As I m sure some of you know from the other thread, I have been trying to install these occupancy sensors in my house. I actually successfully installed 2 more in boxes with no ground wires (BX cable - only black and white cables in) by pigtailing a ground cable to the box with the ground screw. I checked with the multimeter and it shows 120V between hot and the box and indeed the thing works. Anyways, all was going well but one of the switches in the basement, the original one I wanted to upgrade, kept bugging me. Because that switch had no ground wire (this is a 12-2 cable but ground wasnt connected), I actually pulled a ground cable from an adjacent receptacle which is in a different circuit and yet the thing still didn't work. Today I decided to investigate that other circuit I pulled the ground wire from and to my surprise (or not), the adjacent receptacle (not the one I pulled ground from), had its ground wire cut. This circuit has only 3 receptacles. Its a 12-2 wire and I dont understand why the middle receptacle had its ground wire disconnected. Anyways, I fixed the cut ground connection, and VIOLA my sensor started working. All happy, I tucked the sensor in and everything connected. I turn on the circuit breaker and BAM sparks coming out of the sensor box. I immediately shut off the circuit breaker and saw that the white wire (return) had its insulation and mind you a very very small amount of it, scraped against the box and as a result the corner of the box and wire all turned black. But the sparks that came out was quite a lot, it was not a small amount of spark. So obviously I replaced that white wire and turned on the circuit breaker again and this time my entire breaker box started making a very loud humming noise and while I wasn't near box at all, but I could see small amount of light coming from the box (my circuit box is behind the furnace, so you cant really see it unless you are next to it). Its like someone put a small flashlight in that corner of my basement. I dont know if it was sparking at the box (why would it?). Next I went near the sensor and sensor itself now smells like burnt plastic. I realized maybe the first incident fried the sensor. I had a spare one, I put that one in, again new cables, etc and viola, everything went back to normal. The one thing I did different this time was that I didn't ground the box. The last time I had a ground screw on the box itself and when the white wire sparked it, I said maybe since sensor uses ground and passes a small current, grounding this box maybe an issue. Now I apologize for the long post but this entire thing is a puzzle to me and I need someone to help me understand the following: 1) Could there be more to this than the scraped white cable's insulation shorting the box? Could the white cable melt and as a result short? 2) Why on first (spark in the box) and second (loud humming noise and possible spark in the circuit breaker box) the breaker did not go off. This is what concerns me so much. 3) Right now everything works. But I am very scared this is going to cause a fire somewhere. I dont know if this happened because of me fixing the cut ground cable and pulling the ground from another circuit (but why would it? Ground is ground it doesnt matter which circuit its coming from). Need some help here, I apologize again for the long post. The good news is at least things work, I now have 4 occupancy sensors, including a 3 way, working in my house. But I dont want to burn the house down.

I do not have much electrical experience, but all I simply would like to do is wire up this Dayton 6K778BG Blower Motor so I can use it for a ball mill to polish my brass. I would like to plug it into and outlet, but I'm confused on the motor wiring. Looking at the pictures, do I connect the hot wire to the brass or silver bolt or do I use female connectors on the prongs right next to the bolts? The diagram on the motor confused me, so I thought I might as well ask before I do something wrong.