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I am replacing a light switch with two black wires and 1 red wire. What is the red wire for?

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It is a 3 way switch. It must have another switch on the other side of the room that works the same light. One of the wires is a traveler, usually it is not colored, So, you could have 2 things being switched on from one hot wire, test the wires and see which is hot, and mark it, then, take one other wire at a time to see where it goes, find the light, or lamp, or fan, if the 3rd wire doesn't do anything, is there another switch for the same light on the other side of the room? 3 way switches are tricky, keep the package, it has a schematic on it, hopefully it is right at the other end, and it will go right in. check it out, hope this helps.

Posted on May 13, 2010

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SOURCE: I'm using a Leviton 1755 combo 3 switch for a bath

remove white switch one and connect to incoming white ground--all whites should be connected [hooked] together these are grounds-- switch 1 black from fan ,leave switch 2 red from fan ,switch 3 vanity black

Posted on Feb 22, 2010

  • 351 Answers

SOURCE: Replacing a pull chain 3-way ceiling fan light switch

OK .. the thick black and white are the power for the fan , are there also white wires on the lamp sockets ..??
The thick black wire should connect to the black wire on the switch.
The small black wires connect to the red and blue wire on the switch .. two small black wires each .. that should give you a position for 2 lights , and 4 lights, on the step switch .. but there should be white wires from the lamp sockets connected to the thick white from the fan .

please respond .

Please Vote !!

Posted on May 25, 2010

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I want to replace our old carling toggle switch to a new timer switch for an attic fan. I have 2 black wires and one red. My new switch has one black one red and one green wire.....what do I do?


Is the fan 2-speed?
Old switch has 2 black and 1 red... sounds like 2-speed.
One black is probably Hot, and other black and red go to each speed??
Choose 1 speed and wire timer as follows:
http://waterheatertimer.org/How-to-wire-timers.html
Add a comment with more details about the timer you are using, and include if fan is 2-speed and what each wire tests.

Jul 30, 2013 | Electrical Supplies

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We have a motion sensored light with two lights and the motion box. 1 black wire and one white per light but the middle has 1 black, 1 white and 1 red. We are hooking it to the porch light and dont know...


You are replacing porch light with light fixture with motion sensor device.
Each light has 1 black and 1 white wire.
The motion sensor has 1 black 1 red 1 white:
Copy following link for motions sensor wiring illustration:
http://waterheatertimer.org/How-to-wire-switches.html#motion

Oct 17, 2012 | Hardware & Accessories

1 Answer

The Casablanca 88U33M Scandia Ceiling Fan only has three wires, a black, a white, and a green wire (ground). How do you wire the fan and light on seperate switches?


If you want to control both the light and the fan using 3-ways, then just wire 2 sets of the 3-way circuits. For this you need two sets of 3-wire between the switches, and one 3-wire cable from the switch location to the fan/light box.

At box #1 (a 2 gang box), you will run a power cable (marked cable #1) into it. From there you run 2 sets of 3-wire cables (identified as cable #2 & cable #3) to the other switch location, which will also be a 2-gang box (box #2).

Also from box #1, you will run a 3-wire cable (cable #4) to the fan/light box (box #3).

Hook up is as follows:

Box #3: connect black of cable #4 to black (fan), connect red of cable #4 to blue (light), connect white of cable #4 to white (fan/light), and connect the bare to the green.

Box #2: Connect white of cable #2 to identified terminal on 1st 3-way switch (#3). Connect red & black of cable #2 to the remaining screws of 3-way switch #3. Next connect white of cable #3 to identified terminal of 2nd 3-way switch (#4), and connect black and red to remaining screws. Tie all grounds together and terminate to both switches.

At box #1, connect black from cable #1 to whites in cables #2 & #3, using a wirenut. Connect white in cable #1 to white in cable #4. Connect black and red in cable #2 to 3rd 3-way switch (#1) and connect black and red in cable #3 to 4th 3-way switch (#2). Connect black in cable #4 to identified terminal of 3-way switch #1, and connect red in cable #4 to identified terminal on 3-way switch #2. Tie all grounds together and to the switches

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1 Answer

2 switch system. 2 black wires and 1 red wire in the switch. I have hooked up black wire from the switch to the red wire in the box. green wire from switch to black wire from the box and red wire from the...


You posted under ST01C and are wiring timer to replace 3-way switch.
Open following link for specific illustrations:
http://waterheatertimer.org/ST01C-program.html#ST01C
http://waterheatertimer.org/pdf/ST01C-explanation.rtf

1) The timer replaces one of the 3-way switches. The other 3-way switch remains, but must be rewired.
2) The timer must replace the 3-way switch that receives power from breaker box. It cannot replace the other 3-way switch. This is because the timer Black wire must always receive power.
3) The timer blue wire must connect to Load (light)
4) The ST01C red wire is only used when wiring for 3-way.
5) When the red wire and blue wire are connected together, they reverse the timer program. When timer red and blue are disconnected, the timer resumes programming. Connecting and disconnecting the red and blue wires is how the timer mimics 3-way operation.
6) The remaining 3-way switch must be wired so it will connect and disconnect the red and blue timer wires. So the remaining 3-way switch has to be rewired to meet specific timer wiring.

Jul 03, 2011 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

I have the unit wired and it does not wotk.I have black to black,red to red green to ground and white to white,any thoughts? Thank you


Electrician test wiring before connecting anything.
First of all, you don't mention what type of switch was replaced.

1) Leviton 6230 countdown timer is made to replace single-pole light switch only.
Single pole is where 1 switch controls the Load (light fan motor)

Your wiring sounds like 3-way switch.
3-way is where 2 switches control same Load.
For example a hallway usually has 3-way switches.

To confirm. If old switch has 1 dark screw, 2 brass screws, and 1 green screw, then that is 3-way switch. Use Leviton LTB15, LTB30, LTB60, LTB02, LTB12 countdown timer for 3-way.
Smarthome sells product and shows .pdf manual
http://www.smarthome.com/4255/Leviton-LTB60-1LZ-4-Button-10-20-30-60-Minute-Countdown-Timer-Switch/p.aspx


2) If old switch has 2 brass screws and 1 green screw then that is single-pole switch.

3) If you are replacing single-pole switch, here are testing & wiring instructions for Leviton timer.
Remove device and separate wires for testing.
Use ordinary two wire tester.
Tape tester leads to wood sticks so hands are away from power.
Do not untwist wires that were twisted together before you started.
Turn on power.
Test each wire to bare ground wire.
Tester lights up on Hot wire. This wire will connect to timer black wire.
Now you know Hot wire.
Test Hot wire to each of the other wires, excluding bare ground wire.
Tester lights up on neutral. Timer white wire connects to Neutral wire.
If box does not contain Neutral wire, then timer white wire connects to bare ground.

Timer green wire connects to bare ground wire.
Timer red wire connects to wire going to Load.

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1 Answer

How do you wire a 3-wire timer switch (white, black, red) to replace a single light switch to a front door light?


You have a 3 wire in-wall timer.
Colors red black white

You are replacing single pole switch that has 2 wires (plus ground, we'll ignore ground for now)

So switch has 2 wires:
1 switch wire goes to Load/lights > this wire connects to timer red wire
1 switch wire is Hot from breaker > this wire connects to timer black wire
When finished, if lights do not turn on, then reverse red and black wires.

Timer white wire powers clock inside timer.
To complete circuit to clock, white wire is connected to neutral wires.
Located in back of electric box are white wires twisted together and covered with wire nut.
These wires are neutral, connect timer white wire to these wires.

If box does not have neutral wires described above, connect timer white to bare ground wire.
Add a comment any time

Dec 10, 2010 | Hardware & Accessories

2 Answers

Utilitech Wall Timer #0192773 does not switch landscape lights on? Replaced Intermatic that had 3 wires. Black to Black, blue to black and red was capped. Utilitech came with 4 wires - black, white,...


Old timer: Intermatic EJ500 & ST01C timers have a battery. Battery operates the clock motor. Red wire is for 3-way circuit [a hallway with 2 switches is a 3-way circuit].

Utilitec timer, clock runs on 120Volt circuit instead of battery. So clock has to have power.

How to connect wires:
Black timer wire connects to hot wire from breaker box.
Red (or blue) timer wire goes to landscape lights.
White timer wire connects to white neutral wire [or if no neutral is available, connect to bare ground wire].
Green timer wire goes to bare ground wire.

How to find black hot wire and white neutral wire inside box
: Disconnect and separate wires so you can test. Use ordinary tester. Power is on. There is only 1 black hot wire inside each electrical box. Test each black wire to bare ground until tester light comes on > that identifies the black hot wire. Next, test black hot wire to white wires until tester light comes on > that is the neutral wire. Exception: This test does not necessarily work with 3-way switches since they reverse each time switch is thrown.

Sep 14, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

I have an ST01 timer that I want to place in a three way circuit that appears to be different than that shown in the directions. My circuit has power (black/white/ground) coming into switch 1 with a three...


One caveat of most In-Wall electronic switches/timers is that the device _must_ be installed at the switch box that has the power, in your case switch #1. In order to install it at switch #2, in your case, you need an extra wire between the switches (to carry the HOT wire), and unfortunately, the bare ground(ing) wire is not permitted to be used to carry current per National Electric Code (NEC).

In your case the wiring for the ST01 is as follows:

Switch box #1: Connect the incoming White wire to the White wire in the 3-wire cable that goes to switch box #2. Connect the incoming (Black) HOT wire to the Black wire on the switch/timer. Connect the Red wire in the 3-wire cable to the Red wire on the switch/timer. Connect the Black wire in the 3-wire cable to the blue wire on the switch/timer. Connect the green wire on the switch/timer to the 2 bare ground(ing) wires. If you have a metal box this connection should also have a pigtail that connects to the box with a green ground screw.

Switch box #2: Remove all of the existing wires from the 3-way switch. The three-way switch will have 2 screws the same color (usually black) and 1 screw (usually brass). For this scenario, one of the black screws will _not_ be used.

Connect the Black wire in the 3-wire cable coming from switch #1, the Black wire going to the lights, and a short Black pigtail together under one wirenut. The pigtail is then connected to the brass screw on the 3-way switch. The Red wire in the 3-wire cable coming from switch #1 is connected to one of the 2 black screws on the 3-way switch (pick one).

In effect you are installing a single switch at switch box #2. In fact, you can use a regular single pole switch if you want too.

To finish, connect the White wire in the 3-wire cable coming from switch #1 to the White wire going to the lights.

Grounding is the same as switch #1 except you'll need a pigtail to connect to the green screw on the 3-way switch.

That's it. You may want to check the battery compartment in the switch/timer, as sometimes they put in a pullout plastic tab to keep it from being energized until needed.

Now, the E1210 is a different animal, and can only be used to replace a single pole switch. You could use it by basically passing the power through to switch box #2 from switch box #1 and then cover switch box #1 with a blank plate. The ST01 could be used that way too, in which case the black on the device connects to the hot, the blue to the lights, and the red on the device is not used, nor will the Red wire in the 3-wire cable between the switch boxes be used.

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1 Answer

Replacing a pull chain 3-way ceiling fan light switch


OK .. the thick black and white are the power for the fan , are there also white wires on the lamp sockets ..??
The thick black wire should connect to the black wire on the switch.
The small black wires connect to the red and blue wire on the switch .. two small black wires each .. that should give you a position for 2 lights , and 4 lights, on the step switch .. but there should be white wires from the lamp sockets connected to the thick white from the fan .

please respond .

Please Vote !!

May 24, 2010 | Westinghouse Electric Westinghouse...

1 Answer

I'm using a Leviton 1755 combo 3 switch for a bath light/fan combo and then onto a vanity light. Basics: wires from ceiling light/fan: black, red, white, ground. Wires to vanity light: black, white,...


remove white switch one and connect to incoming white ground--all whites should be connected [hooked] together these are grounds-- switch 1 black from fan ,leave switch 2 red from fan ,switch 3 vanity black

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