ELECTRICAL AND ELECTRONIC SYSTEMS 



55 



detail design. The transfer-switch breakers shall be 100 amp capacity. The power-distribution 

 breakers shall be selected to protect the load served. At the option of the design activity, the 

 transfer switch and the 450-volt, 3-phase distribution panel may be in separate enclosures. 



Power and Lighting Distribution Panels - The 115-volt power and lighting distribution 

 panels shall be similar to totally enclosed type Symbol 994.3, 995.3, or 999.3 listed in NavShips 

 250-560-3. The number and size of the panels required shall be determined in the detail de- 

 sign. The rating of the circuit breakers shall be selected to protect the load served. 



Cable — The cable for the electrical system shall be type SGA of MIL-C-2194 and/or types 

 covered in MIL-C-915. 



Stuffing Tubes — Stuffing tubes shall be standard Navy stuffing tubes listed in NavShips 

 250-560-3. Pressure-proof type shall be similar to tubes shown on BuShips Dwg. 815-1197030. 



Interior Receptacle — The double receptacles installed throughout the vessel shall be 

 grounded type and shall be Symbol 730.1 (commercial) listed in NavShips 250-560-3. Where 

 receptacles controlled by a switch are required, Symbol 900.1 of NavShips 250-560-3 shall be 

 used. Commercial plugmold or similar may be used in the lab space, providing provisions of 

 Note 7 of BuShips Dwg. 9000 S6202 73980, Section 3, Sheet 57 are met. 



Waterproof Connectors — Waterproof connectors shall be any suitable commercial or Navy 

 type. The following companies manufacture waterproof connectors: 



Cannon Electric Company, Los Angeles, California 



Marsh and Marine, Houston, Texas 



D. G. O'Brien, Inc., Natick, Massachusetts 



The manufacturer of the connector selected should be consulted for proper installation 

 procedures. 



REQUIREMENTS FOR COMMUNICATION SYSTEM 



General 



Communication between the Sealab and the Communications Command Center (CCC) on the 

 support vessel will be via a communications cable in the umbilical cord. The following modes 

 of communication are to be provided: 



1. Helium Speech Unscrambler 



2. Electrowriter 



3. Television 



a. Closed Circuit Monitors 



b. Entertainment 



4. Audio, CCC to Sealab 



5. Audio, CCC to shore via Sealab 



6. F-M Music 



In addition to the communication modes, the following information will also be transmitted 

 via the communication cable: 



1. Wedge Spirometer Output 



2. Trunk Water Level 



3. O2 Partial Pressure 



Unless otherwise specified, all equipment will be installed at Long Beach by U.S. Naval 

 Ordnance Testing Station (NOTS) Pasadena. 



