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3 wire 220 volt wiring1/16/2024 Alternatively, use the red wire as the hot wire and connect the red wire of the 12-3 cable to the black wire of the 12-2 cable. You can leave the ground wire not connected. Cap the red wire and leave it untouched inside the junction box. Then connect the standard white wires together. In this option, connect the black wires of both cables together. The first is to use the 12-3 cable black wire as the hot wire. There are two options for connecting the two wires. According to the National electric code, all splices should be done inside the junction box. Push the two ends into an electrical junction box. Take the two ends of the 12-2 Romex and 12-3 Romex wires and strip ½ inch off each wire. You will also need wire cutters, Romex wires, a screwdriver, a hammer, and a wire stripper. To make this connection, you will need a junction box. How do you connect four wires to 2 wires?Ĭonnecting a four wires circuit to a two-wire line can be challenging. Then connect the black wire of the 3-wire cable to either the red or black wires of the 4-wire cable.Įnsure the twist caps and tightened and should not be easy to pull off once they are tightly secured. Place ½ inch wire inside the hole and tilt the wire stripper 45 degrees toward the wire and pull.Ĭonnect the white wire from the 3-wire cable to the white wire from the 4-wire line using plastic twist caps.Ĭonnect the ground wire from the 3-wire cable to that of the 4-wire line. For example, working with a 12 gauge wire slot is inside a 12 gauge hole. Slot the wire into a hole matching its size. Then strip ½ inch of insulation off the ROMEX wire’s black, red, and ground wires. Slot a ROMEX wire in the knockout hole you have created using a three-wire cable ROMEX wire. Knockouts are small access holes created to allow new entry points inside the junction box. Use a screwdriver and a hammer to create a knockout hole inside the junction box. This is done by switching off the breaker that powers the circuit. Start by shutting off power to the primary four-wire circuit. Here is how to connect the two-wire circuits On the other hand, the three-wire circuit will have a red, black, and ground wire configuration. The four-wire circuit will have a red, black, white, and ground wire configuration This is mainly used for large lighting applications. This is done to connect two 110v circuits to one 220v circuit. You can connect a four-wire circuit to a three-wire in a junction box.
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