ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#22181 - 02/20/03 04:01 AM ENT
tsolanto Offline
Member
Registered: 09/03/02
Posts: 131
Loc: Long Island NY
Is it leagal to use ENT undergroung if it is only used as a sleeve.

I know its against code to bury it, but does'nt only that apply if its a raceway system.

Lets say the underground wiring is XLP-USE direct burial. Using this cable we need no conduit.
Top
Work Gear for Electricians and the Trades
#22182 - 02/20/03 02:21 PM Re: ENT
WNYJim Offline
Member
Registered: 06/06/02
Posts: 39
Loc: Rochester, NY, USA
Why would you want to use EMT underground?
After a few years (maybe months depending on soil conditions) it will start to rust and there will be sharp edges around the cable just waiting to cut into it.
How about using some PVC instead?
Top
#22183 - 02/20/03 02:27 PM Re: ENT
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
ENT (Electrical Nonmetallic Tubing), not EMT
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts
Top
#22184 - 02/20/03 04:43 PM Re: ENT
Joe Tedesco Offline
Member
Registered: 10/07/00
Posts: 2749
Loc: Boston, Massachusetts USA
See 362.10 for "Uses Permitted" and see the following:

(6) Encased in poured concrete, or embedded in a concrete slab on grade where ENT is placed on sand or approved screenings, provided fittings identified for this purpose are used for connections.

(7) For wet locations indoors as permitted in this section or in a concrete slab on or below grade, with fittings listed for the purpose.


[This message has been edited by Joe Tedesco (edited 02-20-2003).]
_________________________
Joe Tedesco, NEC Consultant
Top
#22185 - 02/20/03 05:12 PM Re: ENT
Elzappr Offline
Member
Registered: 12/20/01
Posts: 270
Loc: Oregon
Its not being used as a raceway, its just another type of "fill dirt" eh? I suppose someone could use any sort of non-metallic pipe to act as a sleeve.

Trouble is, how would anyone who dug this up know that it was electrical? It might just look like some burried trash.

300.5 talks about backfill materials and also: "protection shall be provided in the form of..suitable running boards, suitable sleeves, or other approved means." This sounds like approval is needed by your AHJ. Though using plastic conduit would appear to be a suitable "sleeve", it might just pose a hazard for those who don't realize there is live wiring in it...but then again, any "running boards" would be just as misleading. The code doesn't stipulate warning ribbons above underground branch circuits -- just service conductors(300.5(D)(3)). If its residential, and not burried deeper than 12 inches (assuming ,120V and gfci protected), then warning ribbon wouldn't be located above the wiring shallow enough to suitably warn any inadvertant digging up of the wiring. So warning ribbon wouldn't do more than serve as a way to identify the burried "sleeve and wiring" as a potential hazard. I don't think I would be comfortable in calling that shot if I was the AHJ.
Top

Member Spotlight
Member Since: 11/17/00
Posts: 2232
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 61 Guests and 7 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 51
HotLine1 43
gfretwell 17
Trumpy 16
Ruben Rocha 13
 
Newest Members
clee512, Jdscott2005, FAIZAN, Regitest2, sureshazhagai

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals