Classified expansion fitting?

Status
Not open for further replies.
G

greenspark1

Senior Member
Location
New England
I have a number of conduits coming into a hazardous area from underground. When they come above ground I will seal them with a EYS fitting and would like to put an expansion fitting on them to account for frost movement. But are they rated for Class I areas? I don't see it listed on a cut sheet:
http://www.cooperindustries.com/con...inds/commercial-products/catalog-pdfs/xjg.pdf

How do other people account for conduit movement in similar situations? Thanks!
 
Install underground raceway so it is below the frost line and make sure whatever it attaches to is on a foundation below the frost line as well.

This is good idea even if using flexible couplings to keep movement fairly minimal. Frost heave can sometimes move things fairly significant distance, your flexible coupling needs some bend in it if the raceway is expected to need to be longer at some point, if installed straight and then length needed increases - something will have to give up.
 
Thanks for the replies, good idea. Do you typically just use liquidtight with an external bonding jumper?

I try to keep conduit below frost line but no one likes to dig that deep around here in Maine. The client hasn't seen any busted conduit/clamps yet at other locations so is very reluctant.
 
In Division 2, unless the fitting is required to be explosionproof, the expansion fitting you indicated is acceptable when used with a bonding jumper. See the second paragraph of UL DWTT.GuideInfo. The Crouse-Hinds expansion fittings have an "E-number" of E7008.
 
Last edited:
rbalex said:
In Division 2, unless the fitting is required to be explosionproof, the expansion fitting you indicated is acceptable when used with a bonding jumper. See the second paragraph of UL DWTT.GuideInfo. The Crouse-Hinds expansion fittings have an "E-number" of E7008.
Click to expand...

Brilliant! Div 2 exceptions strike again. Thanks for keeping us on track rbalex. And nice job digging into the UL!

Thanks for the C-H links, I really couldn't find them through the website.
 
rbalex said:
I don't recommend them for your application though- they don't really expand too much.
Click to expand...
No good for expansion in a straight line, but I would think that they would work when installed with either an offset or an S curve. Depends on the length you use and the allowed bending radius.
Buried, probably not so good though.:)
 
GoldDigger said:
No good for expansion in a straight line, but I would think that they would work when installed with either an offset or an S curve. Depends on the length you use and the allowed bending radius.
Buried, probably not so good though.:)
Click to expand...
Have you ever tried to form an "S - curve" with an explosionproof coupling? Their basic application is outlined in Section 501.10(A)(2). They are also incredibly expensive - in the petrochem industries, we call them "golden rope".
 
greenspark1 said:
Brilliant! Div 2 exceptions strike again. Thanks for keeping us on track rbalex. And nice job digging into the UL!

Thanks for the C-H links, I really couldn't find them through the website.
Click to expand...
It isn't an exception, its the general rule. [Section 501.10(B)(4)]

If you intend to be in the business for very long, get familiar with the UL Online Certifications Directory. It's the UL White Book on steroids and more up to date.
 
Last edited:
Status
Not open for further replies.
Top