ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 16
Recent Posts
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
Dining room plugs
by watersparkfalls. 03/21/17 10:31 PM
by jraef. 03/21/17 09:13 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,421 Are you busy
166,141 Re: Forum
160,595 Need opinion
Who's Online Now
1 registered members (ComputerWizKid), 51 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#61505 - 01/26/06 06:42 PM Compression Couplings  
master66  Offline
Joined: Apr 2002
Posts: 257
Masontown, PA, USA
Is there any time that it is MANDATORY (required by NEC)to use compression coulpings as opposed to set screw on EMT conduit?

I am running a 4" EMT conduit through a store to feed a store next to it and I started wondering...

Work Gear for Electricians and the Trades

#61506 - 01/26/06 06:50 PM Re: Compression Couplings  
bot540  Offline
Joined: Sep 2004
Posts: 174
Vernon Hills, IL
I don't believe the nec even mentions compression or set screw connectors. They're both listed. I could be wrong.
Your installation isn't in violation of 230.3, is it?

Jesus may have been a capenter,but God was an electrician.Genesis1:3

#61507 - 01/26/06 06:50 PM Re: Compression Couplings  
Dnkldorf  Offline
Joined: Dec 2004
Posts: 1,064
nowhere usa
I changed my answer from outside, to no.


[This message has been edited by Dnkldorf (edited 01-26-2006).]

#61508 - 01/26/06 08:32 PM Re: Compression Couplings  
e57  Offline
Joined: May 2003
Posts: 2,876
358.42 Couplings and Connectors.
Couplings and connectors used with EMT shall be made up tight. Where buried in masonry or concrete, they shall be concretetight type. Where installed in wet locations, they shall be of the raintight type.

Fittings have been tested for use only with steel EMT unless there is specific marking on the device or carton to indicate the fittings are suitable for use with aluminum or other material.
According to 358.6, only listed fittings are permitted to be used with EMT. According to UL 797, Electrical Metallic Tubing, listed fittings that are suitable for use in poured concrete or where exposed to rain are so indicated on the fitting or carton. The term raintight or the equivalent on the carton indicates suitability for use where directly exposed to rain. The term concretetight or equivalent on the carton indicates suitability for use in poured concrete. See 225.22 and 230.54(A) for raintight requirements as applied to raceways on exterior surfaces of buildings and to service raceways.
Indentor-type fittings are for use with metallic-coated electrical metallic tubing only and require a special tool supplied by the manufacturer for proper installation. Diametrically opposed indentor-type tools require two sets of indentations nominally 90 degrees apart. Triple-indent tools require one set of indentations.

This is the only NEC listing requirements for Rain-tight, and Concrete-tight. Most of which are compression styled. Unless you are otherwise required by ammendment by local AHJ, or job spec's?

Mark Heller
"Well - I oughta....." -Jackie Gleason

#61509 - 01/26/06 10:42 PM Re: Compression Couplings  
master66  Offline
Joined: Apr 2002
Posts: 257
Masontown, PA, USA
No. Not in violation of 230.3. There is going to be a 2 gang meter socket / disconnect on the outside of the building. Each of the two tennant spaces will be subfed from the meter socket.

Thanks for the replies guys.

Member Spotlight
L.I. New York
Posts: 94
Joined: August 2003
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.7669 MB (Peak: 0.9040 MB) Zlib enabled. Server Time: 2017-03-25 13:32:42 UTC