Unit [url=http://www.lowes.com/pd_293717-14-100HFL_0__?productId=3031001&Ntt=]Shop Broan 2-Sone 100-CFM White Bathroom Fan with Heater and Light at Lowes.com[/url] Switch [url=http://www.lowes.com/ProductDisplay?partNumber=26546-14-P66W&langId=-1&storeId=10151&productId=1076153&catalogId=10051&cmRelshp=rel&rel=nofollow&cId=PDIO1]Shop Broan Polypropylene Bath Fan Switch at Lowes.com[/url] Helping friend install this bath ceiling unit. Ran a dedicated 20amp circuit using 12/2 w/g to switch box. From switch box ran one 12/2 w/g for the heater portion. From switch box ran one 12/3 w/g for the light and fan portion. (Ran 12/3 instead of 12/2 because he had enough 12/3 but not 12/2) Wiring at switch box Incoming hot (12/2 black) to line (brass) screw on switch Wire nut all neutrals Silver screw #1 (12/3) red to vent (blue wire on unit) Silver screw #2 (12/3) black to light (black wire on unit) Silver screw #3 (12/2 ) black to heater (red wire on unit) At unit made all connections as above Neutral wires at unit wired as 12/2 neutral to heater white 12/3 neutral to light/vent white (could have put these together but just kept them separate.) Installed breaker; energized circuit. First switch when flipped on worked, vent went on. Then turned it off. Second switch when flipped on, spark at switch. Not sure exactly where at the switch was a spark, was not looking directly at it. Breaker tripped. Reset breaker Second switch when flipped on again the light went on, no spark this time. Third switch when flipped on heater went on. Checked each switch position again and again by turning each one on and off again but did not trip the breaker this time. All the connections were tight so doubtful was that. Any ideas what may have caused this to trip the first time and then not trip again? Thanks

This project is in Shawnee, Kansas which is a part of Johnson County. Just planning the wiring for my basement finish. I have an area with HVAC, plumbing and an I-beam that will be framed with a typical soffit. It will run almost right through the center of the 500 Sq ft area I will be finishing. I plan to drywall the ceiling. Is it okay to use that soffit as a wire chase? I will be framing it with 2x4's running horizontally below the obstacles. The way I envision it the wires would lay flat across the top of the 2x4s providing 1.5 in of space between them and anything used to fasten the drywall to the ceiling. To further clarify, the way I have been told this works is that I would not have to fasten the electric cables to the soffit. They would just run through it, sit on top of the 2x4's until I reach the unfinished area. At this point I would run them to the electric box (likely through holes in the joists). Again, does this sound okay, or am I the recipient of some poor advice?