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Joined: Jan 2005
Posts: 10
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How do you figure out how many breakers you can fit on a 100,150,200 amp panel?
Thanks for any info.......
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Joined: Jul 2004
Posts: 625
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Isn't it printed on the labels of your panels? It should be.
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Joined: Jan 2005
Posts: 10
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let me reword it,if you have a 100 amp panel, how do you know how many 15 or 20 amp breakers you can use?
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Joined: May 2003
Posts: 2,876
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12/24 + 12 full size, or 24 1/2 size. Same for 20/30, 8/16, 30/36, 30/42
If not marked in that way it would be marked with how many spaces or (30/30 all full size), as would be any panel that half size aren't made for like bolt ons. i.e. a 24, 30 or a 42.
I heard that in Canada you can get 84?
Mark Heller
"Well - I oughta....." -Jackie Gleason
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Joined: May 2003
Posts: 2,876
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Oh how many can you fit of 15 or 20's. You can fill it up! Even throw some 50's or larger and feed another panel from it.
So long as the load calc is OK, maybe that is what you're really looking for.....
Mark Heller
"Well - I oughta....." -Jackie Gleason
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Joined: Oct 2004
Posts: 72
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NO MORE THAN 42 OTHER THAN THE MAINS
408.15
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Joined: Jan 2003
Posts: 4,391
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Local3Jr never more than 42 overcurrent devices in one enclosure (excluding the main)
But you can have as many breakers as you want connected to any service.
100 amp service go ahead and install ten 42 circuit sub panels and fill them up with breakers.
The only thing that matters is that the calculated load is less than the service size.
Say you are planing to wire a house in the 'normal' way with the code minimum circuits and the calculations show a 100 amp service will do the job.
Now the future homeowner says they want every receptacle, switch and appliance on it's own circuit.
To do this you will need a few sub panels and lots of breakers but the calculated load remains the same. The 100 amp service will still be fine.
Bob
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Joined: Jun 2004
Posts: 613
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e57...I recently read the label on a 200 amp Cutler Hammer loadcenter that did specify 84 overcurrent devices in Canada.
But why would the same panel used in Canada be able to handle 84 breakers with out failure?
shortcircuit
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Joined: Jun 2004
Posts: 613
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note...408.15 has disappeared in the 2005 NEC... wait a minute...its at 408.35 now ![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif) shortcircuit
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Joined: Jan 2005
Posts: 10
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Sorry for the confusion guys,lets say you have a 100 amp 3 wire panel(a phase,b phase and a neutral. Each leg is 100 amp right? You wouldn't be able to load it up with 42 20 amp breakers right? Maybe I am looking for some kind of calculation. Thanks again
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Posts: 362
Joined: April 2003
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