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Old 12-23-2009, 02:06 PM   #1
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Default NM-B and UF Cable in PVC conduit

Can anyone provide code references (other than 334.15B) about the installation of NM-B and UF cables in PVC conduits??

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Old 12-23-2009, 02:28 PM   #2
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Off the top of my head without looking it up:

NM-B cable is not permitted in any wet location including aboveground and underground raceways.

UF-B cable is permitted in any outdoor raceways, minding conduit fill of course. In fact, you can bury non-electrical tubing like plumbing PVC and then run UF cable in it, as the tubing is only a sleeve, not a raceway.

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Old 12-23-2009, 02:55 PM   #3
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What are you looking for. It is allowed but if it is a complete raceway then cable fill must be considered.
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Old 12-23-2009, 04:47 PM   #4
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Default NM-B and UF in conduit

Sometimes it's desireable to run NM-B or UF in conduit for protection.

UF is OK underground, but I feel better is it's in conduit to help deflect shovels, etc. A run of UF outside to an A.C compressor is better protected if it's in flex conduit. Running NM-B up garage walls and into attics protects the NM-B, but that's covered by 334.15B. for NM-B, I guess the real questions is it OK to run NM-B or UF in a properly sized conduit (considering derating for CCCs) between junction boxes, in a dry environment for cosmetic reasons?
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Old 12-23-2009, 04:54 PM   #5
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Quote:
Originally Posted by czars View Post
I guess the real questions is it OK to run NM-B or UF in a properly sized conduit (considering derating for CCCs) between junction boxes, in a dry environment for cosmetic reasons?
Yes.

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Old 12-23-2009, 05:07 PM   #6
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I think we should wait for the resident expert on UF and PVC............
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Old 12-23-2009, 05:27 PM   #7
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I think we should wait for the resident expert on UF and PVC............
Your right, my bad.

I will take my Scotchkote and leave.

Chris
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Old 01-15-2010, 08:42 PM   #8
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Article 334 NM Cable

334.15 Exposed Work. In exposed work, except as provided
in 300.11(A), cable shall be installed as specified in
334.15(A) through (C).
(A) To Follow Surface. Cable shall closely follow the surface
of the building finish or of running boards.
(B) Protection from Physical Damage. Cable shall be
protected from physical damage where necessary by rigid·
metal conduit, intermediate metal conduit, electrical metallic
tubing, Schedule 80 PVC conduit, or other approved
means. Where passing through a floor, the cable shall be
enclosed in rigid metal conduit, intermediate metal conduit,
electrical metallic tubing, Schedule 80 PVC conduit, or
other approved means extending at least 150 mm (6 in.)
above the floor

Article 340 UF Cable
340.10
Uses Permitted. Type UF cable shall be permitted
as follows:

(1)
For use underground, including direct burial in the
earth. For underground requirements, see 300.5.
(2) As single-conductor cables. Where installed as singleconductor
cables, all conductors of the feeder grounded
conductor or branch circuit, including the grounded
conductor and equipment grounding conductor, if any,
shall be installed in accordance with 300.3.
(3) For wiring in wet, dry, or corrosive locations under the
recognized wiring methods of this
Code.

(4) Installed as nonmetallic-sheathed cable. Where so installed,
the installation and conductor requirements
shall comply with Parts II and III of Article 334 and
shall be of the multiconductor type.
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Old 01-19-2010, 11:28 AM   #9
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Quote:
Originally Posted by codeone View Post
Article 334 NM Cable


334.15 Exposed Work. In exposed work, except as provided
in 300.11(A), cable shall be installed as specified in
334.15(A) through (C).
(A) To Follow Surface. Cable shall closely follow the surface
of the building finish or of running boards.
(B) Protection from Physical Damage. Cable shall be
protected from physical damage where necessary by rigid·
metal conduit, intermediate metal conduit, electrical metallic
tubing, Schedule 80 PVC conduit, or other approved
means. Where passing through a floor, the cable shall be
enclosed in rigid metal conduit, intermediate metal conduit,
electrical metallic tubing, Schedule 80 PVC conduit, or
other approved means extending at least 150 mm (6 in.)
above the floor

Article 340 UF Cable

340.10
Uses Permitted. Type UF cable shall be permitted
as follows:
(1)


For use underground, including direct burial in the
earth. For underground requirements, see 300.5.
(2) As single-conductor cables. Where installed as singleconductor
cables, all conductors of the feeder grounded
conductor or branch circuit, including the grounded
conductor and equipment grounding conductor, if any,
shall be installed in accordance with 300.3.
(3) For wiring in wet, dry, or corrosive locations under the
recognized wiring methods of this

Code.
(4) Installed as nonmetallic-sheathed cable. Where so installed,
the installation and conductor requirements
shall comply with Parts II and III of Article 334 and

shall be of the multiconductor type.


Are you saying that UF cable installed inside of a dwelling unit underground in a PVC conduit is not permitted?

Chris

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Old 01-19-2010, 11:43 AM   #10
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Quote:
Originally Posted by raider1 View Post
Are you saying that UF cable installed inside of a dwelling unit underground in a PVC conduit is not permitted?

Chris

[/left]
No thats not what im saying. NM cable is not allowed!
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Old 01-19-2010, 11:56 AM   #11
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300.5 Underground! Installations.
(C) Underground Cables Under Buildings.
Underground

cable installed under a building shall be in a raceway.
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Old 01-19-2010, 12:33 PM   #12
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Quote:
Originally Posted by codeone View Post
No thats not what im saying. NM cable is not allowed!
Agreed, that was established early on in this thread.

Chris
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Old 01-29-2010, 06:59 AM   #13
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How would you size a sleeve for Multiconductor Type USE cable, besides what the a POCO requires?
If will fit...put the cable in it?
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Old 01-29-2010, 09:33 AM   #14
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Quote:
Originally Posted by John View Post
How would you size a sleeve for Multiconductor Type USE cable, besides what the a POCO requires?
If will fit...put the cable in it?
Note 5, Chapter 9.
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Old 01-29-2010, 10:47 AM   #15
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POCO mandated rules, see table.


Attachment 2587

Last edited by John; 08-10-2010 at 07:23 AM.
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Old 01-29-2010, 10:55 AM   #16
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Quote:
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POCO mandated rules, see table.
But only for 'Vermont Utilities" customers.
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Old 01-29-2010, 05:41 PM   #17
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Good luck on pulling UF though conduit. Very stiff to work with.
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Old 10-12-2012, 01:32 PM   #18
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Default UF as an aerial

I have a temporary situation where I will be using UF for the undergound but I need to go from underground to overhead over a drive way and then back undergound and didnt want to break the wire? Any suggestions? can i use UF and use a messenger wire and strap it to that?
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Old 10-12-2012, 03:51 PM   #19
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Quote:
Originally Posted by sokoservices View Post
I have a temporary situation where I will be using UF for the undergound but I need to go from underground to overhead over a drive way and then back undergound and didnt want to break the wire? Any suggestions? can i use UF and use a messenger wire and strap it to that?

Yes, 340.10(3) and 396.10 plus T. 396.10(A)

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