240 volt connection?
My 240 volt kiln has a 4 conductor plug my service has 3 wires(red, black, and white).
Instructions: “The wall outlet must be 3-wire 115/240-208v, solid neutral supply. … the 4th blade of the 4W30 grounding plug is for pure green-wire ground.”
What is the proper connection for a new wall outlet?
On closer inspection of the service box I find the washer/dryer out let connected as: red to the breaker, black to the breaker, white and bare wires connected to a common bus.
Oops! I think the bare wire connected to the bus doesn’t go to the washer/dryer outlet it is actually the ground wire that was wrapped around the rebar when the footings were poured. That is the bus where the white wire is connected.
the 4W30 connection is correct, that is red, black, white and a bare conductor or green wire for the ground. If at your socket you may have only the three wires, pick up a ground by bonding to the water pipe, assuring that your water pipe is properly grounded. Or wire in a ground from the panel, which is best, however the water pipe will do. This will give you a true neutral and an isolated ground for short circuit protection.
good luck!
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