ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
600 KW 120/208 3 Phase Y protection
by gfretwell. 07/20/17 01:02 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,175 Are you busy
174,570 Re: Forum
166,998 Need opinion
Who's Online Now
0 registered members (), 36 guests, and 6 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#73240 - 12/20/06 03:15 PM Conduit entrance into C1D2 classified area  
Rich Thomas  Offline
Member
Joined: Mar 2005
Posts: 48
Seattle, Washington, USA
Fourteen 1-1/4 inch conduits from a buried ductbank are entering an underground vault about 30'long x 20'wide x 20' high, classified Class I Div 2 hazardous area. Want to built the conduit system in a neat, workmanship like manner.

The entering conduits originate in an unclassified, above ground electrical space.

Conduit seals are required inside the underground vault near the wall penetrations before the conduit leaves the space.

The conduit inside the vault will be for feeders and control cables to electrical equipment and lighting.

If the seal is placed at the conduit penetration, the seal will be perpendicular to the wall and protrude into the room a few inches. This requires an elbow and a few conduit bends to bring the conduit against the wall when run parallel to the wall. This arrangement doesn't look to good to me because it protrudes into the room too much.

An elbow could be installed first on the "stub" into the room to put the conduit parallel to the wall, and then install the seal. But this method requires enough space between conduit stubs for installing the elbows.

How would you build the conduit entrance into the vault to minimize the distance between the conduit stubs and the space between the conduit and the vault wall as the conduit is routed parallel to the walls when run to the equipment?


Work Gear for Electricians and the Trades

#73241 - 12/20/06 05:06 PM Re: Conduit entrance into C1D2 classified area  
walrus  Offline
Member
Joined: Jul 2002
Posts: 680
Bangor Me. USA
Doesn't the seal have to be the first fitting into the vault??
Do you want the conduit to be heading upwards once it enters the vault?? why not bend the conduit so it does that, place the seal on the first thread??


#73242 - 12/20/06 05:14 PM Re: Conduit entrance into C1D2 classified area  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
First of all, check the Crouse-Hinds and Appleton catalogs; there are "elbow seals" made that just might work for you.

I would not try to get the pipe flush against the wall; this is an appication that screams for the use of strut.

If space is that tight, perhaps it would be better to relocate the seals to a point outside the 'zone,' then run the pipe to exactly where it is needed.


#73243 - 12/20/06 09:39 PM Re: Conduit entrance into C1D2 classified area  
walrus  Offline
Member
Joined: Jul 2002
Posts: 680
Bangor Me. USA
"elbow seals" or plugged ells would work if you want the direction of the pipe to be straight down.


#73244 - 12/20/06 11:10 PM Re: Conduit entrance into C1D2 classified area  
Rich Thomas  Offline
Member
Joined: Mar 2005
Posts: 48
Seattle, Washington, USA
The sealing elbow sounds like a good idea to me. Unfortunately, the only elbow type seal I've been able to locate is a 3/4" from Crouse-Hinds. The on-line catalogs from Killark, Appleton, Thomas&Betts, and others don't list a sealing elbow, only straight elbows.

Are there any suggestions where I might find the 1-1/4 inch variety?



Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 810
Joined: April 2004
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.013s Queries: 14 (0.003s) Memory: 0.7685 MB (Peak: 0.9076 MB) Zlib enabled. Server Time: 2017-07-21 08:47:51 UTC