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How many breakers? #48723
02/18/05 09:44 PM
02/18/05 09:44 PM
L
Local3Jr  Offline OP
Member
Joined: Jan 2005
Posts: 10
Wantagh,NY
How do you figure out how many breakers you can fit on a 100,150,200 amp panel?
Thanks for any info.......

Work Gear for Electricians and the Trades
Re: How many breakers? #48724
02/18/05 09:46 PM
02/18/05 09:46 PM
S
SolarPowered  Offline
Member
Joined: Jul 2004
Posts: 625
Palo Alto, CA, USA
Isn't it printed on the labels of your panels? It should be.

Re: How many breakers? #48725
02/19/05 12:02 AM
02/19/05 12:02 AM
L
Local3Jr  Offline OP
Member
Joined: Jan 2005
Posts: 10
Wantagh,NY
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?

Re: How many breakers? #48726
02/19/05 12:07 AM
02/19/05 12:07 AM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
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
Re: How many breakers? #48727
02/19/05 12:11 AM
02/19/05 12:11 AM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
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
Re: How many breakers? #48728
02/19/05 02:01 AM
02/19/05 02:01 AM
B
bucketman  Offline
Member
Joined: Oct 2004
Posts: 72
vancouver WA, USA.
NO MORE THAN 42 OTHER THAN THE MAINS
408.15

Re: How many breakers? #48729
02/19/05 05:08 AM
02/19/05 05:08 AM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
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
Re: How many breakers? #48730
02/19/05 05:50 AM
02/19/05 05:50 AM
S
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
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

Re: How many breakers? #48731
02/19/05 06:18 AM
02/19/05 06:18 AM
S
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
note...408.15 has disappeared in the 2005 NEC...

wait a minute...its at 408.35 now [Linked Image]

shortcircuit

Re: How many breakers? #48732
02/19/05 09:29 AM
02/19/05 09:29 AM
L
Local3Jr  Offline OP
Member
Joined: Jan 2005
Posts: 10
Wantagh,NY
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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