Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-06-2009, 01:48 PM   #1
Member
 
Join Date: Apr 2007
Posts: 2,231
Share |
Question

driving wire through buried conduit


my detached shed will have a 50A subpanel and connected to the main panel by gauge 6 wire. i have already run the indoor portion, which is cable 6/3 and waiting to do some more digging outside so that i bury the conduit.

originally, i was planning to use 6/3 UF wire for the outside without conduit but, since i will also be burying water supply and sewer, decided to go with a conduit and regular wire. however, what i am trying to decide is whether to go with 6/3 NM cable or individual wires. someone recommended individual cause of the heat issue with the outer coat of insulation within a conduit as well as the same coat giving resistance while driving through. what do you guys recommend ?

as a bonus question, as someone who has never really driven wire through conduit, what should be my limits in terms of distance or number of 90 deg elbows that i should realistically expect myself to be able to drive ? e.g. looking from afar, i wouldn't dare take a stab at more than 2-3 max elbows over a 10-15 ft distance at a time cause of jamming. wondering what the pros think ?

amakarevic is offline   Reply With Quote
Old 07-06-2009, 02:07 PM   #2
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

driving wire through buried conduit


NM cable can't go in a conduit - not wet rated
UF is rated for burial, conduit must be big enough to hold the wire
Wire must be THWN rated - wet location

Max elbows without a pull box is 360 degrees
I had (4) 90 degree elbows at a distance of 70'+ w/ (3) #6's & a #8 green ground
I used yellow lube & a snake - easy going
I also oversized my conduit to 1.5" size
#6 is rated for 55a & you can feed with a 60a breaker
I used a small 100a panel w/main breaker in my pool cabana

10-15' should be easy even with 3 elbows
Difficulty will depend on conduit (bigger is better), number of elbows & distance
2 people makes it much easier - I was solo
1 person feeds the wire as the other person pulls on the snake

Some people use all sorts of stuff for lube
I bought the electric lube from HD - $7 I think
Some liquid dish soaps have animal fat in them & smell after a while

Scuba_Dave is offline   Reply With Quote
Old 07-06-2009, 02:11 PM   #3
Member
 
Join Date: Apr 2007
Posts: 2,231
Question

driving wire through buried conduit


why does it have to be wet rated if it goes in a conduit ???

i plan to use 1" conduit, will that be sufficient for the type of wire that i need. the guy at HD told me that, if i used 6/3 UF cable (flat and real wide), i don't need conduit.

so, which wire/cable combination should i use ???
amakarevic is offline   Reply With Quote
Old 07-06-2009, 02:21 PM   #4
Journeyman Wireman
 
Join Date: Jun 2009
Location: Missouri
Posts: 90
Default

driving wire through buried conduit


Individual wires are easier to pull. How far do you have to go? Use a fish tape to pull in a 1/4" rope if its really hard. It's going to be in conduit so it's a dry location. (Water usually seaps in though)
jbberns is offline   Reply With Quote
Old 07-06-2009, 02:25 PM   #5
Member
 
Join Date: Apr 2007
Posts: 2,231
Question

driving wire through buried conduit


Quote:
Originally Posted by jbberns View Post
It's going to be in conduit so it's a dry location.
so, are you saying it is OK to use NM wire ?
amakarevic is offline   Reply With Quote
Old 07-06-2009, 02:26 PM   #6
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

driving wire through buried conduit


Conduit buried underground by definition is considered a wet location

You can use UF & direct bury the wire at 24", protected where it goes in & comesout of the trench
Conduit you can bury at 18"
Bring a piece of 1" conduit to the wire & take a look at the cross section of the wire compared to the 1" conduit
I prefer conduit to better protect the wire
And if anything happens you can pull new wire instead of digging again
Scuba_Dave is offline   Reply With Quote
Old 07-06-2009, 02:27 PM   #7
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

driving wire through buried conduit


Quote:
Originally Posted by jbberns View Post
Individual wires are easier to pull. How far do you have to go? Use a fish tape to pull in a 1/4" rope if its really hard. It's going to be in conduit so it's a dry location. (Water usually seaps in though)
Quote:
Originally Posted by amakarevic View Post
so, are you saying it is OK to use NM wire ?
Absolutely NOT !!
Scuba_Dave is offline   Reply With Quote
Old 07-06-2009, 02:29 PM   #8
Member
 
Join Date: Apr 2007
Posts: 2,231
Default

driving wire through buried conduit


OK, which wire then ?
amakarevic is offline   Reply With Quote
Old 07-06-2009, 02:32 PM   #9
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

driving wire through buried conduit


Direct burial = UF
Conduit (if big enough) - you could use UF
But better to go with THWN rated individual wires
Scuba_Dave is offline   Reply With Quote
Old 07-06-2009, 02:33 PM   #10
Journeyman Wireman
 
Join Date: Jun 2009
Location: Missouri
Posts: 90
Default

driving wire through buried conduit


Quote:
Originally Posted by Scuba_Dave View Post
Conduit buried underground by definition is considered a wet location
In the NEC or by you? Just curious
jbberns is offline   Reply With Quote
Old 07-06-2009, 02:35 PM   #11
Member
 
Join Date: Apr 2007
Posts: 2,231
Question

driving wire through buried conduit


Quote:
Originally Posted by Scuba_Dave View Post
But better to go with THWN rated individual wires
will a 1" conduit support this ?
amakarevic is offline   Reply With Quote
Old 07-06-2009, 02:36 PM   #12
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Default

driving wire through buried conduit


Quote:
Originally Posted by jbberns View Post
In the NEC or by you? Just curious
You are a journeyman & you are asking me? Really ?
You think conduit underground is a dry location?
Scuba_Dave is offline   Reply With Quote
Old 07-06-2009, 02:42 PM   #13
Member
 
300zx's Avatar
 
Join Date: May 2009
Location: Florida
Posts: 630
Post

driving wire through buried conduit


Quote:
Originally Posted by amakarevic View Post
will a 1" conduit support this ?
Yes 1" conduit can have up to 7 -#6
300zx is offline   Reply With Quote
Old 07-06-2009, 03:03 PM   #14
My License Ain't 4 Sale..
 
Join Date: Feb 2008
Location: Atlanta, Ga/Hamilton, Al
Posts: 1,813
Default

driving wire through buried conduit


Quote:
Originally Posted by jbberns View Post
In the NEC or by you? Just curious

Article 100: Definitions. Location, Wet: Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather.

There are some of the sharpest electricians here, and some real good DIY'rs as well. This isn't like Mike Holt's forum where you would be ridiculed and beat down over it, but you got to stay on your toes, because you WILL be called out on it. I think it is fair to say that even the most experienced of us have learned something new at one time or another from this lowly DIY forum.
InPhase277 is offline   Reply With Quote
Old 07-06-2009, 03:04 PM   #15
General Contractor
 
MacRoadie's Avatar
 
Join Date: Apr 2008
Location: Orange County, CA
Posts: 76
Default

driving wire through buried conduit


Quote:
Originally Posted by jbberns View Post
In the NEC or by you? Just curious
Article 100.

Location:

Wet Location: Installations underground or in concrete slabs or masonry in direct contact with the earth, and locations subject to saturation with water or other liquids, such as vehicle washing areas, and locations exposed to weather and unprotected.

Article 310-8. Wet Locations.

(a) Insulated Conductors. Insulated conductors used in wet locations shall be (1) lead-covered; (2) Types RHW, TW, THW, THHW, THWN, XHHW; or (3) of a type listed for use in wet locations.

Conductors used for direct burial applications shall be of a type listed for such use.

MacRoadie is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wire, Conduit and Voltage Drop Questions kikdrum Electrical 9 03-01-2009 06:50 AM
Burial wire and a seeming difference of opinion... SxS Electrical 19 02-24-2009 09:16 AM
Conduit for #6 wire joey b Electrical 13 11-22-2008 12:13 PM
Installing Fluorescents in Garage rzrbkpk Electrical 26 04-08-2008 09:00 PM
pulling wire through old flexible conduit cbray Electrical 1 05-20-2005 03:55 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.