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Conduit required in a garage. ejluhn720 via HomeKB.com 05-05-2008
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Posted by Wayne Whitney on May 6, 2008, 10:13 am

> Is conduit required for wiring in a detached garage, or can the wire be run
> to the outlet boxes in NM cable? I have exposed 2x4's with no drywall. Can
> someone site a code reference? I am planning to add some additional wiring
> to my garage and would like to do it correctly. I had seen something in an
> old post about protecting wiring below 75".
>
> Anybody help me out?

Take a look at <http://forums.mikeholt.com/showthread.php?t=99016>.
I agree with those who say that since a detached garage is not a
dwelling unit, the use of NM cable is subject to the requirements of
NEC 334.10(3). That means NM can only be used if covered by a 15
minute fire-rated finish, i.e. drywall. You could use MC instead.

Cheers, Wayne

Posted by ejluhn720 via HomeKB.com on May 6, 2008, 1:33 pm
Wayne, Others,
Thanks for the help. It looks as if all types of NM cable (NM, NMC, NMS)
are out as per the "dwelling" issue of a detached garage as per 334.10 . Then
conduit or metallic cable it is!

Ed

Wayne Whitney wrote:
>> Is conduit required for wiring in a detached garage, or can the wire be run
>> to the outlet boxes in NM cable? I have exposed 2x4's with no drywall. Can
>[quoted text clipped - 3 lines]
>>
>> Anybody help me out?
>
>Take a look at <http://forums.mikeholt.com/showthread.php?t=99016>.
>I agree with those who say that since a detached garage is not a
>dwelling unit, the use of NM cable is subject to the requirements of
>NEC 334.10(3). That means NM can only be used if covered by a 15
>minute fire-rated finish, i.e. drywall. You could use MC instead.
>
>Cheers, Wayne

--
Message posted via HomeKB.com
http://www.homekb.com/Uwe/Forums.aspx/repair/200805/1


Posted by bud-- on May 6, 2008, 2:19 pm
ejluhn720 via HomeKB.com wrote:
> Wayne, Others,
> Thanks for the help. It looks as if all types of NM cable (NM, NMC, NMS)
> are out as per the "dwelling" issue of a detached garage as per 334.10 . Then
> conduit or metallic cable it is!
>

Interesting what one learns on newsgroups.

You could also ask the inspector if they allow NM.

>
> Wayne Whitney wrote:
>>> Is conduit required for wiring in a detached garage, or can the wire be run
>>> to the outlet boxes in NM cable? I have exposed 2x4's with no drywall. Can
>> [quoted text clipped - 3 lines]
>>> Anybody help me out?
>> Take a look at <http://forums.mikeholt.com/showthread.php?t=99016>.
>> I agree with those who say that since a detached garage is not a
>> dwelling unit, the use of NM cable is subject to the requirements of
>> NEC 334.10(3). That means NM can only be used if covered by a 15
>> minute fire-rated finish, i.e. drywall. You could use MC instead.
>>
>> Cheers, Wayne
>

Posted by on May 6, 2008, 10:49 pm
wrote:

>ejluhn720 via HomeKB.com wrote:
>> Wayne, Others,
>> Thanks for the help. It looks as if all types of NM cable (NM, NMC, NMS)
>> are out as per the "dwelling" issue of a detached garage as per 334.10 . Then
>> conduit or metallic cable it is!
>>
>
>Interesting what one learns on newsgroups.
>
>You could also ask the inspector if they allow NM.

That is the right answer. "subject to physical damage" is always a
judgement call and different AHJs see it differently. Some are happy
with Romex on running boards and others want greater degrees of
protection.
The question of whether you can use exposed Romex in a residential
garage is also a local call.

Posted by Wayne Whitney on May 6, 2008, 3:08 pm

> Thanks for the help. It looks as if all types of NM cable (NM, NMC, NMS)
> are out as per the "dwelling" issue of a detached garage as per 334.10 . Then
> conduit or metallic cable it is!

Depending on how much wiring you need to do, you mind find it easier
to cover the NM with drywall--I don't think you'd need to drywall the
whole garage. On the other hand, I believe MC cable is easy to use,
but haven't tried it myself.

Cheers, Wayne


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