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Old 11-15-2010, 02:34 PM   #1
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Hallway two way switches

Hi: I have an hallway light fixtures which have a two ways switches(I beleive) you can control the fixture from begiining of hallway of a bedroom area and at end of the hallway .
How can you check and see which switch is out?
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Old 11-15-2010, 02:40 PM   #2
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The proper terminology would be called a 3 way switch.

What do you mean the switch is out?
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 11-15-2010, 05:24 PM   #3
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1. Find where the power comes in. The power feed wire is connected to the common terminal of one of the switches. Using a voltmeter you will always measure about 120 volts from that terminal to GROUND.

2. As you flip that switch you should measure 120 volts from just one of the other terminals and the 120 volts or nothing changes back and forth between those terminals (traveler terminals).

3. Now go to the second switch and measure between a traveler terminal and GROUND. As you flip the FIRST switch you should measure the 120 volts from one or the other traveler terminal of the second switch.

4. Measure between the common terminal and ground for the second switch. Depending on which traveler terminal of the SECOND switch has the 120 volts, the position of the second switch should put the 120 volts at the common terminal.

If 1 fails you have a power problem as opposed to a switch problem.
If 2 fails then the first switch is bad.
If 3 fails then there is a bad connection between the two switches.
If 4 fails then the second switch is bad.
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