kbnorth wrote:I am reconnecting a spa after moving to a different house. I originally wired the spa to the gfci panel I removed from the old house. The breaker "popped" and was ruined. I purchased a new Square D panel/breaker unit. I wire the new unit exactly as your diagram shows but I was getting very strange voltage readings. "Upstream" of the breaker I had normal readings but "downstream" of the breaker I read 220 volts between one pole and the common but between the other pole and the common I read 20 volts. Across the two poles I read 240 volts. Have you ever seen this before? Where did I go wrong?
With a voltmeter at the house breaker panel, the GFCI panel and the tub you should get:
BLACK to RED: ~230V
BLACK or RED to WHITE: ~115V
BLACK or RED to GROUND: ~115V
You should never get 230V to common (WHITE). You have something wired wrong or possibly a short somewhere in your Square D sub panel. Make sure that you didn't accidentally swap or double up a wire in bottom of the breaker. There are 3 positions as noted in the top right of the diagram in the first post of this thread.
If you aren't able to quickly find and repair the problem with simple diagnostics and double checking your previous work stop what you are doing and hire a qualified electrician to sort it out. It isn't worth burning your house down or electrocuting yourself to death to save a few $.
jeffz wrote:There seems to be quite a bit of confusion on how to wire a GFCI. Here is a diagram for 3 and 4 wire connections, I hope it will help.
Peteyboy wrote:The GFI should trip if you have the panel wired correctly. Hot to Hot 2 legs and Neutral to neutral. If this is correct you have a bad breaker.
Some breakers only trip halfway when you push the test button.
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