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 08-27-2010, 09:55 AM   #1
Newbie
 
Join Date: Aug 2010
Location: Southern Illinois
Posts: 22
Share |
Default

Conduit


I'm going to use conduit to make a large fan cage and I need to know the difference between rigid and emt conduit...

I want the lightest weight ...
Have to make a 4' diameter ...
and weld it all together ... (what material are they made of?)

RDGreen is offline   Reply With Quote
Old 08-27-2010, 10:20 AM   #2
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,529
Default

Conduit


Rigid conduit is a thick pipe and is normally threaded.

EMT is a thin walled tubing. If you were to try and weld it you may burn through, but it might be worth a shot.

__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
Old 08-27-2010, 10:39 AM   #3
Newbie
 
Join Date: Aug 2010
Location: Southern Illinois
Posts: 22
Default

Conduit


Quote:
Originally Posted by Jim Port View Post
Rigid conduit is a thick pipe and is normally threaded.

EMT is a thin walled tubing. If you were to try and weld it you may burn through, but it might be worth a shot.
Is emt steel or allum?
RDGreen is offline   Reply With Quote
Old 08-27-2010, 11:32 AM   #4
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,529
Default

Conduit


EMT is typically steel.
__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
Old 08-27-2010, 11:34 AM   #5
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,749
Default

Conduit


Quote:
Originally Posted by RDGreen View Post
Is emt steel or allum?
Both will be galvanized, so take welding it.

Emt is lighter than ridigd, but use 4" it will be heavey anyway.
__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"

Last edited by jbfan; 08-27-2010 at 11:38 AM.
jbfan is online now   Reply With Quote
Old 08-27-2010, 10:05 PM   #6
Union Electrician
 
goose134's Avatar
 
Join Date: Nov 2007
Location: Chicago, USA
Posts: 615
Default

Conduit


I don't think I've ever seen anyone try to weld EMT or rigid for that matter. EMT will keep the weight down for sure. FYI there are manufacturers who make EMT in aluminum AND stainless.



You'd puke at the price, but it's out there.
goose134 is offline   Reply With Quote
Old 08-28-2010, 09:32 AM   #7
Member
 
Join Date: Jun 2007
Posts: 3,503
Default

Conduit


EMT can be braised with good success. I have a friend who makes deer stands and racks for ATV's out of EMT. I bent the pipe for him on the first couple projects and he has been doing it all by himself since. EMT is perfect for braising.
J. V. is offline   Reply With Quote
Old 08-28-2010, 09:43 AM   #8
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,529
Default

Conduit


Quote:
Originally Posted by J. V. View Post
EMT can be braised with good success.. EMT is perfect for braising.
You might be able to braze EMT sucessfully, but I doubt that it will ever end up tender if you braise it.

braise (brz)
tr.v. braised, brais·ing, brais·es To cook (meat or vegetables) by browning in fat, then simmering in a small quantity of liquid in a covered container.

Sorry John, just couldn't resist.
__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
Old 08-29-2010, 08:05 AM   #9
I=E/R
 
a7ecorsair's Avatar
 
Join Date: May 2010
Location: Minnesota
Posts: 2,052
Default

Conduit


Quote:
Originally Posted by Jim Port View Post
You might be able to braze EMT sucessfully, but I doubt that it will ever end up tender if you braise it.

braise (brz)
tr.v. braised, brais·ing, brais·es To cook (meat or vegetables) by browning in fat, then simmering in a small quantity of liquid in a covered container.

Sorry John, just couldn't resist.
This should help....................
an·neal


a : to heat and then cool (as steel or glass) usually for softening and making less brittle
a7ecorsair is offline   Reply With Quote
Old 08-29-2010, 11:20 AM   #10
Member
 
Join Date: Jun 2007
Posts: 3,503
Default

Conduit


Quote:
Originally Posted by Jim Port View Post
You might be able to braze EMT sucessfully, but I doubt that it will ever end up tender if you braise it.

braise (brz)
tr.v. braised, brais·ing, brais·es To cook (meat or vegetables) by browning in fat, then simmering in a small quantity of liquid in a covered container.

Sorry John, just couldn't resist.
That's okay Jim. I had it coming.
J. V. is offline   Reply With Quote
Old 08-29-2010, 11:49 AM   #11
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Default

Conduit


if you are a decent welder and have a decent and appropriate welder, EMT can be welded successfully as well.
nap is offline   Reply With Quote
Old 08-29-2010, 04:04 PM   #12
Newbie
 
Join Date: Aug 2010
Location: Southern Illinois
Posts: 22
Question

Conduit


I want to thank you all for the great information on EMT and how to weld and or cook it...( lol )
My next question on this EMT matter is,,, How would I bend it into a nice looking 4 foot diameter? (No Corners or Abrupt Bends) ???
RDGreen is offline   Reply With Quote
Old 08-29-2010, 07:27 PM   #13
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 7,529
Default

Conduit


For a sweeping bend like you need you would use a hickey and make segmental bends. You would need to do some math to get both the angle and spacing worked out.
__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
Old 08-30-2010, 01:47 AM   #14
" Euro " electrician
 
frenchelectrican's Avatar
 
Join Date: Apr 2006
Location: WI & France { in France for now }
Posts: 5,369
Default

Conduit


For very large radius bending this what I used from time to time.



That useally do the trick with very large radius.

Merci.
Marc
frenchelectrican is offline   Reply With Quote
Old 08-30-2010, 04:38 PM   #15
Newbie
 
Join Date: Aug 2010
Location: Southern Illinois
Posts: 22
Default

Conduit


That is one impressive looking tool...
However it's probably got an impressive looking price on it too...
This will be most likely a one time deal so is there any ideas on making a tool from scrap steel or wood that will do the job for me???

RDGreen 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
PVC conduit - custom offset or bending tns1 Electrical 25 08-29-2011 05:56 PM
How to plug unwanted and leaking conduit? gernith General DIY Discussions 6 08-08-2010 12:09 PM
Warm and Noisy Electrical Conduit Intravartolo Electrical 4 07-26-2010 01:46 AM
Chicago Conduit Rules Wrigleyville Electrical 6 01-28-2010 06:49 PM
Sheathing/siding around conduit destroyer427 Building & Construction 1 10-20-2009 05:25 PM




Top of Page | View New Posts

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