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old light switch has 2 black wires

Two black wires for a switch
Two black wires for a switch

lighting - How to convert Light Switch from 2 red, 2 black, and ground to 1  traveler, 1 neutral, and a ground? - Home Improvement Stack Exchange
lighting - How to convert Light Switch from 2 red, 2 black, and ground to 1 traveler, 1 neutral, and a ground? - Home Improvement Stack Exchange

Help Wiring a Switch with 2 black wires and one white - RedFlagDeals.com  Forums
Help Wiring a Switch with 2 black wires and one white - RedFlagDeals.com Forums

Old outlet has 2 black wires and 2 white. Is it safe to connect two white  and two black under one screw with the new outlet? Thank you! : r/electrical
Old outlet has 2 black wires and 2 white. Is it safe to connect two white and two black under one screw with the new outlet? Thank you! : r/electrical

How to Wire a Light Switch — Steps for Both Single-Pole and 3-Way Switches
How to Wire a Light Switch — Steps for Both Single-Pole and 3-Way Switches

Why does my outlet have 2 black and 2 white wires? - Quora
Why does my outlet have 2 black and 2 white wires? - Quora

electrical - How can I replace this light switch? - Home Improvement Stack  Exchange
electrical - How can I replace this light switch? - Home Improvement Stack Exchange

Replacing switch: three black wires??? - DoItYourself.com Community Forums
Replacing switch: three black wires??? - DoItYourself.com Community Forums

Old doorbell transformer has two black wires only what should I connect the  new ones too? : r/electrical
Old doorbell transformer has two black wires only what should I connect the new ones too? : r/electrical

Replacing old light switch with Lutron Smart Dimmer switch. I have one  yellow wire and one red wire. Do they both just connect to the black wires  on the switch and do
Replacing old light switch with Lutron Smart Dimmer switch. I have one yellow wire and one red wire. Do they both just connect to the black wires on the switch and do

How to Wire a Light Switch — Steps for Both Single-Pole and 3-Way Switches
How to Wire a Light Switch — Steps for Both Single-Pole and 3-Way Switches

Three Way Wiring Help Requested - Devices - Hubitat
Three Way Wiring Help Requested - Devices - Hubitat

Replacing switch: three black wires??? - DoItYourself.com Community Forums
Replacing switch: three black wires??? - DoItYourself.com Community Forums

Light switch only has two black wires. Can I add an outlet without white  (neutral) wire? : r/askanelectrician
Light switch only has two black wires. Can I add an outlet without white (neutral) wire? : r/askanelectrician

Identifying Wires on Your Old Switch – Brilliant Support
Identifying Wires on Your Old Switch – Brilliant Support

electrical - Light Switch with 2 black wires and one red - Home Improvement  Stack Exchange
electrical - Light Switch with 2 black wires and one red - Home Improvement Stack Exchange

Light switch has 2 hot wires
Light switch has 2 hot wires

lighting - Light switch with one red and two black wires. Dont think it's a  three way - Home Improvement Stack Exchange
lighting - Light switch with one red and two black wires. Dont think it's a three way - Home Improvement Stack Exchange

How to Wire a Light Switch — Steps for Both Single-Pole and 3-Way Switches
How to Wire a Light Switch — Steps for Both Single-Pole and 3-Way Switches

How do I replace a light switch to a dimmable switch? - Bogleheads.org
How do I replace a light switch to a dimmable switch? - Bogleheads.org

When wiring a three way light switch, load or line wite - Connected Things  - SmartThings Community
When wiring a three way light switch, load or line wite - Connected Things - SmartThings Community

Two black wires connected into a single black wire in light switch box -  Home Improvement Stack Exchange
Two black wires connected into a single black wire in light switch box - Home Improvement Stack Exchange

wiring - Converting switched outlet with 2 black and 1 red for a smart  switch - Home Improvement Stack Exchange
wiring - Converting switched outlet with 2 black and 1 red for a smart switch - Home Improvement Stack Exchange

Wiring a Switch Loop - Fine Homebuilding
Wiring a Switch Loop - Fine Homebuilding

3 Way Switch Installation - YouTube
3 Way Switch Installation - YouTube

Swap out those old crappy 3-way light switches for good - CNET
Swap out those old crappy 3-way light switches for good - CNET