Siemens Two Pole AFCI Circuit Breaker

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peter d said:
No, they are only listed for 240 volt use.
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Do you have specs on the Siemens that I can look at? I called tech support a few years ago with Sq. D and they told me and sent information saying Sq. D would not work on 208 volts.
 
Dennis Alwon said:
So what do all the apartments that are fed with 3 phases Y services do for afci protection
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I did a remodel in a condo last year that had a majority of the circuits run as multiwire branch circuits. The panel in each unit was a single phase 208/120 volt single phase Sq. D panel. I called Sq. D tech support and they stated that the 2 pole Sq. D AFCI circuit breakers would not work on 208v. I'm curious if Siemens 2 pole AFCI circuit breakers are the same?
 
peter d said:
Is this a trick question? :? It's 208.
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Yes so why did you say they were dp breakers. Someone can wire an apt with multiwire branch circuit and be stuck with needing dp breakers. I was surprised that if you wanted to add afci on an existing multiwire branch circuit that you could not do it in apts feed with 208V
 
Dennis Alwon said:
Yes so why did you say they were dp breakers. Someone can wire an apt with multiwire branch circuit and be stuck with needing dp breakers. I was surprised that if you wanted to add afci on an existing multiwire branch circuit that you could not do it in apts feed with 208V
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Because the double pole AFCI is limited to 120/240 volt circuits. We're arguing the same thing.
 
The only manufacturer that gives you a way out on a 120/208 panel that has MWBCs in it is G.E. and their Mod 3 breaker. You use two single pole breakers with their handle tie. Wire it to their spec, it is U. L. listed for that use.

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peter d said:
Because the double pole AFCI is limited to 120/240 volt circuits. We're arguing the same thing.
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I think Dennis' question is still unanswered though. If you're required to have AFCI breaker on a 2-pole circuit and the panel happens to be 208V, are you SOL if you didn't think to install a GE panel (per bsmith8691)?
 
jaggedben said:
I think Dennis' question is still unanswered though. If you're required to have AFCI breaker on a 2-pole circuit and the panel happens to be 208V, are you SOL if you didn't think to install a GE panel (per bsmith8691)?
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If you are adding a new circuit you obviously would not use a multiwire branch circuit and if you are extending the circuit then use an afci Receptacle. Probably not a problem.

I guess knowing this is good info for planning
 
bsmith8691 said:
The only manufacturer that gives you a way out on a 120/208 panel that has MWBCs in it is G.E. and their Mod 3 breaker. You use two single pole breakers with their handle tie. Wire it to their spec, it is U. L. listed for that use.

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But how do you connect the neutral of a MWBC?





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