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Boomerweps's avatar
Boomerweps
Explorer
Aug 13, 2018

Looking into installing 30 TT outlet on my detached garage

Problem is that it is about 90-100 feet from the home circuit breaker box. Voltage drop calculator has about a 5% voltage drop for that distance using 10awg and about 3.5% using 8awg (not allowing for...
enblethen's avatar
enblethen
Nomad
Aug 13, 2018
I would suggest replacing the feed to the garage and then installing the RV receptacle off that.
You could use RHH/RHW/USE wire which is rated for direct burial. I would use #6. Yes, slightly overkill(50 amp). yes, #8 would work(40 amp).
The ground wire can be smaller. It would be calculated on the amperage of the circuit breaker in the source panel. A #10 ground wire would be sufficient for up to 60 amp circuit breaker.
I would install and additional ground rod at the detached garage for a little extra protection.

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