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Potomac101 02-24-2008 02:33 PM

Arc Fault Breaker
 
continued:

OK - so I replaced a 20 A breaker w/ a 20 A AFCI just to be on the safe side. It has been working fine (and still tests fine at the panel). I've been using a 12 A miter box on the circuit along with a radio and a 60 W overhead light. Today, and there have been no wiring changes, the breaker flipped (even w/ no radio) twice as the miter box saw was winding up.

The saw is working fine in the same room on a different circuit (also AFCI), and I'll be through in a day or two and will never need to use the saw up there again.

Is it all right to use the circuit w/ lamps, maybe a computer, radio, other small junk and see if that flips the breaker, or should I be concerned that there is a serious problem?

I can't reason out why the breaker would work for a week and then flip unless it was a sensitivity issue with the breaker itself.

thanks,
potomac101

gregzoll 02-24-2008 02:53 PM

You do not need a ACFI for the circuit you have it on. The load from the Miter saw is causing it to fail and trip. If wanting to use the Miter saw, place on a separate circuit with a regular breaker, but use a GFCI outlet.

Potomac101 02-24-2008 04:10 PM

Sorry - I didn't make that clear. The AFCI is in a new bedroom where I've been cutting trim.

So it's normal for something like a miter saw to trip an AFCI?

CowboyAndy 02-24-2008 05:11 PM

When I was remodeling one of our bedrooms, 20AMP AFCI protected I had no problems at all using my miter saw, although I am not sure I how much it draws. I never had an issue running it or a table saw or other power tools with my 500watt work lights and the radio going.

InPhase277 02-24-2008 07:11 PM

Quote:

Originally Posted by Potomac101 (Post 101281)
Sorry - I didn't make that clear. The AFCI is in a new bedroom where I've been cutting trim.

So it's normal for something like a miter saw to trip an AFCI?

This is why, aside from the price, that I hate these damn shams. Junk. It may be that you have an overly sensitive breaker. But the arcing from the brushes in the saw may be causing the nuisance tripping.

InPhase277


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