How many actual amps is your load?200 feet underground plus 50 more feet inside. I will use #10 for a 20 amp circuit because of the distance. To cut cost and space, is it acceptable to use #12 ground wire ? Thank you.
Can you clarify what you're getting at regarding the #10 being too small?
Yeah. It didn't make sense to me when I first read what Tom wrote. Then I read it 3 more times and realized what he was sayingIf you run a 60 A circuit with #6 conductors the egc can be a #10.
But if you have a 40A circuit and increase the conductors from #8 to #6 due to VD, the egc must be upsized proportionally - #10 is no longer compliant.
And that is the key. I rarely do a voltage drop calc off the size of the circuit breaker. Sometimes that may be prudent, but usually not.How many actual amps is your load?
If you really have 20 amps and it's really 250 feet away, you need a #6 circuit to stay below 5% voltage drop
Or a #4 to stay below 3% voltage drop
Down size the wire and up size the amps. I know this sounds strange but if I upsize the amps to 30 and upsize the voltage to 340, I could use a smaller wire, correct ? Calculates to a # 8 Cu wire, not a # 6. I could install a small sub panel and use a smaller wire, correct ?