Long run / breaker size ?

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Old 01-20-18, 01:25 PM
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Long run / breaker size ?

In one of our cow lots we have a tractor shed, it has a 10/2 underground wire ran 575 ft. To main breaker box,
it was buried approx 24 deep, and was to just supply power for a 90 watt 120 volt dipstick heater
According to the online calculator 10/2 wire at 575 ft, is good for 4 amps with 5% voltage drop.
now as I said the dip stick heater is only 90 watts at 120 volts.
my question is : what size breaker should I have at main box, and should at the end of run have a gfci outlet that the 90 watt dipstick heater be pluggd
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thank you for your time
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Old 01-20-18, 02:31 PM
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Welcome to the forums.

You can use a 20A breaker. Technically the wire is rated for 30A but you cannot protect a regular 120v service receptacle with anything over 20A.
 
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Old 01-20-18, 11:47 PM
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Thank you pjmax for your input, now should I also have the outlet as a gfci ?
 
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Old 01-20-18, 11:59 PM
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A GFI receptacle would be a very good idea.
 
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