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Nhrafan 04-02-2008 05:33 PM

Breaker box
 
Is there any standard as to how a breaker box needs to be mounted in a residential application?
Reason I ask is I would like to mount one sideways surface mounted on the wall.
It is a 200A panel with 40 spaces.

Also what is the standard mounting height?

Thanks.

chris75 04-02-2008 05:39 PM

1 Attachment(s)
Attachment 2969
Here is one reason...

joed 04-02-2008 06:45 PM

That's a big difference between NEC and CEC. It is common to mount a breaker panel on its side in Canada. We can also have more than 42 breakers in one panel.

Nhrafan 04-02-2008 06:46 PM

Quote:

Originally Posted by chris75 (Post 113303)
Attachment 2969
Here is one reason...


What is this supposed to mean?
I looked up the section and all I can find is this:

"240.33 The first sentence of this section has been rewritten to permit enclosures for overcurrent devices to be mounted in other than a vertical position when it is not practical to do so."

Jim Port 04-02-2008 07:19 PM

On must be Up. This precludes the mounting of panels on their side.

The middle of the handle of the highest breaker can be no higher than 2 meters or 6'7".

goose134 04-02-2008 08:20 PM

Actually it doesn't preclude mounting them on their side, but it does eliminate half of the panel.

nap 04-02-2008 08:27 PM

Quote:

Originally Posted by joed (Post 113324)
That's a big difference between NEC and CEC. It is common to mount a breaker panel on its side in Canada. We can also have more than 42 breakers in one panel.


as soon as '08 code is adopted, we can too.

Nhrafan 04-02-2008 08:35 PM

Another ? I have is this...

Is there a limit to how many double pole breakers that can be installed in a 40 circuit box?

I ask because I have radiant heat and each room is a separate zone so I have seven 20A double pole breakers already plus the one for the oven, the range top, water pump, the welder, and the portable heater outlet in the garage.

So I am wondering how many are allowed in a box and if there is a limit.

nap 04-02-2008 08:36 PM

Quote:

Originally Posted by Nhrafan (Post 113380)
So I am wondering how many are allowed in a box and if there is a limit.


I would have to say

20

220/221 04-02-2008 08:38 PM

Quote:

Is there a limit to how many double pole breakers that can be installed in a 40 circuit box?

That would be 20 :thumbup:

Nhrafan 04-02-2008 08:40 PM

Thanks guys!

I appreciate it.

Jim Port 04-02-2008 09:36 PM

Unless the panel is listed for use with tandems the answer could be zero.

What is the brand and part number of your panel?

CowboyAndy 04-03-2008 07:17 AM

Quote:

Originally Posted by Jim Port (Post 113405)
Unless the panel is listed for use with tandems the answer could be zero.

What is the brand and part number of your panel?

Why would the answer be zero? If the panel was listed for 40 circuits, then 20 dp breakers could be installed.

Jim Port 04-03-2008 07:41 AM

Andy,

I disagree, the panel label will show if and where the tandems can be used. The 40 circuit panels I have seen and installed do not allow tandems. The mounting rails will not allow the use of CTL (circuit tandem limiting) breakers. Use of non-CTL breakers are listed for replacement use only.

A panel like a QO200M3040 takes 30 full size breakers but can use 10 tandems to makeup the 40 circuits. The devil is in the details.

On a side note why use a breaker than is more than double the cost over a single?

hpp58 04-03-2008 07:49 AM

The question was "how many double poll breakers could fit?"
Tandems are not double poll breakers.


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