GFCi protected duplex receptacles.

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nizak

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Does anyone here know the # of 120v duplex receptacles that can be protected by 1 QO single pole GFCI breaker? It may even say in the spes sheet, but I don't have one in front of me at the present. Thanks.
 
nizak said:
Does anyone here know the # of 120v duplex receptacles that can be protected by 1 QO single pole GFCI breaker? It may even say in the spes sheet, but I don't have one in front of me at the present. Thanks.
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There really is no limit but if it is a commercial job you will be limited by the 180va/recep.
 
I didn't know if there may be some issue(other than obvious overloading of the circuit) that would play into the performance of such a breaker. As a for instance, the 120V/ 9VDC smoke alarms that I use say that they can be interconnected with up to 18 units. Thanks
 
The first of my two links has a footnote about no more than 250' of load-side wiring, but I can't see where that is tied to the GFI breaker.
 
can't see where that is tied

can't see where that is tied

Capacitance per foot (~100 pF/ft?) of Romex will cause reactive current to ground. For 4 mA of reactive leakage, the C necessary is = 0.004/(120x377).
 
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Lxnxjxhx:

You have a good point. From your figures I get 1000 ft. If there are high frequency components the distance would be shorter.

I have never measured Romex but your suggestion is reasonable.

.
 
Lxnxjxhx said:
Capacitance per foot (~100 pF/ft?) of Romex will cause reactive current to ground. For 4 mA of reactive leakage, the C necessary is = 0.004/(120x377).
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Add into that some of the more organic leakages in utilization equipment and wiring devices, and it might be best to limit the branch circuit length to something closer to 250' rather than the mathematical 1000'. Even a brand new appliance is permitted to have 3/4 of a ma leakage right out of the box.
 
Dennis Alwon said:
There really is no limit but if it is a commercial job you will be limited by the 180va/recep.
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Are you doing a load calc or an install. I know we have been down this road before. I don't see why we have to use 180VA other than for calcs.


210.14(I) Receptacle Outlets. Except as covered in 220.14(J) and (K), receptacle outlets shall be calculated at not less than 180 volt-amperes for each single or for each multiple receptacle on one yoke. A single piece of equipment consisting of a multiple receptacle comprised of four or more receptacles shall be calculated at not less than 90 volt-amperes per receptacle. This provision shall not be applicable to the receptacle outlets specified in 210.11(C)(1) and (C)(2).
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nizak said:
As a for instance, the 120V/ 9VDC smoke alarms that I use say that they can be interconnected with up to 18 units.
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I believe that has to do with one unit's ability to drive the horn in 17 additional units.
 
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