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sizing nuetral for M.C.C. #30717
10/26/03 12:14 PM
10/26/03 12:14 PM
Tim Peters  Offline OP
Joined: Mar 2003
Posts: 10
I have a MCC feeding a 600 amp 277/480 4 wire MCC. I'm using parallel 500mcm for the phases but there is no actuall load on the neutral so can I get away with no neutral? My concern is that the blue prints list it as 4 wire so do you think they want a neutral pulled for future use maybee?

Any info appreciated.

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Re: sizing nuetral for M.C.C. #30718
10/26/03 11:39 PM
10/26/03 11:39 PM
nesparky  Offline
Joined: Jun 2001
Posts: 642
Where is this MCC getting it's control power from?
If the plans and specs call out 4 wire, I would install a full size neutral. You cannot know what is planned for the future unless all the MCC buckets are used now.

Re: sizing nuetral for M.C.C. #30719
10/27/03 05:32 AM
10/27/03 05:32 AM
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
If the plans called for a four wire feeder to this MCC and you bid it and won it with that requirement you should install it.

Putting aside that it is the right thing to do, if after you leave the job they need that neutral who do you think will pay for it to be installed?

Bob Badger
Construction & Maintenance Electrician
Re: sizing nuetral for M.C.C. #30720
10/27/03 09:13 PM
10/27/03 09:13 PM
Tim Peters  Offline OP
Joined: Mar 2003
Posts: 10
One bucket of the mcc is feeding a transformer which in turn id feeding a 120/208 panel. This panel is feeding two controll panels for all my controll wiring.
Each bucket of the mcc has a TRF for the coils within it.

I did not bid the job but the nuetral was included in the bid so IMO it should be included but my superiors think different.

This post is mostly meant to justify my thinking, I wanted to make sure I wasnt missing something.

Re: sizing nuetral for M.C.C. #30721
10/27/03 09:19 PM
10/27/03 09:19 PM
Ryan_J  Offline
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
I would send an RFI to the engineer and get a CCD on paper to cover your back.

Ryan Jackson,
Salt Lake City
Re: sizing nuetral for M.C.C. #30722
10/28/03 06:05 AM
10/28/03 06:05 AM
zapped208  Offline
Joined: Feb 2003
Posts: 197
Somewhere in USA
Tim,- Was an equip. gnd. pulled in?, since someone is trying to cut corners on your job?

Shoot first, apologize later.....maybe
Re: sizing nuetral for M.C.C. #30723
10/28/03 04:36 PM
10/28/03 04:36 PM
Tim Peters  Offline OP
Joined: Mar 2003
Posts: 10
Yes a equipment ground will be pulled in

Re: sizing nuetral for M.C.C. #30724
10/28/03 09:40 PM
10/28/03 09:40 PM
Pinemarten  Offline
Joined: Aug 2003
Posts: 123
Edmonton, AB, Canada
I feel it is up to the owner.
Now cost vs. later. Explain the cost at a later date.
If he wants to save money at this point, he may want to.
I also agree with paper from the engineer, CYA.


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