06-26-2012 08:50 AM
Recently I purchased this occupancy sensing switch:
The instructions say that a ground is required. I suspected that my wiring might be lacking a ground but I didin't think it would be very hard to fish a wire to make the connection. So far I have had no luck getting my fish tool through my wall. I suspect that this part of my house is framed differently than other parts with ballon framing and wide open stud access from the basement. I still have some tricks up my sleve and may yet be able to get through the sill plate to make get a wire through.
I'm wondering, how important is the ground connection for this device? How does it work? Is it a safety issue alone or does it affect the fuction of the sensor somehow?
06-26-2012 10:55 AM
06-26-2012 02:10 PM
Hello DGray. Welcome to the Community!
The instructions do say that a ground is absolutely required for the unit to function. It seems to me that the sensor needs a very small amount of current in order to work. Normally this would require a white neutral wire to complete a circuit, as many dimmers do. For some reason this neutral is not required, but a ground is.
Click on the above picture to read the instruction sheet.
You may well have a grounded switch box. Since you mention trying to fish wire, then I assume you have wiring through conduit, which may be grounded. Try using a multimeter to test for ground.
If you indeed do have a grounded box, simply attach the ground wire to it with a ground screw.
I hope this helps,
I'm a Home Depot Store Associate, trained and authorized to help people on the Internet.
06-27-2012 10:36 AM
As I stated prior the sensor WILL work without the ground::
Wiring Directions for this sensor stated below
When no “grounding means” exist within the wallbox, then the NECR 2008,
Article 404.9 allows a dimmer without a grounding connection to be installed as a
replacement, as long as a plastic, noncombustible wallplate is used. For this type of
installation, twist a wire connector onto the green ground wire or remove the green
ground wire on the Electronic Dimmer and use an appropriate
wallplate such as
R or Satin ColorsR series wallplates by Lutron.
06-27-2012 03:52 PM
Thanks for all the help guys. I tried installing the sensor last night and it wouldn't work. I reinstalled the regular switch and everthing worked fine.
Could it be that the sensing switch is bad?
06-27-2012 05:26 PM
anything is possible, its very easy to instal as you can see. Just return it to the store, get a new one and try it again.
12-17-2012 10:53 PM
I'm having the same issue, and have tried several differnent occupancy switches within this brand. A regular switch works just fine, but the occupancy switch does not. I do not have a ground wire (though the conduit should act as a ground when properly done) and no neutral (as this sensor does not have one either). I only have a wire to the light and to the breaker.
So - what do I do? The instructions say that the ground MUST be properly connected for the switch to work, but I don't know why or how that is. Please advise!
01-02-2013 03:26 PM
I was having the same problem. My lights were working, but they would not turn off. In my switch box, I had two black wires and two white wires that were tied together. I spoke with a licensed electrician who advised me to take the ground wire and bare wire from the Maestro sensor and tie them together with the existing two neutral white wires. PROBLEM SOLVED!
01-02-2013 03:39 PM
I was having the same problem. My lights were working, In my switch box, I had two black wires and two white wires that were tied together. I spoke with a licensed electrician who advised me to take the ground wire and bare wire from the Maestro sensor and tie them together with the two neutral white wires. PROBLEM SOLVED!
04-15-2013 04:15 PM
Note that older sensor switches did not use Neutral or Ground, but drew their standby current through the load (essentially like a dimmer set to a very low setting). This makes CFLs flicker and may not work at all with very low-watt loads; also it's a safety concern when changing a bulb in a supposedly-off fixture. Recent designs don't do that, and so require Neutral (or Ground) to complete the standby circuit.