10 - 120 V) which was distributed to the respective electrical systems 

 throughout the four habitat compartments from one central distribution panel 

 (Figure 24) located in the engine room. Each compartment had a secondary dis- 

 tribution panel as a safety measure to protect from individual circuit over- 

 load. These panels were placed in convenient locations in their respective 

 compartments to allow easy access in the case of an emergency. 



Y-A,THREE-PHflSE XFMR 

 BANK 120/208- 480V 



THREE- PHASE r- 

 THREE-WIRE 

 UMBILICAL CABLE 



A-Y, THREE -PHASE 



XFMR BANK 



480- 120/208 V 



MAIN DISTRIBUTION PANEL 



J3 



fM- 



480 -240V 



I 



480-V 



THREE-PHASE 

 LOAD 



} 





MAIN 

 POWER 

 PANEL 



MAIN BREAKER 



l^t 



C (, 





COMFfiRTMENT BREAKER 



PANEL WET ROOM 



(TYPICAL OF THE FOUR 



COMpaRTMENTS) 



n 



TO 120-V ONE-PHASE LOADS 



SINGLE- 

 POINT 

 SYSTEM 

 GROUND 



Figure 24. Single Line Diagram, TEKTITE Electrical Power Distribution 

 System 



Although the input power to the habitat was 30 with a floating ground, all 

 power on the secondary side of the transformers in the habitat was distributed 

 with a grounded or neutral conductor. All electrical fixtures and equipment 

 were both electrically and mechanically grounded to assure safety from shocks. 



Power to the habitat was monitored by a watt-hour demand meter located at the 

 power umbilical end on the surface. The accumulated watt-hours were read and 

 recorded every two hours and an instantaneous power usage reading was also 

 taken by timing the rotor of the watt-hour demand meter for ten revolutions. 



The average daily power usage for the entire TEKTITE II program was 750.6 kilo- 

 watt hours per day. The maximum power consumed in one day was 895 KWH which 

 was a 37.3 Kw demand. 



The habitat electrical system had few problems during the program. Several 

 motor capacitors failed after power surges caused by erratic operation of the 



11-39 



