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Commercial Areas And Mc

 
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Old 02-23-2016, 07:14 PM   #1
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Commercial Areas And Mc


When I first started wiring commercial areas were always required to be mc or ac. Now I see romex in commercial areas. When am I allowed to put romex in commercial areas compared to mc or ac?
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Old 02-23-2016, 07:15 PM   #2
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Re: Commercial Areas And Mc


When it's a combustible building.

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Old 02-23-2016, 07:29 PM   #3
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Re: Commercial Areas And Mc


Quote:
Originally Posted by Inner10 View Post
When it's a combustible building.
What does that mean?

I would think that all buildings are combustible to one degree or another.

Andy.
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Old 02-23-2016, 07:29 PM   #4
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Re: Commercial Areas And Mc


Quote:
Originally Posted by Inner10 View Post
When it's a combustible building.
Not in the US. In the US, you can install romex when it is completely concealed behind a fire rated wall (including ceilings), and when the building meets certain classifications for fire rating. Same way it's been for years. In commercial, it is a beeotch to meet the requirements, so you probably can't use it all the much.
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Old 02-24-2016, 08:48 AM   #5
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Re: Commercial Areas And Mc


Quote:
Originally Posted by ME2002 View Post
When I first started wiring commercial areas were always required to be mc or ac. Now I see romex in commercial areas. When am I allowed to put romex in commercial areas compared to mc or ac?

It depends on how the building is classifed.

Quote:
334.10 Uses Permitted. Type NM, Type NMC, and Type
NMS cables shall be permitted to be used in the following,
except as prohibited in 334.12:
(1) One- and two-family dwellings and their attached or
detached garages, and their storage buildings.
(2) Multi-family dwellings permitted to be of Types III, IV,
and V construction.
(3) Other structures permitted to be of Types III, IV, and V
construction
. Cables shall be concealed within walls,
floors, or ceilings that provide a thermal barrier of material
that has at least a 15-minute finish rating as identified
in listings of fire-rated assemblies.
Informational Note No. 1: Types of building construction
and occupancy classifications are defined in NFPA 220-
2012, Standard on Types of Building Construction, or the
applicable building code, or both.
Informational Note No. 2: See Informative Annex E for
determination of building types [NFPA 220, Table 3-1].
(4) Cable trays in structures permitted to be Types III, IV,
or V where the cables are identified for the use.
Informational Note: See 310.15(A)(3) for temperature
limitation of conductors.
(5) Types I and II construction where installed within
raceways permitted to be installed in Types I and II
construction.
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Old 02-27-2016, 11:41 AM   #6
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Re: Commercial Areas And Mc


Quote:
Originally Posted by ME2002 View Post
When I first started wiring commercial areas were always required to be mc or ac. Now I see romex in commercial areas. When am I allowed to put romex in commercial areas compared to mc or ac?
The old "no romex in a commercial setting" is a long standing myth in our trade.
Agree, 334.10.
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Old 02-27-2016, 12:27 PM   #7
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Re: Commercial Areas And Mc


Quote:
Originally Posted by ScipioAfricanus View Post
What does that mean?

I would think that all buildings are combustible to one degree or another.

Andy.
It's a classification in the NBC, NC buildings have to use materials that meet the necessary CSA or ULC listing.
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Old 02-28-2016, 08:12 AM   #8
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Re: Commercial Areas And Mc


This building is entirely made of wood with a poured concrete foundation. It is going to have drywall. I don't think this would ever meet any classification for being noncombustable.
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Old 02-28-2016, 09:22 AM   #9
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Re: Commercial Areas And Mc


Here is another good thread on this: http://www.electriciantalk.com/f2/bu...ii-iv-v-11154/

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