The above diagram says a lot. This is the way
that most 230 volt portable spas are connected. I always prefer to use 6 gauge copper
conductors. Some installations may be able to get away with only using 8 gauge, but that's
all dependent upon the maximum current draw of the spa, and the distance of the wire run.
Consult with an electrician on the recommended specs, and code compliance for your area to be
sure. Notes:
1. If your house has 4 line service into the main circuit
breaker box, then the neutral pig-tail from the GFCI will be tied to the neutral bus, and the
ground tied to the ground bus.
Otherwise, if you have 3 wire service, as most older homes do, then
the ground to the spa, and the white pig-tail from the GFCI will tie directly to the combination
ground/neutral bus. Do NOT tie the neutral from the spa, to the neutral bus, (unless you have
a 2 wire GFCI). (Most common mistake made installing an electrical run for a spa!).
2. Be sure to attach the ground wire to the remote cut-off
box ground connection. Do NOT tie the neutral and the ground wires together here!
(Second most common mistake).
3. Be sure that the neutral wires to the spa, inside the
remote cut-off switch, are tied together, and totally isolated from any other wires, particularly
the ground wires. Do not tie the neutral wires to any terminal in this box, unless the
terminal is isolated from ground.
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