ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
220/230/240V 60Hz Systems
by Albert. 11/07/18 12:48 AM
Black & Decker Recalls Hammer Drills
by Admin. 11/01/18 07:22 PM
Having around 30 projectors to dump
by gfretwell. 10/31/18 10:54 PM
Installing a small swimming pool
by TimothyHallam. 10/30/18 10:42 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 12 guests, and 22 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Question about metal boxes #164621
06/07/07 11:17 AM
06/07/07 11:17 AM
E
EV607797  Offline OP
Member
Joined: Oct 2006
Posts: 745
Fredericksburg, VA, USA
Does anybody know what the letters "N" and "T" indicate on Romex clamps with metal boxes? The N is on one side and the T is on the other. I don't think it has anything to do with the manufacturer because I have seen this on several different brands. It's just one of those things that I have always wondered.


---Ed---

"But the guy at Home Depot said it would work."
Work Gear for Electricians and the Trades
Re: Question about metal boxes [Re: EV607797] #164636
06/07/07 06:28 PM
06/07/07 06:28 PM
G
GTE  Offline
Member
Joined: Mar 2003
Posts: 48
Bridgehampton, N.Y. USA
nob & tube

Re: Question about metal boxes [Re: GTE] #164639
06/07/07 07:31 PM
06/07/07 07:31 PM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
I'm not one who could bag on spelling... Isn't it Knob & Tube? Nob is a town in Isreal.

Otherwise, I have no idea.


Mark Heller
"Well - I oughta....." -Jackie Gleason
Re: Question about metal boxes [Re: e57] #164662
06/08/07 10:35 AM
06/08/07 10:35 AM
A
Alan Nadon  Offline
Member
Joined: Mar 2005
Posts: 399
Elkhart, IN. USA
The mark is to show what the clamp is listed for. I'm sure the N is for NM cable. Don't know about the T.
Stop at the supply house and look at their box catalogue it will have all the clamps listed. That is where I had to go last time to check on AC cable clamps.


Alan--
If it was easy, anyone could do it.
Re: Question about metal boxes [Re: Alan Nadon] #165288
06/25/07 06:27 AM
06/25/07 06:27 AM
electure  Offline

Member
Joined: Dec 2000
Posts: 4,275
Fullerton, CA USA
From the UL White Book:

"The clamps are marked with the following letters or combinations thereof to indicate that they are suitable for use with armored cable (‘‘A’’): flexible metal conduit – ‘‘F,’’ nonmetallic-sheathed cable – ‘‘N,’’ or flexible tubing (loom) – ‘‘T.’’ Clamps
suitable for Type MC metal-clad cable are marked ‘‘MCI’’ for metal-clad
interlocking armored cable, ‘‘MCI-A’’ for metal-clad interlocking armor
ground cable, ‘‘MCS’’ for metal-clad continuous smooth-sheath cable, and
‘‘MCC’’ for metal-clad continuous corrugated-sheath cable. If suitable for all
seven types, the clamp is marked ‘‘ALL.’’ Clamps suitable for nonmetallicsheathed
cable are also suitable for multiconductor underground feeder and
branch circuit cable where used in dry locations."

Re: Question about metal boxes [Re: electure] #165306
06/25/07 11:03 AM
06/25/07 11:03 AM
A
Alan Nadon  Offline
Member
Joined: Mar 2005
Posts: 399
Elkhart, IN. USA
Thank You.
Alan--


Alan--
If it was easy, anyone could do it.

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 8
dsk 3
Popular Topics(Views)
251,417 Are you busy
188,638 Re: Forum
178,342 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.029s Queries: 15 (0.006s) Memory: 0.9775 MB (Peak: 1.1259 MB) Zlib enabled. Server Time: 2018-11-14 01:32:33 UTC