Questions concerning wiring a hot tub
I originally posted this in the electrical forum, but got a response that basically said if I didn't already know how to wire a hot tub, I shouldn't try it. I'd just like some more opinions, so here's my post.
I've done lots of home rewiring and know what I'm doing there. However, my neighbor is buying a hot tub and wanted to know if I'd help him wire it up, and I could use some advice on doing it right.
He's got a 200amp main panel and room for a 220V breaker. He'll have a run of about 20' of wire between the breaker box and the hot tub. He told me that the wiring the guy at Home Depot recommended has 4 conductors encased in a flat cable; 3 of the conductors look to be about #8 stranded, and the 4th conductor is much smaller diameter. He also has a weatherproof hookup box that contains a GFCI, which I haven't looked at yet.
At the service panel end I'm presuming I'll connect the red and the black to the breaker and the other two wires to the ground bar. At the other end of the cable, where it hooks up to the GFCI, is there anything special to know or will that wiring be obvious?
I'm also recommending that he run the wiring through conduit rather than just do a direct bury in the ground. In this kind of application, are there two kinds of wire, one for direct bury and another for running in conduit?
I would assume that there should also be some distance between the hot tub and the GFCI box: what is the code requirement?
Is there anything else I need to know to be safe here?