240 V Spa wired with 4 and 3 wire line combined...?
Is there a danger or fire hazard if the line from the spa motor to the electrical sub-panel is 4 wires, but the line from the sub panel to the main circuit breaker panel is 3 wires? The ground wire (4th wire) from the motor is wired to the neutral wire at the sub panel. Seems to be working normally, but I would like a professional opinion.
i am a electrician. I'm not sure i got the meaning of the question that your asking, but the first panel from the meter has 3 wires from the meter to the panel. any panel after that is considered a sub panel and has 4 wires from the first panel to that panel 2 hots a neutral and a ground. at the first panel the ground from either a water pipe or a ground rod or both will connect to the neutral bar and the neutral bar will be bonded thru a screw to the body of the panel box known as the tub. the forth wire from any and all sub panels which is your ground will be connected to the first panels neutral bar. sounds dumb but that is way the code book wants it. so if your tub is connected to a sub panel the ground wire unlike in a main panel will be isolated from the neutral until it gets to the main panel. and if that is the way yours is connected your fine.
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