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Using 240 volt wire from laundry room to Spa

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I've been getting quotes fttt5rom electricians to run 220 wire to my hot tub in the backyard. One of them suggested I can use the 240 volt wiring from the laundry room since I don't need it for my dryer. The problem is this wire is only 30 amps and the spa suggests 50 to 60 amps. This guy insists that it won't be a problem and even with seven people running all the Jets full power that it won't trip the breaker. He said if anything trips a breaker it would be from heating it. Does this guy know what he's talking about?

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It depends on the wire gauge going to the dryer plug and how far from that location your hot tub is going to be.

IF the dryer outlet is #6 wire it is good for 55A at 60' so the total length from the breaker panel to the hot tub thru the dryer outlet cannot be more than 60'. #4 wire is good for 60A at 75'. The dryer outlet has a 30A breaker, it may have heavier wire that will support higher current draw than 30A. That's what you need to find out.

I wouldn't trust the guy that said this is safe without knowing what the wire to the dryer outlet is. Somehow, I don't think it's #4 and also doubt it's #6. It's probably more like #8 and that is to light to properly power the tub.

I ran #6 to mine at 50', I helped a friend run #6 to his at 60'. 

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