ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
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
#167507 08/14/07 04:00 PM
Joined: Oct 2004
Posts: 53
Comments were made last year (August 4, 2006) regarding putting USE cable in conduit & inside use of same. I have that situation, so I'm asking for your input.

The discussion was using USE in conduit for a pool situation. My situation is just a residence with a center pole/meter, so NEC 680 isn't applicable.

Here's the 2002 and 2005 NEC 338 sections of interest:

2002 NEC

338.10 Uses Permitted.
(B) Branch Circuits or Feeders.......
(4) Installation Methods for Branch Circuits and Feeders.......
(b) Exterior Installations..........
Type USE shall be permitted to be terminated in enclosures at an indoor location where Type USE cable emerges from the ground. The length of the cable extending indoors to the first termination box[not defined] shall not exceed 1.8 m (6 ft). Where Type USE cable emerges from the ground at terminations, it shall be protected in accordance with 300.5(D)...

2005 NEC:
(b) Exterior Installations........
Type USE cable installed as underground feeder and branch circuit cable shall comply with Part II of Article 340 [UF cable requirements]. Where Type USE cable emerges from the ground at terminations, it shall be protected in accordance with 300.5(D)....

It appears that the 6 foot restriction inside a structure to connect a USE feeder to a "termination box" has been eliminated, although it is unclear to me if the NEC folks meant to prohibit use inside under any circumstances. It just says that the cable has to be protected & installed in accordance with Section 340.

As far as putting USE in conduit, here's page 40 of the UL listing for USE...

Page 40 UL Wire and Cable Marking Guide
Types USE and USE-2 — Indicates cable for underground installation including direct burial in the earth.

It says "including", not "limited to" direct burial in the earth. I think the use of the word "including" was deliberate and not meant to be the sole use.

Although there isn't a table for USE in conduit, measurement in my instance shows it just meets the percentage fill requirements by a small amount.

All the conductors are insulated and installed in Schedule 40 conduit buried 6' below finish grade.

I think at worst case, I would have to put a "termination box" at the rim joist of the house to make the transition from USE to inside rated wire for the short run to the breaker panel.

Again, I don't see that the 2005 NEC prohibits short inside runs of USE to the "termination box", it has simply removed the 6 foot specification.

I wish the NEC folks would simply prohibit something if that's what they want. You almost need a Philadelphia lawyer to try and figure out some of these sections. Perhaps the 2008 NEC will simply prohibit USE inside under any circumstances.

Thanks guys!

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
When you read the commentary in the 2005 ROP (7-191 and the next couple) it is clear the intent of removing the 6 foot language is intending to eliminate any USE in the house.

Greg Fretwell
Joined: Mar 2007
Posts: 25
get an nec handbook and read the green shaded section under article 338.1

Joined: Oct 2004
Posts: 53
Southwire has multiple rated service cable to eliminate the's the address:

I'm sure there are others...

Again, thanks!

Joined: Nov 2002
Posts: 174
What is the problem with using USE indoors?

Joined: Jul 2004
Posts: 9,745
Likes: 13
It burns

Greg Fretwell

Link Copied to Clipboard

Tools for Electricians
Tools for Electricians

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
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