Direct Burial/conduit Question Entering Building - Electrical - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 05-30-2009, 07:56 PM   #1
Member
 
Join Date: Apr 2008
Location: Western Masschusetts
Posts: 575
Rewards Points: 500
Default

direct burial/conduit question entering building


hi all,
well, finished rewiring the entire garage; all i have to do now is connect the two panels with my #6 underground wire.

two questions:

1) better to enter through the concrete knee wall, and make two 90 turns to get into the stud cavity, run the wire up to the panel,
or
hit the exterior knee wall underground, go up and 90 through the clapboard in the stud cavity?

(my t hinking is the latter idea would be simpler, but might look like crap from the outside. i've already purchased the PVC housing unit for entering the building.)

for t his, the guy at the hardware store was trying to tell me i need an expansion joint in the pvc going into the ground.

i wonder: the only reason i'd be using conduit would be to protect the exposed foot or so of wire coming out of the ground before it enters the building. why then, would i need to go down more than a few inches belpw grade with conduit and expansion joint (expensive)?

can't i just stick a piece of pipe a few inches below grade and be done?

i forget what the second question is, but i think it's up there somwhere....

thanks~!

Advertisement

wombosi is offline   Reply With Quote
Old 05-30-2009, 10:55 PM   #2
Electrical Contractor
 
kbsparky's Avatar
 
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Rewards Points: 2,000
Default

direct burial/conduit question entering building


Expansion joints are mainly used on complete conduit systems to counter thermal expansion and earth movement concerns

A simple protection sleeve usually would not require such an accessory, IMO

Advertisement

kbsparky is offline   Reply With Quote
Old 05-31-2009, 01:45 AM   #3
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Rewards Points: 2,000
Default

direct burial/conduit question entering building


you need to protect the wire to the full depth of the burial which should be 24 inches. I cannot remember if it is required or not but placing a red marker tape 1 foot above that in the trench is a really good idea as well.
nap is offline   Reply With Quote
Old 05-31-2009, 10:58 AM   #4
Member
 
Join Date: Jun 2007
Posts: 3,510
Rewards Points: 2,008
Default

direct burial/conduit question entering building


Use one of these to enter the wall outside at the height of your choice.

Last edited by J. V.; 10-09-2009 at 02:19 PM.
J. V. is offline   Reply With Quote
Old 05-31-2009, 11:55 AM   #5
Member
 
Join Date: Apr 2008
Location: Western Masschusetts
Posts: 575
Rewards Points: 500
Default

direct burial/conduit question entering building


Quote:
Originally Posted by J. V. View Post
Use one of these to enter the wall outside at the height of your choice.
yes, thanks, that's exactly what i just did.
just a little bummed about the exposed PVC on my nice garage.
tried to see about getting the metal version, but it wouldn't connect to PVC, and apparently you can't b ury EMT. ah, well, can always redo it down the road somehow if it really bothers me.

thanks mate.
wombosi is offline   Reply With Quote
Old 05-31-2009, 08:39 PM   #6
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Rewards Points: 2,000
Default

direct burial/conduit question entering building


Quote:
Originally Posted by schmolze View Post
and apparently you can't b ury EMT.

e.
who said that?

It can. I do not like to but it can.

What I would suggest is using RMC or IMC
nap is offline   Reply With Quote
Old 06-01-2009, 12:16 PM   #7
Member
 
Join Date: Jun 2007
Posts: 3,510
Rewards Points: 2,008
Default

direct burial/conduit question entering building


Your right nap. I thought it was not allowed to be buried. I have seen it installed in concrete, but never direct burial. See the article below.

358.10 Uses Permitted.
(A) Exposed and Concealed. The use of EMT shall be
permitted for both exposed and concealed work.
(B) Corrosion Protection. Ferrous or nonferrous EMT, elbows,
couplings, and fittings shall be permitted to be installed
in concrete, in direct contact with the earth, or in areas subject
to severe corrosive influences where protected by corrosion
protection and judged suitable for the condition.
J. V. is offline   Reply With Quote
Old 06-01-2009, 12:23 PM   #8
Member
 
Join Date: Jun 2007
Posts: 3,510
Rewards Points: 2,008
Default

direct burial/conduit question entering building


Quote:
Originally Posted by schmolze View Post
yes, thanks, that's exactly what i just did.
just a little bummed about the exposed PVC on my nice garage.
tried to see about getting the metal version, but it wouldn't connect to PVC, and apparently you can't b ury EMT. ah, well, can always redo it down the road somehow if it really bothers me.

thanks mate.
Very particular person right? One LB and one stub perfectly strait (level horizontally and vertically) and flat against the wall is about as good as you can get. Does your power meter appearance make you lose sleep?

If it bugs you that much, rent a backhoe and dig under the footer and penetrate up inside.

You can adapt PVC to any metal conduit or condulet (LB) with the correct fittings.
You can use one of these to transition from PVC to a metal LB.

Last edited by J. V.; 10-09-2009 at 02:19 PM.
J. V. is offline   Reply With Quote
Old 06-02-2009, 12:33 AM   #9
DIY'r
 
ScottR's Avatar
 
Join Date: Oct 2008
Location: Hicksville, NY (Yes, it's an actual town).
Posts: 520
Rewards Points: 500
Default

direct burial/conduit question entering building


Quote:
Originally Posted by schmolze View Post
tried to see about getting the metal version, but it wouldn't connect to PVC, and apparently you can't b ury EMT.
IMO PVC is the way to go for looks. You can see plenty of EMT and/or fittings on the outside of buildings that perhaps weren't galvanized in the best way -- rust city. And yours will be at/in the ground.

Advertisement

ScottR is offline   Reply With Quote
Reply


Thread Tools
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
NEC uses building size?????? hhiibel Electrical 14 08-08-2008 01:19 PM
Deck Building Question - Installing Ledger Board to Rim Joists Ler0y Jenkins General DIY Discussions 20 05-18-2008 12:05 PM
yes, another sub-panel question!!! tomia Electrical 6 12-18-2007 06:18 PM
Question on garage addition; not on building but design/layout 52Caddy General DIY Discussions 3 11-22-2007 09:09 AM
foundation question for building a small cabin TNeat Building & Construction 3 08-01-2007 07:08 PM




Top of Page | View New Posts