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
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.