I only have (2) wires in my junction box. I do not have a ground and this sensor works. Most sensors require a ground. This will save you time & $$..
I am running a four light restroom light fixture and I have CFL bulbs in them. I put in a Lutron MSCK-OP153MH-WH. This is an occupancy sensor with dimmer. Once hooked up, the lights came on and off (off completely). I only have two wires in my junction box. No Ground wire was used. NOTE: because this is a dimmer Lutron switch, my CFL bulbs are a bit louder than usual. Please be willing to deal with a slight louder buzz than normal from the CFL bulbs. I am planning on switching out the CFL bulbs as soon as my 16 pack of 100W equivalent 13w used LED bulbs come in the mail so the noise from the CFL bulbs aren't a factor. I can only hope that the LED bulbs aren't as loud as the CFL non dimming bulbs are.
Buyer Be Ware. I also purchased the Leviton IPS06 motion sensor switch at the same time. I called Leviton and specifically told them that I only had (2) wires in my junction box (No Ground). The IPS06 is the one they recommended. There is a huge problem. I hooked up the IPS06 and I was excited that I was able to use a motion sensor without having a ground. However, once the light went out (turned off), I noticed that 2 out of 4 of my CFL bulbs were still flickering. 10 minutes later, they were still flickering. I took the Brand New in the box Leviton out and replaced it with this Lutron MSCL-OP153MH-WH and it worked just like any other motion sensor. Keep in mind, Most Motion Sensors Require A Ground so being able to use a motion wall switch sensor is huge for me. I Strongly Recommend That You Use Dimmable Bulbs to be able to maximize the capabilities and functions of this dimmer switch. To put it another way, Non Dimmable Light bulbs, florescent tubes and/or any other lighting that is not "Specifically" labeled as dimmable will not dim even with this dimmer switch. PLUS the bulbs will make a loud buzzing sound and potentially over heat. If you choose to use this dimmer switch without a dimmable bulb, keep the light switch setting to 100% full power. Although I strongly suggest you purchase some dimmable bulbs should you choose to buy this (or any other) dimmable switch of any kind.
PS
Read the instructions on how to change the timer, sensitivity, occupancy sensor etc...
It is not intuitive. You Must Read The Instructions.
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