Connecting a two wire light fixture to a three wire power supply cable is not an ordinary occurrence. The hot source wire is spliced at the light box to the white cable wire running to the first switch box.
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How to wire a light switch with 3 wires. Three way switch wiring where power goes directly to the light. Source 1 comes in at the light fixture and a 3 wire cable is run from there to the switch half on the device. Three wire supply cables generally carry red and black hot wires of 110 to 120 volts each with a single white neutral wire. The lighting could be added to the three wire cable provided that the circuit breaker is no more than 15 amps and the wire size is no greater than 14 gauge. Two wire cable runs from the light to sw1 and 3 wire cable runs between sw1 and sw2. The old switch had four wires going into l1 l2 l3 and l4.
Leave 810 inches 203254 cm of wire inside each of the boxes before cutting the cable to facilitate easy splicing and connection to the switch and fixture. In this diagram the source for the circuit is at the light fixture and the two switches come after. The hot from the source is spliced to the black wire running to the combo and to the input side of the switch. Install a 3 wire cable from the first switch box to the light fixtures box. B the wires from the power source may enter the light fixture box first then travel to one switch and then connect that switch to the other switch. Three way switch wiring where power connects to first switch and then the light.
Connect the wires to the new 3 way switches with ground screws using one of the two wiring diagrams fig. The 14 3 cable has three insulated conductors. 3 way switch wiring with light first. Therefore the hot wire is connected directly to the fixture. Feed a length of 14 3 type nm cable or 12 3 if youre connecting to 12 gauge wire between the two boxes. White black and red plus a bare ground wire.
The white neutral from the source is connected directly to the light fixture. Re wiring 3 way light switch hi guyscould really do with some advice for replacing a 3 way single light switch.
Gallery of How To Wire A Light Switch With 3 Wires
