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Old 05-22-2010, 10:05 AM   #1
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wire size


i need to power a 3/4 hp 220 submersible well pump and a mecury vapor night light 550 ft from the breaker box. what size underground wire should i use?

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Old 05-22-2010, 10:11 AM   #2
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wire size


What is the amps/watts rating on the pump & the light ?

For a 15a load you are looking at #6 to get the voltage drop down to 8v & ~3%

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Old 05-22-2010, 12:16 PM   #3
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wire size


Larger gauge alum wire might be cheaper than copper.
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Old 05-22-2010, 12:28 PM   #4
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If you can you should wire the MV light for 240v as well. Voltage drop at 240v is dramatically lower than at 120v.

Without the draw of both loads it is impossible to tell you wire size.
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Old 05-22-2010, 12:36 PM   #5
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wire size


MV, 50w to 175w, but the smallest resi CB is 15A?

Last edited by Yoyizit; 05-22-2010 at 01:55 PM.
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