3-way switch wiring question

brightlight

I'm changing a light switch which is part of a 3 way wiring setup.

I'm only changing one switch out of the two already there.

I'm confused as to what wire is for what and my new switch has a lot of wires (its a fancy movement detector).

Any help would be appreciated.

First picture is of the switch to be replaced.

Second picture is of the "other" switch in the 3 way setup.

Third picture is of the new switch

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k_buz

You may not be able to use motion sensor in the box you want to. By looking at the wiring of the switches, it doesn't appear that you have a constant hot in that location. I think you only have a switch leg and travelers available.

Do you need the 3 way set up? You could rewire the switches so your motion detector is the only thing that switches the light.

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k_buz

Could you post the manufacturer and model #?

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brightlight

Cooper Wiring Devices

OS310U Auto On Sensor (Single Output)

Here are the instructions that came with it.

k_buz

Thanks, I am going to need a little help on this one as it is showing you to put the neutral in the first box (second picture) to one of the traveler screws. That just doesn't make sense. You are not allowed to switch a neutral per NEC.

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brightlight

I'm in Canada, does that change something?

MisterZ

i agree, the instructions are a bit misleading i think.

the way i see it, find the two wires (Red and Black) that come into the switch box together (paired wires)
This Black wire would nut onto the Blue traveller, and the Red would nut onto the Red traveller.
Now you have your other black, which goes to Black, and neutral and ground to their respective neutral and ground nuts.

correct me if this sounds wrong.

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brightlight

Thanks for your help guys, but I just returned the switch to the store... :-(