Sizing conductors for spa hook-up


Old 08-19-14, 06:12 PM
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Join Date: Oct 2012
Location: USA
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Sizing conductors for spa hook-up

The manual for an outdoor spa specifies a 50 amp main breaker and #8-3 wire to run to the subpanel (up to 100')
My question is, the spa is 210' away from the main panel. Is there enough safety factor allowed using 8 gauge wire, or should it be larger (#6 ga?)
Is the 50 amp breaker OK in either case?
Thanks everyone.
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Old 08-19-14, 06:55 PM
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The 8-3 if NM is only good for 40 amps. You need at least #6. Once outside the house the ground will need to be insulated.
Old 08-20-14, 07:36 AM
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My question is, the spa is 210' away from the main panel.
How much of that is outside the house?
Old 08-20-14, 07:43 AM
Join Date: Jul 2014
Location: usa
Posts: 279
run a 4 wire ,#4 gauge feed to a sub panel by the spa

you might use the 100 amp al trailer service from lowes.

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