ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Flexible Conduit?
by gfretwell - 10/24/21 01:59 AM
May I backfeed 3 phase transformer?
by dsk - 10/22/21 04:37 AM
Wire sizing
by gfretwell - 10/21/21 10:12 PM
GFCI's pops in large numbers
by dsk - 10/21/21 02:03 AM
Need some info on Japanese outlets, 200V 15A
by andey - 10/20/21 08:05 AM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 14 guests, and 15 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jul 2004
Posts: 783
L
LarryC Offline OP
Member
What is the correct method to install a feed-thru thru a wall?

I am envisioning a 6" square box with a cover, on each side of the wall and 2 short pieces of 2" EMT connecting the two boxes.

The feed-thru would be used to run temporary power, communication cables, liquid lines, etc. Obviously the covers would be installed when the pass-thru is not in use.
One side of this feed-thru is in a conditioned space and the other side is the building's loading dock.

Thanks,

Larry C

Joined: Apr 2002
Posts: 7,283
Likes: 3
Member
Larry:
Is it a fire-rated wall??
Condensation may also be an issue.


John
Joined: Jan 2005
Posts: 5,316
Cat Servant
Member
This is primarily a design issue, but a good one for discussion.

For a fire rated wall, the key is to restore / maintain the fire resistance of the wall. Even for a 'normal' wall, the idea is to keep noise, drafts, etc., from passing through.

The method you propose isn't bad ... though I would use 'running thread,' rather than trying to get nipples to to be the right size. I'm a bit puzzled as to why you would want two nipples though ... keep in mind that all conductors of a circuit need to be run in the same nipple, and that you need a partition between low voltage and power cables.

Easier to do, perhaps, is to install one of the commercially available fire-stop products. These are nicely made tubes, flanges on either side .... and large enough to pass your pipes through. You seal the remaining gaps with the appropriate products, and all is well.

How to make the necessary holes in the wall? A roto-hammer, with the appropriate core drill, makes easy work of the chore.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
RH1
RH1
California
Posts: 22
Joined: August 2009
Top Posters(30 Days)
dsk 7
Popular Topics(Views)
284,844 Are you busy
217,413 Re: Forum
203,732 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5