NM-B in basement


  #1  
Old 04-18-24, 11:48 AM
W
Member
Thread Starter
Join Date: Dec 2005
Location: USA
Posts: 3,040
Received 24 Upvotes on 20 Posts
NM-B in basement

I am installing a new circuit for a workbench in my unfinished basement. The stud walls are covered with 1" foam insulation. Since the wiring will be exposed I am planning on using some BX that I have. My question is - could I have run exposed NM along the surface of the insulation?

After I started running the BX I noticed that there is quite a bit of exposed NM already. Most of it stapled to the face of 2X4s feeding wall switches, a well switch, hot water heater etc. and Could I have used NM since it isn't a living space?
 
  #2  
Old 04-18-24, 12:50 PM
L
Member
Join Date: Sep 2019
Posts: 136
Upvotes: 0
Received 38 Upvotes on 32 Posts
The NEC makes no distinction between NM and AC/MC as far as sturdiness goes...both are considered fragile.

 
  #3  
Old 04-18-24, 02:06 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,401
Received 4,046 Upvotes on 3,630 Posts
Metal clad is not considered fragile.
When you use NM cable.... the code says it must be protected from damage.
Running it on the service in an active shop is not considered protected.

You can sleeve it in conduit for protection.
 
Wayne Mitchell voted this post useful.
  #4  
Old 04-18-24, 03:17 PM
W
Member
Thread Starter
Join Date: Dec 2005
Location: USA
Posts: 3,040
Received 24 Upvotes on 20 Posts
I have the BX left over from another project so I'm going to use that. All of the exposed NM was installed by an electrician just 3 years ago.

If I go with NM I would have to buy some. If I buy some I might have to take out a loan and then wait for an hour for a big box guy to come and unlock the wire cage.
 
  #5  
Old 04-18-24, 06:23 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 13,985
Received 199 Upvotes on 174 Posts
Both NM and AC cable need to be protected against physical damage. The definition of physical damage is subjective.
 
AFJES voted this post useful.
  #6  
Old 04-19-24, 08:59 AM
A
Member
Join Date: Mar 2010
Location: USA
Posts: 4,556
Upvotes: 0
Received 285 Upvotes on 260 Posts
(Older) BX or similar spiral metal clad cable, without a bare wire or metal strip running the full length inside, outside any paper lining and without a ground wire inside, is not colde compliant

 
  #7  
Old 04-19-24, 12:05 PM
W
Member
Thread Starter
Join Date: Dec 2005
Location: USA
Posts: 3,040
Received 24 Upvotes on 20 Posts
The BX I have is code compliant.
 
  #8  
Old 04-19-24, 05:05 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: United States
Posts: 14,385
Received 892 Upvotes on 753 Posts
BX has not been sold for many, many years. I suspect you have AC or MC cable.
 
AFJES voted this post useful.
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: