Just finished rewiring my kitchen, and everything on all 5 circuits works fine with one exception, my 3 ways that control my 3 pendants in the ceiling. One 3 way will light the pendants, the other will throw the breaker. They are wired correctly at the switches. I changed the switch that trips, no difference. I brought the source up to the first ceiling box (This is a lighting circuit) and wired the source hot directly to the first run of 12/3, white to the other run of 12/3 and red as well. The lights took the neutral, and I pigtailed the hot lines together going to the lights and the other run of 12/3. Everything in this circuit works, cannisters over the sink, pendants, entry lamps, chandalier. But just flip that 1st 3 way and the breaker trips. I'm sure I have made a simple mistake somewhere, but the 300 feet of line and numerous devices installed may have made me stupid, so please advise me of the obvious, what ever it may be! The first box also has the line to my cannister lights spliced in with the source.

Hopefully, I never run into the clown that inspected my house. Just finished digging down around my septic tank for a new pump and pipe repairs. Finally took care of the mouse problem. The leaking roof is still on the agenda, among some other things I have to take care of. Anyway, built a shed about 25 feet away from house last year. I ran and buried the wire during ground work. Before running it to the main figured I'd pick up a sub panel for my garage and do it all at once. The sub panel is 100 amp and has HOM & C circuit breaters. It was a main panel that I'll have to get a grounding bar for. My garage is attached but apparently was added on 2 years later, after the house. Some idiot fed the garage through the outside flood lights' circuit. My 110 5hp compressor or 110 mig, depending on the temperture of the garage will trip the circuit. Presently running in the garage is a freezer and a spare "beverage" ;) fridge. It has (4) 4' flourescent shop lights and (2) up in the attic I built above. Table saw or grinders can also trip the circuit. Eventually plan on blowing the garage back another 12-16 feet. The garage now is 24x24. Will also need to heat it as well. Planning on temporarily putting up another shed behind the garage to house a 3 phase 80 gallon, 5 hp 2 stage IR compressor along with it's 7.5 hp rotary phase converter. Power will have to come from the sub panel as well. I went down to the municipal building for a permit for the sub panel. Apparently I only need one for my additional shed, which is much more important to them. :rolleyes: The garage's lighting and recepticles are wired correctly, just the feed is the problem. Now I got around to running the shed circuit up to the main. I looked up what kind of breakers I have and researched. I have a FPE 200a stab-lok main. :mad: Apparently I'm probably better to replace this ASAP rather than wait and hope nothing bad happens. Hopefully, I explained the situation well enough. Sorry for the book...Questions: 1) What size wire is required to feed the 100 amp sub panel, approximately 75 feet, at 100 amps? 2) Should I pick up a 200 amp main panel with HOM circuits breakers to be the same as the 100 amp sub panel? Maybe there is something better? 3) I've done wiring before but not comfortable with playing around live wires. I know I could label the individual circuits, remove and swap in the new box. However, would rather be able to cut off the feed to the house. Is this best left up to the electric company or would I need an electrician? If the meter box didn't have a tamper-proof seal on it, I would've looked in there today. 4) When selecting breakers, does the 125% rule always apply, even for compressors and welders or is it larger? I realize the ampacity of the wire will also have to be correct for the breaker.