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Electrical Wire and Cable
Electrician Training Electrical Certification wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams
wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet Wiring and Installing Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable

Smoke Detector Wiring Connections


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Summary: Homes are now required to have Interconnected Smoke Detectors in most locations, and you will notice that the interconnected smoke detectors require special wiring especially for the red and yellow wires.

How to Wire the Red Wire for the Smoke Detectors



Electrical Question about Wiring Smoke Detectors:

My hard wired smoke alarm system has red black, white wires leading to the smoke alarm.

Does the red have power to shock me?
Should I connect the third wire in the smoke detector to the red wire (inter-connect)?
I have connected white to white and black to black.

Thanks, John.

Hi John - Great Electrical Repair Question!
The red wire most likely attaches to the inter-connected line, however I would need to know the exact make and model of the smoke detector you are installing. The brand I install uses a yellow wire for the interconnect

Typically when the smoke detector goes into alarm the interconnect wire becomes energized, so yes you could get a shock in that situation.

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Complete Guide to Home Electrical Wiring
Perfect for the Homeowner, Handyman,
Electrician and Building Inspector.

Includes:
Methods for Home Electrical Wiring
Wiring Diagrams for Smoke Detectors
Interconnected Smoke Detector Wiring
Wiring Methods for AFCI Circuits
Electrical Codes for Smoke Detectors
....and much more.

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Electrical Tip

The Safest Way to Test Electrical Devices and Identify Electric Wiring!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester, [amazon.com], I use for the detection of Standard Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

Questions and Answers about Smoke Detectors