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2 black wires on my light switch - Lutron Electrical Supplies

Posted by Anonymous on

4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

mkh5094
  • 145 Answers

SOURCE: 3 way dimmer turns on and off, but does not dim

All your wiring looks good. Many times dimmer just have problems and are faulty. You should note that the dimmer can only handle 600 watts. If you have that or more on it, than you have probably fried the dimming mechanism. In either case the dimming mechanism is not working properly and you will have to take it back and get the same dimmer or a different one. Tell the store they sold you a faulty dimmer and you can get a replacement at no cost.

Posted on May 29, 2010

  • 107 Answers

SOURCE: I would like to install

The circuit you are working on is a 3-location circuit - where two of the devices were 3-way switches, and the remaining device (the one you are trying to replace with a dimmer) is a 4-way switch. Standard dimmers like the one you're using CAN NOT be used to replace a 4-way location. If you wanted to use it to replace either of the 3-way switches, that's no problem - but what you're doing right now will not work.

If you absolutely want to dim the lights from that specific electrical box, my suggestion is to upgrade to a "smart dimmer" where instead of a basic dimmer and two light switches, you have three devices that talk to one another and all dim the lights together.

In terms of your ground wire questions - ground wires certainly aren't necessary to make the whole thing work - rather they're there for safety. Sometimes installers will ground the device by connecting the ground wire to the backbox (assuming its metal) and then rely on the mounting screws on the dimmer or switch to perform the grounding. There are some code rules/exceptions for allowing the device to not be grounded (usually when its in a plastic, non-combustible backbox). If you want to make sure everything is completely up to code (which are usually goverened by local municipalities), you should consult a licensed electrician - but above all else, just use good judgement. Long story short, if the devices weren't grounded before, you can't make it any worse.

Posted on Feb 01, 2011

  • 3287 Answers

SOURCE: New dimmer switch not working

Hi -

The Lutron D600P is a preset single pole dimmer. Wiring is pretty straight forward as show in this diagram. Recheck wiring and if OK, continue below.

If power is present on both wires (black / red wires), power is being passed through the switch to the lamp and the light should be on. If not, try replacing the lamp.

Minimum recommended connected load is 40 watts. This switch is ONLY for use with filament type lamps - such as traditional tungsten, halogen, etc. It is NOT to control speed of Fan Motors, nor dimming of CFL (compact fluorescent lamps) energy saving types or other ballast operated lamps such as High (or Low) Pressure Sodium, Metal Halide, Fluorescent, etc. as this would create a high heat condition and could cause a fire.

If you're still having trouble, you can contact Lutron Technical Support Center 1.800.523.9466 24 hrs / 7 days www.lutron.com

I hope this helps & good luck!

Posted on Sep 04, 2012

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I have a light switch with 3 wires that have to be hooked to it.3 black wires 3 white wires and 3 ground wires.The light switch has 1 place for the black 1 place for white and 1 place for ground.


You have 3 cables entering the box.
Each cable has black and white and ground wire.
You have a single pole switch.
The switch has 2 brass-colored screws and 1 green-colored screw.

1) One thing is certain: all the ground wires connect together and then connect to green screw on switch.

2) After that, we are guessing without more information.
Add a comment.

3) What does the switch control?

4) If the switch controls a hallway light, and there is another switch for the same light: then you have wrong switch. You need 3-way switch. Buy 3-way switch and re-post question at fixya.

5) If switch controls a bath fan-light combo, repost question at fixya.

6) If the switch controls a regular light, and no other switch is involved: then the following information might work. Or you need to do testing and re-post another question at fixya.

-White wires probably connect together and are covered with a wire nut.

-Then two black wires connect to one brass screw and 1 black wire connects to other brass screw.

-But which black wire?

-Only one of the black wires has power from circuit breaker. That is hot wire.
-Hot wire connects to 1st brass screw on switch. Either screw.

-And then connect one of the other black wires to 2nd brass screw. Turn on power and see if light turns on.
-Try other black wire same way.
-The black wire(s) that turn on lights on should be left connected to 2nd brass screw.
-If one black wire did not turn on lights, then that wire probably connects to 1st brass screw along with hot wire.

Aug 29, 2011 | Electrical Supplies

1 Answer

I understand that the black and blue wire can be connected to the black wire in my ceiling. ok fair enough. However, in my new bedroom, there is 2 switches on the wall that apparently control two black...


A ceiling fan requires a neutral wire (white), a ground wire (green), a hot wire for the fan (black), and on fans with light kits a hot wire for the lights (blue). These examples will assume that a lighting kit is going to be used, but if it is not terminations to the blue wire are not required and the circuit is greatly simplified The ceiling fan and light can also be wired through switches. When a single switch is used to connect to the ceiling fan and light the ceiling fan (black) and light (blue) would both be connected to the switched black wire. In this configuration turning the switch on would power both the light and ceiling fan. In order to turn just one off, the pull strings would have to be used. The problem with this approach, is that when the pull strings have been used to turn the light or ceiling fan off, turning the switch back on will not work until the pull string is pulled again .
The ceiling fan and light can also be wired through two switches. This would generally be two separate switches, one for the fan and one for the light. This would generally be a 3 conductor w/ground coming from the switch box. The ceiling fan (black) wire would connect to the switched black wire from the ceiling fan switch, the light wire (blue) would connect to the switched red wire from the light switch and the neutral (white) and ground (bare) would connect to the their associated wires..

Jul 07, 2011 | Heritage (5BFW52NK4KG) 52'' Ceiling Fan

1 Answer

I am replacing a programmable timer switch that controls exterior garage lights. This switch is in the same box as a ac switch that turns on the lights inside the garge. There are 3 rolmex wires inside the...


Project is not clear.
Are you replacing the timer with a switch?
I have complete files on timers, so if you are replacing the old timer with a new timer, then add a comment and say which timer you are installing.
http://waterheatertimer.org/ST01C-program.html

You have 3 cables. Assuming 120Volts.
Each cable has 1 black and 1 white and 1 ground.
White wires are twisted together and pushed to back of box.
Ground wires are twisted together and pushed to back of box.
Black wires are next:

(A) Cable A:
One of the three cables will have a black wire that connects to both the switch and to the timer.
So look for the black wire that connects to both switch and to timer.
This is the hot wire from breaker box. Connect this black wire to both switches including new switch.

(B) Cable B: One cable goes to garage lights. Black wire going to garage lights connects to on-off switch.
So the garage light switch has 2 black wires: 1 black wire from cable A, and 1 black wire from cable B going to light.

(C) Cable C: One cable goes to outdoor lights. Black wire going to outdoor lights connects to new on-off switch.
So the outdoor light switch has 2 black wires: 1 black wire from cable A, and 1 black wire from cable B going to light.

Jun 27, 2011 | Hardware & Accessories

1 Answer

I have power in 14/2 and 14/2 out to light. how do I wire the switch. I tried putting whites together and blacks to switch but it doesn't work.


Your breaker is not tripped.
Your light bulb is working.
You have a working on-off switch that has two brass screws and a green ground screw.
That is a single pole switch. Black wires go on either brass-colored screw, and whites are twisted together.
If switch has 3 screws and ground screw, connect black wires to dark-screw and one of the brass screws.

First you should test your wires.
You have 2 cables.
Both cables have black, white, and bare copper ground wires.
One cable goes to light.
Other cable comes from breaker box.

Cable from breaker box has black-hot wire and white-neutral wire.
Turn on power and test black wire to white, and then test black wire to ground.
Tester should light up with both tests.
If tester does not light up, then breaker is suspect, or there is a short in nearby box.
Track back the short towards breaker, going one box at a time, each time testing black to white and black to ground.

Next, inside the switch box, remove the switch and connect both cables without the switch.
Black to black
White to white
Turn on power, does light turn on.
If light turns on, your switch is suspect. Connect new switch. One black wire to each brass screw, and then tie white wires togethr.
If light does not turn on, your light is suspect. Open light fixture and test black to white and black to ground again.

If light tests with power, then check your bulb
If light has no power, then wire between switch box and light is suspect.

Dec 06, 2010 | Electrical Supplies

1 Answer

I want to fit a light and switch into my new workshop. I have a garage type consummer unit fitted and am not sure how to wire in the light.


I answer questions for free.
I know electric wiring.
However I might not understand your problem.
If I do not understand your problem, add a comment with more information and I will respond.

If I understand correctly you want to add a new switch and a new light in your garage.
And you are starting from scratch with no knowledge.
You are starting with a blank wall.

I do not know what a consummer unit is.
Is that a type of light?

Here's a sketch of the project:
We need an electrical receptacle or wall-plug so we can get electricity.
We need to run a cable from the electrical wall-plug to the switch.
This will bring electricity to your switch.
And then we need to run a cable to the light.

Let's talk about how you get electricity from the wall-plug.
The wall plug has a black and white wire connected to each side.
Your cable has a black and white wire.
You connect your black wire with the black side.
Connect white to the white side.

Now run the cable to your switch.
The cable arrives at the switch.
The cable has a black and white wire.
The switch is wired differently than the wall-plug.
On the switch you connect one black wire.
But the white is not connected to switch.

Now we're ready for the cable going to the light.
The cable to the light has a black and white wire.
Connect the black to the switch.
So now you have 2 black wires connected to the switch.
The black wires are on different screws.
And then connect the two white wires together.

So the switch is wired.
Run the cable to your light.
The cable arrives at the light.
The cable still has a black and a white wire.
Your light will have wires -or- it will have screws.

If light has black and white wires, then connect black to black and white to white.

If your switch has screws, then connect black to brass-screw and white to silver-screw.

Oct 30, 2010 | Electrical Supplies

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

Replacing a ceiling fan pull chain light switch.


that is strange
normally a 3 wire switch could only be able to control 2 things + off. black would be common, red would be one fan speed or set of lights and blue would be the other fan speed or set of lights.
if it is a replacement, couldn't you just hook it up like the switch you are removing?

most likely the black wires are grounds for everything and white would be power. hook it up however you like. white power would hook up to the black wire on the switch and then the blue to one light and red to the other set of lights white wires.
good luck!

Jan 06, 2010 | Westwind Classic Hugger Polished Brass 52"...

1 Answer

Wiring from plug to switch to three lights


Run a cable from the plug to the switch box with two wires and a ground. Connect the black wire to the black side of the outlet and the white wire to the white side of the outlet. Ground to ground. In the switch box connect the black wire to one side of the switch and the white wire goes directly to the white wire of the cable going to the first light. The black wire connects to the other side of the switch.(either side). Then the cable from the switch goes from light to light connecting one light to the next, maintaining black to black, white to white connections.

Dec 13, 2009 | Coffee Makers & Espresso Machines

1 Answer

Replace a pull chain in as ceiling light .i have 2 black wires one goes to the black wire with a lock nut where does the other one go


One black switch wire connects to the hot wire for the lights which is probably blue in color.

The other black switch wire connects to the black wire(s) going to the light bulb sockets.

Apr 20, 2009 | Solar 2-wire Pull Chain Light Switch For...

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