ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
AFCI’s Revisited
by sparky - 09/24/22 09:58 AM
NFPA Price Increase Coming
by Bill Addiss - 09/23/22 02:22 PM
Siemens breakers
by gfretwell - 09/23/22 01:45 PM
What do you look like?II
by HotLine1 - 09/22/22 12:33 PM
Tough being a lineman's kid
by gfretwell - 09/21/22 03:05 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 8 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jun 2012
Posts: 75
Member
Hello- I have a question about installing mc cable under a patio or porch that is 12 x 12 open wall.

I say damp location.

Are stamped octagon boxes and screw type connectors allowed?

Thank you


Don't drive and TEXT! Drive now TALK LATER!
Stay up to Code with the Latest NEC:


2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:
 

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep
 

Joined: Jul 2004
Posts: 9,745
Likes: 13
G
Member
If it is a rain tight deck, (no water feeds through the cracks) it may be damp but I would still use bell boxes. Those galvanized octagon boxes will still rust up pretty bad in a damp location. I am not sure how they are listed because few people even try it here.


Greg Fretwell
Joined: Apr 2002
Posts: 7,313
Likes: 7
Member
Although the Code allows MC, I will go along with where Greg is going regarding the patio/deck being rain tight.

Are you talking alum jacket MC, or steel jacket? Personally I would have an issue with alum jacket being 'outside'. Note I say 'personally'. Or are you talking PVC jacketed MC which would be no issues, with the listed connectors, and a suitable box for the enviornment.

Maybe PVC conduit and PVC device boxes would be a better choice?



John
Joined: Jul 2004
Posts: 9,745
Likes: 13
G
Member
There was a while when aluminum MC cable was sold as wet location. I am not sure why it was OK and then why it wasn't.

[Linked Image from gfretwell.com]


Greg Fretwell
Joined: Jul 2004
Posts: 9,745
Likes: 13
G
Member
I like RNC but it does have that sagging problem in the summer unless you strap it every 2 feet or so and you also need to deal with expansion issues.


Greg Fretwell
Joined: Apr 2002
Posts: 7,313
Likes: 7
Member
Greg:

I take that label as the rating/listing for the conductors, not the jacket, unless I'm missing something here.

I have seen the al jacket corroding in a few unfinished (older) basements that had no cliamate control.


John

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: 812
Joined: April 2004
Top Posters(30 Days)
Jim M 5
Trumpy 4
Popular Topics(Views)
297,348 Are you busy
228,231 Re: Forum
213,133 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5