Question

A 3 phase 208 volt circuit using #6 THWN copper wire that supplies a 25 ampere load is located 200 ft from the distribution panel, what's the voltage drop of the supply wire?

1. 2.33 volts
2. 4.42 volts
3. 6.60 volts
4. 8.54 volts

Answer 1

The voltage drop of the supply wire is approximately 2.06 volts.

Step-by-step explanation:

To calculate the voltage drop, we can use Ohm's Law which states that voltage drop is equal to the current multiplied by the resistance: V = I * R. In this case, the resistance of the #6 THWN copper wire can be obtained from a wire resistance table, which is approximately 0.412 ohms per 1000 ft. Since the circuit is 200 ft long, the resistance of the wire is 0.412 ohms/1000 ft * 200 ft = 0.0824 ohms.

Now we can calculate the voltage drop: V = I * R = 25 A * 0.0824 ohms = 2.06 volts. Therefore, the voltage drop of the supply wire is approximately 2.06 volts, which is closest to option 1: 2.33 volts.

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