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# electrical question

#1
07-19-01, 09:29 PM
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My father has a question, but no computer to ask it. So here it goes. "How much of a voltage drop will ocur if he runs a line 300 feet from a 200 amp server.

He wants a 60 amp power supply.
HELP! I have no idea what I just asked for him.

#2
07-19-01, 09:54 PM
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Join Date: Sep 2000
Location: United States
Posts: 18,497
Depends on the wire size and the actual (not rated) amperage. So the voltage drop depends not on how big your panel is, but on how many amps you are actually using at any given moment.

Here are some examples for usage of 10 amps. These numbers are independent of the voltage of the power (i.e., 120 volts vs. 240 volts).
• With 14-gauge wire, you lose 16 volts over 300 feet.
• With 12-gauge wire, you lose 10 volts over 300 feet.
• With 10-gauge wire, you lose 6 volts over 300 feet.
• With 8-gauge wire, you lose 4 volts over 300 feet.
• With 6-gauge wire, you lose 2.5 volts over 300 feet.
• With 4-gauge wire, you lose 1.5 volts over 300 feet.
• With 2-gauge wire, you lose 1 volt over 300 feet.
You can adjust the above numbers in the following way.
• If you are using 5 amps instead of 10 amps, the voltage drop is only half of the numbers above.
• If you have 20 amps instead of 10, double the above voltage drops.
• If you have 30 amps instead of 10, triple the above voltage drops.
• etc.

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