ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Where is Everyone?
by gfretwell - 06/20/21 10:53 PM
Happy Father's Day!
by Bill Addiss - 06/19/21 04:16 PM
A Risky Setup
by timmp - 06/18/21 08:08 PM
Conduit over Vinyl Siding
by Jim M - 06/16/21 08:30 PM
Updated Forum Software
by Admin - 06/15/21 10:23 AM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
0 members (), 4 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#48723 02/18/05 10:44 PM
Joined: Jan 2005
Posts: 10
L
Member
How do you figure out how many breakers you can fit on a 100,150,200 amp panel?
Thanks for any info.......

#48724 02/18/05 10:46 PM
Joined: Jul 2004
Posts: 625
S
Member
Isn't it printed on the labels of your panels? It should be.

#48725 02/19/05 01:02 AM
Joined: Jan 2005
Posts: 10
L
Member
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?

#48726 02/19/05 01:07 AM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
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
#48727 02/19/05 01:11 AM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
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
#48728 02/19/05 03:01 AM
Joined: Oct 2004
Posts: 72
B
Member
NO MORE THAN 42 OTHER THAN THE MAINS
408.15

#48729 02/19/05 06:08 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
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
#48730 02/19/05 06:50 AM
Joined: Jun 2004
Posts: 613
S
Member
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

#48731 02/19/05 07:18 AM
Joined: Jun 2004
Posts: 613
S
Member
note...408.15 has disappeared in the 2005 NEC...

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

shortcircuit

#48732 02/19/05 10:29 AM
Joined: Jan 2005
Posts: 10
L
Member
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

Page 1 of 2 1 2

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 811
Joined: April 2004
Top Posters(30 Days)
Admin 10
Trumpy 8
Popular Topics(Views)
280,461 Are you busy
213,550 Re: Forum
200,419 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5