While trying to get a hot tub up and running, I have a breaker problem.
With any connection with 120V (using a line and neutral wire), the breaker trips.
If I only connect 240V connections, being the pump and the heater, with the contactor and pressure switches bypassed, the tub runs and heats up.
On 120V, there is only a light bulb, and a contactor, which is fed through a pressure switch and limit switch.
If either of the two, light / contactor, are connected to 120, the breaker trips.
The possibilities I see are:
- Both the light circuit, and the contactor are shorted to ground.
- The electrician who installed the 240V circuit did something strange.
I am having trouble beleiving both circuits are shorted, that would be too much of a coincident.
I do not completely understand 240V breakers. Could I have a version that requires complete current balance on 240V? If only 240V connections are attached, there should be no current on the neutral wire. This case runs fine.
In the event 120V is connected, current (a small amount) should exist on the neutral wire.
Why is the breaker tripping???
I suppose my next step could be to detach the wiring from the tub, and just try to power a lamp or something to ensure it is nothing in the box...