6# or 8# wire- again

indywoodAugust 13, 2010

looked through earlier posts, and didn't quite find this question answered- I have an older, smaller hot tub that I'm about to hook back up. The tag on my unit calls for a 40amp circuit, which I have via 8/3 w/gnd travelling 18 feet to the gfci disconnect. Can I stay with 8# thhn to the tub? (only about an 8' run) Here's the other thing- can I use a 50amp gfci spa panel within this 40 amp circuit (the supply breaker would trip in the event of overload, right?) I ask this after finding the 50 amp boxes to be cheaper and easier to find

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Ron Natalie

You probably need wet rated conductors if this is an outdoor installation. For any outside parts you need to use an insulated ground and NOT 8-3 cable with a ground bare in the sheath (the code does allow such for inside runs).

If the breaker in the main panel is 40A, then the 50A GFCI serves as a GFCI and an oversized disconnect (which you need anyhow within sight of the maintenance point on the tub).

    Bookmark   August 14, 2010 at 3:37PM
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