4 wire outlet the wire. You should have already measured and cut the hole in the drywall for the outlet.
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Remove the screws and open the terminal area.
How to wire a 220v plug with 4 wires. Black wire hot to a brass terminal screw red wire hot to another brass terminal screw white wire neutral to the silver terminal screw and green wire ground to the green terminal screw. This simply means there are two hot wires one neutral and one ground. So either 6 or 8 wire.
The reason for the 4 wire plug is so that appliances can use the neutral from the circuit box to tap off half the 220v and get 110v for internal motors or controls. Slip the back end of the housing over the power cord with the stripped wires coming through the front. Consult a licensed electrician before beginning any work.
These wires are a lot harder to handle and thread through the walls and ceilings and generally cost a lot more than your normal 12 and 14 wires. The load tool appliance or whatever uses 110 volts from each wire and therefore is 220 volts. Hook the wires around the terminal screws on the plug cover in the following order.
You will have to cut holes in the drywall chisel space for the wires in the wall studs and use a fish tape to pull the wire along. Notice on the prongs that the bottom one has a 90 degree bend inward. A 220 volt outlet is double the voltage of a typical home outlet and requires the use of an electrical cable with four wires.
Some 220 volts ac plugs have 4 prongs. The screws should be green silver and black or dark bronze. Make sure the breaker is turned off.
That is not needed for a welder. You can just swap out the plug. Two of the wires carry 110 volts each.
Tighten the screws to secure each connection. Depending on the type there should be two screws that hold the plug closed. Theres also a neutral wire and a ground for safety.
The black and red will each carry 110 volts. The four color scheme includes an additional white wire. If you were installing a four wire 220 outlet chances are its for a stoveoven.
Loosen the screw holding the housing on the plug with a slotted screwdriver. Now this could be either 40 or 50 amp. Loosen the terminal screws on the back of the plug with a slotted screwdriver.
Strip about 34 of an inch of insulation from the ends of each of the wires on the cord.
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