ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Lock-down Thread
by NORCAL - 02/26/21 07:28 AM
Northern Tool Recalls Powerhorse Generators
by Admin - 02/25/21 09:49 PM
You will never guess
by gfretwell - 02/25/21 07:48 PM
New tool
by SMOKEYBOB - 02/15/21 04:59 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 17 guests, and 18 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Underground Feeders to fire pump #206953 09/07/12 08:48 AM
Joined: Jul 2012
Posts: 6
B
beatricellc Offline OP
New Member
In a Chicago high rise, feeders to a fire pump are below the floor of a parking garage. Fire pump controller is from around 1959. 480V 3 phase/ 150hp.

About 250' from the meter, there is a junction box in the floor. It is about another 100' to the fire pump. There is 3" conduit, and fiber bushings, at opposite ends of the rectangle shaped box. The box is falling apart. The conduit end, at the fire pump side of the box, is collapsing and closing in on the wire. There are 3 feeders. The insulation from one of the feeders is not cut but is "bulging" from the squeeze.

If after I megger the wire and find it to be OK. Can I just repair the damaged feeder? Is it acceptable to "sleeve" the damaged conduit end with an insulator?

2017 / 2014 NEC & Related Books and Study Guides
Re: Underground Feeders to fire pump [Re: beatricellc] #206954 09/07/12 09:24 AM
Joined: Apr 2002
Posts: 7,233
HotLine1 Offline
Member

That answer is best for you IF it comes from the local AHJs.


John
Re: Underground Feeders to fire pump [Re: beatricellc] #206955 09/07/12 11:35 AM
Joined: Jul 2012
Posts: 6
B
beatricellc Offline OP
New Member
What is an AHJ?

Re: Underground Feeders to fire pump [Re: beatricellc] #206956 09/07/12 11:48 AM
Joined: Mar 2005
Posts: 212
G
Gregtaylor Offline
Member
Authority Having Jurisdiction. Inspectors.

Re: Underground Feeders to fire pump [Re: beatricellc] #206957 09/07/12 01:08 PM
Joined: Jul 2004
Posts: 9,569
G
gfretwell Offline
Member
I agree with John. Get your local electrical inspector in there, show him the problem and see what you can work out.

From the sound of it, you might be chipping up some floor. These days with diamond saws and air tools, it is usually not that big a deal. You might be meeting a guy from the concrete worker's union tho (in Chicago).

Once you get it opened up you should be able to get back to clean pipe and extend it a little, into your new enclosure or just use a bigger box.


Greg Fretwell
Re: Underground Feeders to fire pump [Re: beatricellc] #206958 09/07/12 05:54 PM
Joined: Jul 2012
Posts: 6
B
beatricellc Offline OP
New Member
Thanks. I was looking into cutting the floor and a new box as the next option.

Re: Underground Feeders to fire pump [Re: beatricellc] #206959 09/07/12 07:34 PM
Joined: Apr 2002
Posts: 7,233
HotLine1 Offline
Member
The point of where I was going with a suggestion is that you should have a talk with the electrical inspector, and possibly the fire inspector before you plan any repairs.

Discussion regarding what is acceptable, and providing details (sketch) is a lot easier than doing something & not having it approved.


John

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
Joe Tedesco
Joe Tedesco
Boston, Massachusetts USA
Posts: 2,749
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
MCosta 3
Popular Topics(Views)
275,403 Are you busy
209,295 Re: Forum
196,589 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3