to the top access trunk. Protective guards shall be provided for the ex- 

 terior cable runs. The cable ends terminating inside Sealab shall be sealed to prevent the 

 Sealab atmosphere from escaping through the cable jacket and around the conductors. The 

 cable for supplying power through the umbilical cord shall be Navy type THOF-42. The length 

 shall be as specified in the umbilical-cord specification. 



Shore Power Cable — The cable for supplying power from shore through an underwater 

 transformer shall be Navy type THOF-42. A rod closing type Kellems grip shall be installed 

 on each end of the shore power cable. A waterproof connector shall be installed on the surface 

 end of the cable. The connector shall have a male insert. A mating connector shall be fur- 

 nished to Scripps Institution of Oceanography for installation on shore power supply cable. The 

 connector shall be capable of sealing on a 1.250-in. -diameter cable. Pin connections for cor- 

 rect phase rotation shall also be supplied. 



