[RE-wrenches] Expansion joints

Thu Mar 31 17:21:46 PDT 2011

http://www.steelconduit.org/pdf/ConGuide.pdf

page 16

The NEC does not directly dictate when expansion coupling are required for
EMT.

300.7 merely says to accommodate for expansion. 

If PVC requires it for ¼ in of movement and you extrapolate, then 100ft of
steel conduit exposed to a 35 degree temperature difference would require an
expansion coupling.

I’m counting on about 100-120 degrees of temperature difference for steel
conduit on a rooftop. That’s 32 or 26.6 ft of pipe, respectively.

regards,

Erika

REpower SOLUTIONS

www.repowersolutions.com

P: 216.268.2275

C: 216.402.4458

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Hans
Frederickson
Sent: Thursday, March 31, 2011 12:02 PM
To: 'RE-wrenches'
Subject: [SPAM] Re: [RE-wrenches] Expansion joints

See the FPN for NEC 300.7(B). You take the values in Table 352.44 and
multiply by 0.2 for steel conduit.

-Hans

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark Dickson
Sent: Thursday, March 31, 2011 8:27 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Expansion joints

Are there any usage charts to tell you when or how to use expansion joints
in EMT?  The NEC has one for PVC, but what do you refer to for EMT?

Best regards,

Mark Dickson,

NABCEP Certified Solar PV Installer ™

Oasis Montana Inc.

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Hans
Frederickson
Sent: Thursday, March 31, 2011 9:15 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Expansion joints

We used an OZ-Gedney expansion coupling for 1-1/4" EMT on a recent job. The
part # is TX-125 for 1-1/4", and it would be TX-150 for 1-1/2". It is the
same as the OZ-Gedney AX expansion coupling for rigid conduit, but uses a
rigid nipple and EMT connectors to adapt to EMT. The assembly is UL listed.

-Hans

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Erika
Weliczko
Sent: Wednesday, March 30, 2011 5:54 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Expansion joints

I recently used a Hubbell Killark product for rigid/IMC and was not happy
with how the threads of the coupling engaged in factory conduit threads.

Crousehinds XJG-EMT series is intended for EMT. And is described as being
used indoors or outdoors. The EMT couplings mostly seem to be compression.

REpower SOLUTIONS

www.repowersolutions.com

P: 216.268.2275

C: 216.402.4458

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jamie
Johnson
Sent: Tuesday, March 29, 2011 2:33 PM
To: RE-wrenches
Subject: [SPAM] Re: [RE-wrenches] Expansion joints

Peter,

Cooper makes one for 1.5" emt, not sure if it is rated for wet locations or
not.

part #XJG54 EMT, it allows for up to 4" max of conduit movement.

Jamie Johnson

NABCEP Certified PV Technical Sales Professional

NABCEP Certified Solar PV Installer

General Manager

SOLAR POWER ELECTRIC

-------- Original Message --------
Subject: [RE-wrenches] Expansion joints
From: "Peter Parrish" <peter.parrish at calsolareng.com
<http://peter.parrish@calsolareng.com%3e> >;
Date: Tue, March 29, 2011 1:04 pm
To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>

Does anyone have information (manu and part number) for expansion joints for
1-1/2 EMT? I have also heard that many EJs are designed for rigid conduit
(RMC) and may not be directly applicable to EMT.

- Peter

Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parrish at calsolareng.com 
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885

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