20 Most Recent Pass & Seymour Trademaster 3-Way 15 Amp 120/277-Volt Decorator Switch, Light Almond #TM873 Questions & Answers

This site will have a video on installation.

Pass & Seymour... | Answered on Oct 07, 2017

Install one dimmer at the load end feeding the light. Install a standard 3way switch at the other end. Make sure the dimmer switch is rated for the type of bulbs in the fixture. ie Led, halogen etc.

Pass & Seymour... | Answered on Oct 07, 2017

Standard 3way switch. There are two crews the same color, those are for the travelers. The odd colored screw is for the power in or switch leg out depending on which end of the line it is located.

Pass & Seymour... | Answered on Oct 07, 2017

If you want two fixtures to be operated by the same dimmer, it is easier to just connect the fixtures together by twisting leads together and then wire nutting them and then run one set of leads to switch. That way you meet all codes.

Pass & Seymour... | Answered on Jun 12, 2011


You will always have voltage through the black incoming wire unless you turn your circuit breaker off. This wire will be attached to the common terminal on the switch. Is this what you were testing?
The power comes in the common terminal and then is switched through, or on, and broken, or off, when the dimmer is clicked. Therefore, there is always power coming into the switch.

Hope this helps, if it does, please place a vote for me. Thanks,

Handie Andie

Pass & Seymour... | Answered on Mar 29, 2011

With 3-way dimmers, you have to buy a dimmer-and-companion-dimmer combo.
The two dimmers communicate with each other


Pass & Seymour... | Answered on Jan 10, 2011

The key to three-way switches is the dark screw.
And different brands of switches put dark screw on different side of switch.

So, lets get out of this mess with a bit of testing.
You have two switches with 3 wires on each switch for a total of 6 wires.
Take out both switches and separate wires for testing.

Turn on power and test each wire to bare copper wire.
One and only one wire will test Hot.
The hot wire goes to dark screw on switch1.
The other two wires in that box go to either screw on switch1.
One switch done, one switch to go.

Move switch1 lever to down position.
Turn on power and test 3 remaining wires.
One wire will test hot. Mark this wire.
Move switch1 to up position, and test 3 remaining wires again.
A second wire will test hot. Mark this wire.
The 2 marked wires attach to either brass screw on switch2.
The third wire attaches to dark screw.
Both switches done.


Pass & Seymour... | Answered on Nov 20, 2010

I answer questions for free
I work with timers and electrical devices.

If I understand correctly you replaced a 3-way switch.
The new switch has 3 screws (plus green ground screw)
You put the Hot wire on the dark screw correctly.
You attached the two travelers to the brass-colored screws.
The two travelers are red and white.
You connected the ground wire to the green screw.
The ground wire is not supposed to be connected to with the white wire, and I doubt it is because that would trip the breaker.
The lights are working correctly.

If you followed the formula above to the letter, then the lighted switch should light up.
My best guess at this point is that the lighted switch is defective.
The Pass and Seymour webpage does not have manuals to look at like Leviton and Lutron products.
As a result I can't pour over a manual and put a magnifying glass on the wiring and wording to see if there is something we've missed.
But it's just not that complicated ... the light switch should light up.

At this point, I suggest you re-read the instructions (just in case?) and then swap the switch for another one ... or get different brand.

Pass & Seymour... | Answered on Nov 04, 2010

If you are replacing a three way switch with a three way switch, you should only use the wires that were connected to the old switch. (Unfortunately the color coding of these wires is not universal.) Assuming you have only 2 switches, that means you only need to connect 3 wires to the switch (in addition to the ground). One wire (to be connected alone on either side of the top or bottom of the switch) either comes from the electric panel or goes to the light fixture. The other two wires (both at the top or bottom of the switch) are the "travelers" and go directly to the other switch. You can examine the other switch (the one you aren't working on) to confirm which two wires are your travelers. I hope this helps. Good luck!

Pass & Seymour... | Answered on Aug 04, 2010

No it will not.

Pass & Seymour... | Answered on Oct 07, 2017

Sounds like you have your wires crossed and are turning the power off.

Pass & Seymour... | Answered on Oct 07, 2017

The tab will snap off by grabbing it with needle node pliers. the tab is for a common feed to both the 3way and single pole switches.

Pass & Seymour... | Answered on Oct 07, 2017

You should have three screws. The two screws the same color are for the switch legs going out. The odd colored screw should be for power in.

Pass & Seymour... | Answered on Oct 07, 2017

Hot wire to brass-colored screw
Neutral to silver colored screw


If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Pass & Seymour... | Answered on Oct 02, 2014

Use the identified screw (different color then the other two) and any one of the other two. I do not know what switch you have but I assume the two identecial screws are on the same side. Put the one with the wire down, then hopefully when the switch if moved up it will turn or, if backwards just rotate the switch.

Pass & Seymour... | Answered on Apr 29, 2014

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