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Old 03-21-2013, 12:33 PM   #18
Gnarly Adventurer
kiwi_outdoors's Avatar
Joined: Nov 2007
Location: Oakland, CA
Oddometer: 114

Street transformer is center tapped
center = zero volts = white wire inside your house
either and of the coil is about 115V relative to center - these go to 2 lugs on your breaker panel (black and black or black and red wires)

so thats the three wires coming into the house

the ground wiring inside the house is a "backup" path for current in case the appliance has a problem

ordinarily grounding is for local safety, so we use an earth rod and ground metal pipes and so forth

your sparking sounds interesting, and warrants a professional to check it out
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