By Kate Armpriester
Writer, Kate Armpriester and writer, Sterling Pub Co Inc
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Likewise, four-way switches operate from three positions and not four. H you have a problem in a threeway circuit, you should test both switches to see which is faulty. When testing a four-way circuit, begin by testing the three-way switches. In the replacement process, be sure to follow safety precautions because all of the wires, regardless of color (black, red or white) are hot. Also, pay close attention to how the old switch was wired since you will have to duplicate it. Installing Special Purpose Switches.
From Source When replacing or installing switches, you should determine where the box is positioned in relation to the circuit; this position within the wiring run determines how many wires there are in the box and how they should be connected to the switch. There are only two possibilities: middle-of-the-run and end-ofthe-run wiring. In a middle-of-the-run box you will find two cables, one coming in and one going out, indicating that your switch is in the middle of the wiring run. In an end-of-the-run box you will see only one cable with its set of wires, signifying that this switch is the last outlet on the circuit.
If it still won 't work, replace ballast. Locknut -+"""'~\'AI -r I • Light blinks off and on. Straighten and sand the tube pins. Turn off power; clean and lightly sand contacts in the light unit. Replace the starter. ) Replace the ballast. • Light flickers. A normal function of a new tube. For an old tube, first replace the tube. Replace the starter. Replace the ballast. • Discoloration oftube. Brown or gray bands at tube ends are normal. Expanding black bands at tube ends indicate burnout; replace tube.