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-   -   AFCI trip when computer turns on (http://www.diychatroom.com/f18/afci-trip-when-computer-turns-33150/)

tonydiato 12-04-2008 12:17 PM

AFCI trip when computer turns on
 
New home that is about 4 years old. Just moved into it. My Mac trips this AFCI breaker when i turn it on. Never happened in the older home. These AFCI are all in the bedrooms. If i plug the computer into the living room, it does not trip the swtich. I even replaced the AFCI and it does the same thing. Can i just replace it without a AFCI? The AFCI has 3 wires where the regular 20 breakers have one line going to it. I understand the white wire doesnt need to be installed..but what about the red and black if I switch it to a regular breaker?

Gigs 12-04-2008 12:34 PM

It sounds like you have a wiring problem. I would not replace the AFCI with a regular breaker until you investigate the wiring further.

They do make 2 pole AFCIs but they are rare and I doubt your builder used one for a simple bedroom circuit.

Posting pictures might be a good way to go, thanks.

Gigs 12-04-2008 01:11 PM

I just thought of something, this could be a neutral to ground fault. Those will trip an AFCI only when you put a load on the circuit, because then it sees the current sharing. Try plugging a different device into the same outlet and turn it on.

Billy_Bob 12-04-2008 01:41 PM

The AFCI manufacturers want to know about these problems...

AFCI Unwanted Tripping Report...
http://www.afcisafety.org/report.html

Gigs 12-04-2008 02:39 PM

Quote:

Originally Posted by Billy_Bob (Post 193790)
The AFCI manufacturers want to know about these problems...

I'll bet you $5 it's not an AFCI problem.

rgsgww 12-04-2008 03:02 PM

I doubt its an afci problem.

Try different loads, like a space heater.

DO NOT replace the afci with a non afci, it violates the electrical code your house was wired under.

Maybe your psu is bad?

Red and black?

Please post pictures.

tonydiato 12-04-2008 03:03 PM

I did put other devices into the plug. Also I did move the computer around the room and plugged it into different soccets. Same thing. There are alot of people with Mac Pro computers that are having this problem.

Gigs 12-04-2008 03:11 PM

Try plugging it into a GFCI outlet and see if the outlet trips (like bathroom or kitchen).

It looks like Mac Pro power supplies might have ground fault problems.

rgsgww 12-04-2008 03:13 PM

Maybe an isolation transformer would help clear things up?

Gigs 12-04-2008 03:17 PM

Quote:

Originally Posted by rgsgww (Post 193836)
Maybe an isolation transformer would help clear things up?

Only if he runs the PC ungrounded, not a good idea because all PC SMPSs I've seen do leak a few ma current to ground.

It would need to be leaking 30ma+ to set off a regular AFCI though... That's dangerous levels.

I just looked and Mac Pros apparently can pull up to 12 amps too. 1000+ watts for a computer, heh. I doubt it's a straight load issue and would suspect ground current still, until proven otherwise.

rgsgww 12-04-2008 03:21 PM

Quote:

Originally Posted by Gigs (Post 193840)
Only if he runs the PC ungrounded, not a good idea because all PC SMPSs I've seen do leak a few ma current to ground.

It would need to be leaking 30ma+ to set off a regular AFCI though... That's dangerous levels.


Your right...he should try the gfci.

Maybe apple can actually fix this anytime soon.

rgsgww 12-04-2008 05:14 PM

Quote:

Originally Posted by Gigs (Post 193840)
Only if he runs the PC ungrounded, not a good idea because all PC SMPSs I've seen do leak a few ma current to ground.

It would need to be leaking 30ma+ to set off a regular AFCI though... That's dangerous levels.

I just looked and Mac Pros apparently can pull up to 12 amps too. 1000+ watts for a computer, heh. I doubt it's a straight load issue and would suspect ground current still, until proven otherwise.


My custom built pc pulls about 16 amperes...you need a 20 amp circuit.

I havn't seen many other psus like it. I think its an ultra brand. It also has a cable for people with 15 amp only, of course, it won't perform max. The cable has a circuit breaker built into it.

tonydiato 12-05-2008 07:34 AM

Trippin the switch
 
Since the AFCI switch only trips a couple times a week, do you think its the computer power supply on the mac or would it trip all the time if it was that part?

Its a seiemens switch. Can i just change that to a reqular switch?

theatretch85 12-05-2008 08:09 AM

Quote:

Originally Posted by rgsgww (Post 193937)
My custom built pc pulls about 16 amperes...you need a 20 amp circuit.

I havn't seen many other psus like it. I think its an ultra brand. It also has a cable for people with 15 amp only, of course, it won't perform max. The cable has a circuit breaker built into it.

You computer doesn't actively use 16 amps; that's a max load capacity, try putting an ammeter on it; I'll bet its more like 5 or 6 amps (it will be a little higher if you are in game than out of game). A buddy of mine just built a massive gaming rig with that same Ultra power supply, the 1600 watt. When I metered his system it was only a couple amps, and he has dual GTX280's and dual water pumps for his cooling system, not to mention a few drives in the computer.

rgsgww 12-05-2008 08:21 AM

Quote:

Originally Posted by theatretch85 (Post 194186)
You computer doesn't actively use 16 amps; that's a max load capacity, try putting an ammeter on it; I'll bet its more like 5 or 6 amps (it will be a little higher if you are in game than out of game). A buddy of mine just built a massive gaming rig with that same Ultra power supply, the 1600 watt. When I metered his system it was only a couple amps, and he has dual GTX280's and dual water pumps for his cooling system, not to mention a few drives in the computer.


I have two 9800 gx2s a few drives and a qx9650

I try crysis (game) and I don't pull that much. I am worried that I might as I am going to install a speaker system that may pull over 4 amps...

I don't like water cooling...kind of scary don't you think?


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