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 Post subject: 480 VAC, 3 Phase, 1200 Amp Switchboard
PostPosted: Mon Oct 24, 2011 12:27 pm 
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Joined: Tue Feb 02, 2010 12:19 pm
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Location: Charleston, SC
480 VAC, 3 Phase, 1200 Amp Switchboard that has a leaky roof above it.

Can this wait another 6 months?


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E3.0, XFMR-4 & XFMR-5 & USS-4.pdf [258.66 KiB]
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E2.2, XFMR-3 & USS-3 reviewed Oct 2011.pdf [121.1 KiB]
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PostPosted: Mon Oct 24, 2011 2:29 pm 
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Looks like they have considered NEC 312.2

...enclosures within the scope of this article shall be placed or equipped so as to prevent moisture or water from entering and accumulating within the cabinet...

Not sure this version of "equipped" qualifies :eek:


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PostPosted: Tue Oct 25, 2011 10:10 am 
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Location: Charleston, SC
The Switchboard was determined to be safe and leak collection devices are working.

This 1200 Amp, Westinghouse POW-R-LINE Switchboard (4/87) is fed from a 1000 KVA Transformer (40.5 Cal/CM Squared) to the Switchboard disconnect (38.7 Cal/CM Squared), which feeds 2 sections of 480 VAC, 3 Phase Loads (21 Cal/ CM Squared). Roof might be replaced in six months (No kidding).


"We are aware of all the issues with the leaking roof and are in the process of having repairs made. (Long time coming). A safety walkdown was performed on 9-22-11 when the additional leak was first identified over the Electrical MCC. At that time the Facility Custodian had safety, Electrical and several E& I mechanics perform a walkdown to ensure the area was safe. The area was determined to be safe and leak collection devices were installed to prevent water from getting on the MCC. The roof repair crew came out and made temporary repairs and request was issued to the maintenance to perform inspections anytime it rained. An additional walk down was performed on 11-6-11 by the Facility Custodian and Engineering to ensure conditions had not changed and the MCC was still safe. Between 9-22-11 and today the Facility Custodian has performed numerous walkdowns to ensure the leak collection device is working and the Facility Custodian has found no water in that collection container, but other areas are still a concern and will be addressed as needed until repairs can be made. Numerous work requests have been issued in the past months for repairs on the roof and the A/C drain problems, some problems have been fixed and some still need additional work."


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PostPosted: Tue Oct 25, 2011 11:19 am 
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Location: Connecticut
I've seen quite a few of these. Won't spend money to fix a leaking roof but will spend thousands to replace blown up panels.


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PostPosted: Tue Oct 25, 2011 12:47 pm 
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Joined: Mon Jan 18, 2010 11:35 am
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Location: Wisconsin
They said roof repairs have been made. They have added additional drip protection.

I have seen much worse on construction sites that won't get a roof until after the spring thaw.

Hey, remember - planned shut downs are never possible, but unplanned ones we are willing to tolerate. :rolleyes:


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PostPosted: Fri Oct 28, 2011 6:45 am 
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Location: Charleston, SC
Does the Arc Flash calculation in 2008 remain valid with water in the Switchboard?

This seems really sad to me, I hope all goes well until January 2012?

"Talking to Operations and Support Facility Administrator who is in charge of this and other buildings , it is understood that procurement is planning on sending out invitation for bids next week and if everything goes as planned, the replacement roof work may be completed by end of January 12, 2012. Some of the leaks are due to old rusting air conditioning equipment. The leaks are being monitored for slipping and electrical hazards. The area management is aware of the conditions at this building."


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PostPosted: Fri Oct 28, 2011 8:12 am 

Joined: Fri Jul 20, 2007 5:00 pm
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At least it looks like they are moving forward for a permanent solution and were good enough to use a band-aid while you wait. It is unfortunate that sometimes the corporate process takes a long time to accomplish important goals. What seems important to us for some reason does not always seem important to those upstairs - Unless someone is injured then everyone drops everything and spend what ever it takes.


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PostPosted: Wed Nov 02, 2011 7:48 pm 

Joined: Sat Oct 22, 2011 6:52 pm
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AJS wrote:
480 VAC, 3 Phase, 1200 Amp Switchboard that has a leaky roof above it.

Can this wait another 6 months?


We have been working in an MCC that sometimes has black liquor that leaks through the roof. Looking at all of the stains on the floor and some equipment, it has been going on for years. Maybe since the mid 70's, when it was installed.


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 Post subject: Re: 480 VAC, 3 Phase, 1200 Amp Switchboard
PostPosted: Fri Nov 21, 2014 2:56 am 

Joined: Fri Nov 21, 2014 2:51 am
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Here is what happens when you PM a breaker but forget to remove the meggar lead after the test .

It makes a good case for a physical inspection prior to racking in.

It also makes a better case for remote racking

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