Question

In large industrial facilities, it's common to tap from an overhead feeder and run the feeder conductors underground to another point in the distribution system. Underground feeders usually operate at voltages higher than?

A. 275,000 V.
B. 600 V.
C. 1000 V.
D. 100,000 V

Answer 1

Underground feeders in large industrial facilities typically operate at voltages higher than 600 volts (Option B), as local power distribution operates at levels ranging from 5 to 13 kV before being stepped down further for safety.

Step-by-step explanation:

Underground feeders in large industrial facilities commonly operate at voltages higher than 600 volts (Option B). Electric power is usually generated at voltages greater than 10 kilovolts (kV) and is transmitted over long distances at voltages ranging from 120 kV to 700 kV to limit energy losses. According to the information provided, where local power distribution to neighborhoods or industries goes through a substation, the voltages used for short distances range from 5 to 13 kV before being reduced to levels such as 120 V, 240 V, or 480 V at the user site for safety.