Hi... My dad just replaced their 1970's hot-water heater with a brand new one. He used the same wire as the old water heater, he added a 30 amp double pull breaker at the breaker box, however it throws the breaker, unless he un-hooks the ground wire?
There are 3 colors of wire on the "original" hot-water heater wire he is using: Black, Red and White..?
Can you please help?
Warmest Regards, Sheila