WIRING TWO BLACK LINES
Twist the two copper wires in the first box together and attach them to the ground nut on the switch.Attach the black wire coming from the power source to the black nut on the bottom right of the switchAttach the black wire coming from the light to the top right nut on the switchAttach the red wire coming from the light to the top left nut on the switchMore items
How to Wire a Light Switch | 3 Way Switch Wiring Guide
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If I Have Two Black Electrical Wires, How Can I Tell Which
Black means hot, white signifies neutral, and green indicates ground. However, if you need to rewire a light switch or a plug socket, you may occasionally come across two black wires. It's essential that you determine which black wire is hot before proceeding. The easiest and safest way is to use a multimeter to test for current.
Two Black and Two White wires for GFCI | This Old House
the black wire that's live and the corresponding white one get attached to the bottom two screws on the GFCI, black to g-old and white to silver. the other white and black wires go to the top two screws and feed other outlets. the copper wire that's attached to the box should stay attached to the box and the other end of it will attach to the green screw on the GFCI outlet.Black and white wires both hot | This Old HouseJul 21, 2013White, Black and Red wire question | This Old HouseNov 01, 2011See more results
Which Wires Do I Connect to the Dimmer Switch? | Reference
The simple answer for a typical two-way dimmer switch is black on the dimmer goes to the black wire in the wall, the other black on the dimmer goes to the white wire in the wall and the green wire on the dimmer goes to the bare copper wire in the wall. A two-way dimmer switch has three wires coming out of the back. Usually, two wires will be
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