Connecting conduit to subpanel

12-05-2008, 06:00 PM	#1
xv144 Newbie   Join Date: Nov 2008 Location: PA Posts: 28	Connecting conduit to subpanel I am installing a 125AMP subpanel in my garage (details at http://www.diychatroom.com/showthrea...361#post190361). I will be backfeeding a 60AMP breaker. What is the proper way to connect the 1" PVC conduit to the box?

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12-05-2008, 06:07 PM	#2
jerryh3 Member   Join Date: Dec 2007 Location: Baltimore, MD Posts: 1,802	Connecting conduit to subpanel A male thread with a locknut and bushing.

12-05-2008, 07:21 PM	#3
xv144 Newbie   Join Date: Nov 2008 Location: PA Posts: 28	Connecting conduit to subpanel Quote: Originally Posted by jerryh3 A male thread with a locknut and bushing. Nothing needed to clamp the wire? Of course I really don't see how it could move (85' of 6AWG THHN in conduit). I know running 12/14 gauge wire in my main box I always secure the wires in the holes where they enter.

12-05-2008, 07:24 PM	#4
jamiedolan DIY'er     Join Date: Sep 2008 Location: Neenah, Wisconsin, USA Posts: 2,030 Blog Entries: 2	Connecting conduit to subpanel Quote: Originally Posted by xv144 Nothing needed to clamp the wire? Of course I really don't see how it could move (85' of 6AWG THHN in conduit). I know running 12/14 gauge wire in my main box I always secure the wires in the holes where they enter. THHN in conduit does not have anything like a clamp to secure it. It comes loose out of the conduit into a approved junction box or switch panel box. Use the locknut and bushing. jamie

12-06-2008, 12:42 PM	#5
J. V. Member     Join Date: Jun 2007 Location: South Carolina Posts: 3,313	Connecting conduit to subpanel Use a 1" connector and a 1" locknut. The bushing is optional.

12-06-2008, 05:53 PM	#6
jerryh3 Member   Join Date: Dec 2007 Location: Baltimore, MD Posts: 1,802	Connecting conduit to subpanel Optional? Attached Images

12-06-2008, 07:34 PM	#7
rgsgww Member   Join Date: Jul 2008 Location: Iowa Posts: 1,543	Connecting conduit to subpanel Its required.

12-06-2008, 08:40 PM	#8
chris75 Electrician   Join Date: Aug 2007 Location: Connecticut, Litchfield Posts: 2,015	Connecting conduit to subpanel Quote: Originally Posted by rgsgww Its required. code reference? I agree if the wire size is #4 or larger... but thats it. Last edited by chris75; 12-06-2008 at 08:43 PM.

12-06-2008, 08:49 PM	#9
rgsgww Member   Join Date: Jul 2008 Location: Iowa Posts: 1,543	Connecting conduit to subpanel Quote: Originally Posted by chris75 code reference? I agree if the wire size is #4 or larger... but thats it. Oh, never mind. All you have to do is ream the conduit, right? Yeah, I can see where its a good thing with large wires.

12-07-2008, 12:27 AM	#10
jbfan Electrical Contractor   Join Date: Jun 2004 Location: Newnan GA Posts: 5,010	Connecting conduit to subpanel Don't forget a breaker hold down for the backfed 60 amp breaker! __________________ Yes I am a Pirate, 200 years too late. "Jimmy Buffett"

12-07-2008, 08:30 AM	#11
xv144 Newbie   Join Date: Nov 2008 Location: PA Posts: 28	Connecting conduit to subpanel Quote: Originally Posted by jbfan Don't forget a breaker hold down for the backfed 60 amp breaker! The alleged electrician at HD never heard of these, and I cannot find one on the Internet. Do they go by another name?

12-07-2008, 08:38 AM	#12
xv144 Newbie   Join Date: Nov 2008 Location: PA Posts: 28	Connecting conduit to subpanel Thanks guys. I connected it yesterday. Cost $2 for the 2 extra PVC parts.

12-07-2008, 08:54 AM	#13
jerryh3 Member   Join Date: Dec 2007 Location: Baltimore, MD Posts: 1,802	Connecting conduit to subpanel Quote: Originally Posted by xv144 The alleged electrician at HD never heard of these, and I cannot find one on the Internet. Do they go by another name? Square D' official name is "Back-Fed Main Hold-Down Bracket." Which panel did you end up using?

12-07-2008, 09:18 AM	#14
xv144 Newbie   Join Date: Nov 2008 Location: PA Posts: 28	Connecting conduit to subpanel Quote: Originally Posted by jerryh3 ...Which panel did you end up using? Square D QO QO124L125G LOAD CENTER - $55 on Ebay for brand new with cover and ground bar.

12-07-2008, 10:05 AM	#15
jerryh3 Member   Join Date: Dec 2007 Location: Baltimore, MD Posts: 1,802	Connecting conduit to subpanel Quote: Originally Posted by xv144 Square D QO QO124L125G LOAD CENTER - $55 on Ebay for brand new with cover and ground bar. I'm pretty sure it's this one: the PK4MB2LA http://ecatalog.squared.com/pubs/Electrical%20Distribution/Load%20Centers/Accessories,%20Homeline%20(HOM,%20LK,%20PK,%20QOM)/1100HO9902.pdf There should be a sticker inside the box with the approved parts listed.