5,000 
an No. 14 wire, n = 74% 
mie ne Oe C8 
no. 6 wire, n = 94% — 
4,000 
(0) 10,000 20,000 
Depth (feet) 
Figure 4. Voltage loss gradient for two AC cable systems. 
1,300 
no. 4 wire, n = 34% 
1,000 
Volts, DC 
5,000 
rt a 
(0) 10,000 20,000 
Depth (feet) 
Figure 5. Voltage gradient for three one-wire DC systems. 
