All external wiring of the electrical system is heavy- 

 duty and is protected from direct water impingement by use 

 of wire runs made of plastic pipe. As much as possible, 

 all external circuit components are tested under pressure 

 in the project's 40, 000 psi pressure pot. All topside connec- 

 tions in the primary operating circuits such as lights, motors, 

 and ballast are made up, spliced, and then potted in plastic, 

 to avoid any water damage or hosing through the splices. 

 Some 98 spare wires are provided for scientific equipment. 

 These wires, because of the need for inter changeability, are 

 provided with rubber high-pressure plug-type connectors 

 that allow rapid assembly and disassembly with a high degree 

 of reliability against pressure failure. 



The heavy current demands of the motor and lighting 

 circuits require that these circuits be controlled via a relay 

 system since the wires which pass through the hull connectors 

 are only capable of carrying a maximum load of 10 amperes. 

 These control relays operate in a pressure- compensated, 

 oil-filled control box located just aft of the conning tower. 



Relay control box 



