Trick you have a connection between the neutral and a ground someplace in your circuit. When current is drawn at this point in the circuit, the afci kicks off. Happy hunting, and please don't yank the afci's until the code allows it. (probably a matter of time)
#63204 - 03/11/0602:17 AMRe: AFCI Tripping under loads
I ran into this once too, but my problem was simple. Hopefully your's will be this simple.
AFCI would trip when any load was applied. I pulled apart connections ensuring a good connection and everything checked out fine. I thought I would try another breaker, and when I went to remove the breaker with the wires still in, the black wire was loose. The wire was actually behind the lug in the breaker, so the screw wasn't compressing it. I put the wire in properly (and also checked the other breakers, which were fine) then tested the circuit......no more tripping. Sometimes the obvious can stump you.
"Will it be cheaper if I drill the holes for you?"
#63205 - 03/11/0607:15 AMRe: AFCI Tripping under loads
A standard part of AFCI breakers is ground fault detection. Unless it is a combination AFCI/GFCI, the 'pickup' level will be much higher than in a GFCI, but it is still ground fault detection, and a neutral to neutral 'fault' will trip the device.
#63207 - 03/11/0611:35 AMRe: AFCI Tripping under loads
Reno, I keep hearing about fans, dimmers, ballasts, etc, and I believe you about it, but I myself have yet to have witnessed any problems with any of the above items causing trips on an afci. One thing I have seen though is older, well used multi plug surge protector strips that were causing false trips on the afci bedroom circuit. Replacing those fixed the problem.
#63209 - 03/11/0605:13 PMRe: AFCI Tripping under loads
Mac, perhaps I ought to explain my statement a bit. With AFCI's, I have had but one circuit (out of maybe 20) that instantly tripped the AFCI, yet otherwise seemed perfectly OK. As you might guess, this was on a lighting circuit that had lots of dimmers. I also have had a dimmer switch once fool a GFI into thinking there was a problem.
My general statement about fans, ballasts, and dimmers (as well as surge supressors, and a few things I can't remember) comes direct from the local Cutler-Hammer rep.
Recently, I did some work in a new home that, disregarding the NEC, had only the bedroom receptacles on AFCI breakers. Since our local code pretty much follows the NEC, I can only conclude that the inspector failed to notice this. I'm also willing to bet the tract developer did it deliberately, so as to avoid call-backs.
#63210 - 03/11/0610:41 PMRe: AFCI Tripping under loads
C-H and SqD have list of "Known Equipment Conflicts" i.e. items that just plain ol' won't work no matter what you do. You can call and ask if an item is on thier list, and thier reply is "well sorry..."
Things I have found that wont work are Vaccum Cleaners, most like variable speed motor contols in say power tools and the like, some brands and makes of plasma and LCD screens (TV's and monitors), and yep some dimmers and other types of controls. I have torn my hair out looking for some of the "wiring defects" that could cause a trip, only to find that some breakers just wont work with some things. Now I just call before I go any further. As most of those things will trip right away...
IMO these things are still in thier infantcy, remember it took years for them to get a GFI that worked well with some things.
SqD actually told me that I had to get a newer lot number, and had to get it shipped from them because it had not made it into the supply system yet. Charged me for it too.
Mark Heller "Well - I oughta....." -Jackie Gleason
#63211 - 03/12/0609:59 PMRe: AFCI Tripping under loads