Occupancy sensor issue, Part Ii - Electrician Talk - Professional Electrical Contractors Forum
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Old 05-02-2018, 11:57 AM   #1
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Default Occupancy sensor issue, Part Ii

I was having occupancy sensor issues. The problems were random with no consistency to work with and troubleshoot. I phoned Lutron last week and we seemed to have the issues solved with programming and then they started acting up again.

I phoned Lutron again today and got a different tech. He said occupancy sensors are very sensitive to grounding (or bonding, whatever). My bond is EMT and the bare wire in AC90. When he heard I was using EMT, he thought he found the problem - higher than tolerable resistance. Are they that sensitive? Maybe so.

The test is to use the neutral wire rather than ground. I did this and they are now working, at least in test mode. The meter shows no break in my bond and the sensors were working, just not working propely. The permanent fix is to special order occ sensors with a neutral.

This isn't the first time I have had issues with devices that use the ground rather than neutral for the electronics. Try putting an occ sensor on a ground fault protected circuit and you will have nothing but trouble.

Last edited by 99cents; 05-02-2018 at 12:04 PM.
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Old 05-02-2018, 12:16 PM   #2
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When installed correctly, with locknuts and set screws tight to spec, emt will have less resistance than the insulated green conductor running thru it. I won't be able to pull up the study on this factoid readily, I had it on one of the other laptops I ruined with coffee just like how this one will if I keep this nonsense up parking my cup right smack dab in front of the thing. Of course that study was funded by the steel tubing industry so buyer beware.
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Old 05-02-2018, 02:40 PM   #3
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I'm waiting for Part III
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Old 05-02-2018, 03:36 PM   #4
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It's coming, Dave. I think what mac says is true.
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Old 05-02-2018, 03:52 PM   #5
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Quote:
Originally Posted by macmikeman View Post
When installed correctly, with locknuts and set screws tight to spec, emt will have less resistance than the insulated green conductor running thru it. I won't be able to pull up the study on this factoid readily, I had it on one of the other laptops I ruined with coffee just like how this one will if I keep this nonsense up parking my cup right smack dab in front of the thing. Of course that study was funded by the steel tubing industry so buyer beware.
It's called "The Georgia Tech Model" and it was funded by the Steel Tube Institute and presented to NEMA. It's been peer reviewed and repeated a couple of times since it came out, with identical results.

https://steeltubeinstitute.org/steel...2/GROUNDIN.pdf
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Old 05-02-2018, 08:03 PM   #6
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Here's Part III: Customer arrived and said screw it, put in normal switches. Problem solved .
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