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This
is a 4 wire mains box, showing a properly installed Ground
Fault Circuit Breaker for a hot tub:
With explanation
of each wiring component for the spa's electrical
installation
GFCI
Installations like this are relatively simple. Just remember
that the two hots, and neutral connect directly
to the circuit breaker itself. The pigtail coming out of the
circuit breaker goes to the neutral bus in the box.
If you have a
spa/hot tub that does NOT require a neutral (many Sundance &
Vita Spa), and your GFCI has a neutral pigtail, you still must
install the pigtail to the neutral bus in order for the GFCI to
function properly. In this case you would not run a neutral to
the tub – either that, or, run the neutral to the tub,
and tie it off with a wire nut. This is actually a better idea
– if at some time in the future you replace that tub with
another brand, or want to replace the controller with something
else, you most likely will need the neutral line, as 95% of all
other spas and hot tubs require 4 wire service, (including
neutral).
After you have
run the wire – and attached it to the GFCI, push the
wires inside the breaker box to their final resting place, then
TIGHTEN DOWN THE TERMINALS as the last thing you
do before you put the cover on the breaker box. These breakers
carry a LOT of current, and a loose connection can burn up that
expensive GFCI pretty quick.
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