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Joined: Jul 2012
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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?
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Joined: Apr 2002
Posts: 7,413 Likes: 8
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That answer is best for you IF it comes from the local AHJs.
John
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Joined: Jul 2012
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Joined: Mar 2005
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Authority Having Jurisdiction. Inspectors.
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Joined: Jul 2004
Posts: 10,015 Likes: 37
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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
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Joined: Jul 2012
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Thanks. I was looking into cutting the floor and a new box as the next option.
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Joined: Apr 2002
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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
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Joined: July 2013
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