Question about Cooper Wiring Devices Motion Sensing Switch- 30 Feet

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I have a switch hooked up to a lamp that occasionally starts blinking, I know that there is a minimum load required, so I installed a 75 watt incandescent bulb. Still blinks occasionally. I have two other installations that work perfectly. I even tried another switch in the same location. What could this problem be ??? If, when its blinking, I turn it off and then back on, works ok.

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  • BoomerP Nov 09, 2010

    When you say "blinking", does it briefly turn off when the lights are on? Or briefly turn on when the lights are off? And how regularly (once per second, once per minute?)

  • calyong Nov 09, 2010

    once a second....goes from dark to dim then back to dark again...I would say "briefly turn on", but not full brightness


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What gives me pause on this is the fact that the problem stays with the application and that your other applications work OK.

What ths issue sounds like is a neutral connection issue.. Many of the Cooper sensor/switch products require a neutral connection to avoid the issue you're describing. If there was no neutral connection, the sensor would draw power, and then dump it out through the light fixture - causing the lamps to flash (like you're seeing). But if you add a neutral connection to the device, the sensor can dump it out through the neutral and not excite the light bulbs.

So why does it work in the other installations and not here? Well, one possibility is that maybe those other installations have a LOT of load (multiple fixtures) so that spike of current isn't enough to make them blink. The other possibility is that maybe there isn't a neutral connection in the box, or maybe the neutral connection was disconnected from the box. I struggle with both these answers especially since you were able to do it successfully in two other locations, but the problem mode you discuss SCREAMS neutral issue.

If you can't solve it by those means, I recommended replacing it with the Lutron equivalent, the MS-OP600M-WH (dimmer) or MS-OPS6M-DV-WH (switch). Neither of these device leak a lot of current and work without requiring a neutral connection.

Posted on Nov 09, 2010

Testimonial: "thank you very much for your answer. I'm ashamed to tell you I'm an electronic engineer and didn't think of that solution. Thanks again ! Cal"

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