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Old 09-11-2017, 09:13 PM   #1
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Default What are the requirements for the dimension wall in the building code?

like we cannot put the electrical panel in the dimension wall,

what else?anybody knows?
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Old 09-11-2017, 09:14 PM   #2
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like we cannot put the electrical panel in the dimension wall,

what else?
What's a dimension wall? Is this a Canadian question? Because there is a section for that.
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Old 09-11-2017, 09:35 PM   #3
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You mean a common wall between two units?



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Old 09-11-2017, 09:41 PM   #4
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like we cannot put the electrical panel in the dimension wall,

what else?anybody knows?
It dont matter if Canada or America code question but make it more clear on dimension wall.,,


if you are talking about common wall spacing most places are on 16 inch on centre or 40CM on centre unless noted otherwise.

common wall between duplex or others will varies a bit depending on building code requirement .,,
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Old 09-11-2017, 09:44 PM   #5
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You mean a common wall between two units?



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yes................
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Old 09-11-2017, 10:01 PM   #6
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Are you concerned with the Canadian Electrical Code or the Canadian Building Code ....? In BC many places will not approve you placing the electrical panel in a carport ; for instance. And many municipalities have their own set of rules that they like the contractor to follow.....as well as the CEC.
It's an open book ....depends and depends !
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Old 09-12-2017, 01:01 AM   #7
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Mike means demising wall.

The lad ought to enter an apprenticeship program, ASAP.

His queries are those you'd ask your j-man or foreman.
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Old 09-12-2017, 06:26 AM   #8
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I think demising walls are different than fire walls.
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Old 09-12-2017, 07:22 AM   #9
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I think demising walls are different than fire walls.
I think a demising separates tenants and in most cases will be a firewall; but there are firewalls that are not demising walls.

I don't know if it's codified anywhere but you'll see them construct the firewall with a little alcove in it for the panel to go in. There's still a layer of drywall between the panel and the void in the wall. This way the panel isn't really inside the firewall, it's really sitting on it, even though the final appearance is a flush mount.
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Old 09-12-2017, 07:28 AM   #10
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I think a demising separates tenants and in most cases will be a firewall; but there are firewalls that are not demising walls.

I don't know if it's codified anywhere but you'll see them construct the firewall with a little alcove in it for the panel to go in. There's still a layer of drywall between the panel and the void in the wall. This way the panel isn't really inside the firewall, it's really sitting on it, even though the final appearance is a flush mount.
Bingo.

I've never seen a demising wall that was not fire rated.

But, maybe that's just a Californian 'thing.'
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Old 09-12-2017, 09:26 AM   #11
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I would run 500MCM copper.
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Old 09-12-2017, 09:40 AM   #12
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Bingo.

I've never seen a demising wall that was not fire rated.

But, maybe that's just a Californian 'thing.'
I think that's pretty universal.
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Old 09-12-2017, 09:42 AM   #13
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I would run 500MCM copper.
Wrong thread?


That would be the world's most expensive demising wall.
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Old 09-12-2017, 09:54 AM   #14
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I think that's pretty universal.
Is it?

I thought one (fire wall) had to have fire rated insulation (rotten cotton) in it?

And demising wall could use fiberglass bat.
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Old 09-12-2017, 10:09 AM   #15
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Is it?

I thought one (fire wall) had to have fire rated insulation (rotten cotton) in it?

And demising wall could use fiberglass bat.
There are different time ratings for demising walls depending on construction and if the space is sprinklered or not.

The more protection the less flame spread time required.

Rotten cotton does not a firewall make.
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Old 09-12-2017, 10:31 AM   #16
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The building plan specifies the type of construction and the fire rating of walls. For wood frame the usual deal is unrated, 1 HR and 2 HR construction. Many buildings are rated as 1 HR throughout. So if you end up installing the panel in a rated wall you have to maintain the fire rating. The code allows a total of 100 sq in of opening in 100 sq ft of wall with max 16 sq in opening size. So it is common to box in the opening with drywall and then set the panel inside. You have to firestop all the cables as they come through the drywall into the panel. Best solution is to put panel somewhere else, but not always possible.

Have the drywall contractor box in the panel opening leaving at least 6 inches top and bottom so you can firestop the cables. Then they can put the finish layer on.
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Old 09-12-2017, 10:53 AM   #17
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Have the drywall contractor box in the panel opening leaving at least 6 inches top and bottom so you can firestop the cables. Then they can put the finish layer on.
They may have to bump up to 6" studs spaced 24" to make room for the panel. If there's a drop ceiling or otherwise access to the ceiling, it will definitely make sense to stub up to a junction box in the ceiling.
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Old 09-12-2017, 11:02 AM   #18
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They may have to bump up to 6" studs spaced 24" to make room for the panel. If there's a drop ceiling or otherwise access to the ceiling, it will definitely make sense to stub up to a junction box in the ceiling.
That's about the most common in jobs I've been on.
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