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#36135 - 03/29/04 08:54 PM PM Schedule for service and MCC's  
Elzappr  Offline
Member
Joined: Dec 2001
Posts: 270
Oregon
Anyone know of a publication that gives recommendations for timing/scheduling PM's for service switchgear and mcc's? Is a 3 year cycle too frequent?


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#36136 - 03/29/04 09:50 PM Re: PM Schedule for service and MCC's  
Ron  Offline
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Joined: Mar 2002
Posts: 582
White Plains, NY
NFPA 70B Recommended Practice for Electrical Equipment Maintenance 2002 Edition
Table I1 suggests even more often than that.


Ron

#36137 - 03/30/04 01:20 AM Re: PM Schedule for service and MCC's  
Bjarney  Offline
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Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Elz—

NETA has a (free!) download of their recommended maintenance intervals www.netaworld.org/files/ItemFileA42.pdf

Also (free!) www.usbr.gov/power/data/fist/fist4_1b/fist4_1b.pdf

And (free! pdf) nema.org/index_nema.cfm/1427/249D1875-9DE0-4504-9581AB15872B1988


#36138 - 03/30/04 01:47 AM Re: PM Schedule for service and MCC's  
Elzappr  Offline
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Joined: Dec 2001
Posts: 270
Oregon
Yeah! I suspected that there was an NFPA publication dealing with PM stuff. Thanks Ron.
I'll look into the Neta site, Bjarney. I confess that I'm not familiar with "neta".

Do we need to consult with manufacturers of all our equipment to get the real scoop for good timely predictive/preventive maintenance?


#36139 - 03/30/04 05:29 PM Re: PM Schedule for service and MCC's  
Bjarney  Offline
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West-Southern Inner-Northeast ...
Elz—

NETA members' prime business is electrical-equipment testing of new gear (acceptance testing) and existing stuff (maintenance testing).


#36140 - 03/31/04 12:42 AM Re: PM Schedule for service and MCC's  
Elzappr  Offline
Member
Joined: Dec 2001
Posts: 270
Oregon
This afternoon I finally got a chance to see and quickly review the NETA site, and other links. What I'm dealing with is justifying a pm schedule for the electrical service and distribution panelboards and associated transformers and wiring for office buildings that are at least 10 years old. I see a 3 to 6 year pm frequency listed throughout the 70B table for low voltage equipment, along with some scattered comments to "follow manufacturer's maintenance instructions". Are such maintenance instructions readily available, and are they practical? Or is this something that only electrical test companies are privy to? How do I find info that tells me that a certain brand and model of drawout breaker is likely to fail after x years? I suspect that this is more of an 'insider's specialty', and that the manufacturers aren't about to share that sort of failure info if they don't have to.
I realize that I'm fishing for concrete answers where there might not be any, but I appreciate any input offered. Thanks


#36141 - 03/31/04 01:46 AM Re: PM Schedule for service and MCC's  
Bjarney  Offline
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Posts: 2,527
West-Southern Inner-Northeast ...
There are no easy answers. If literature is not available from the manufacturer, particularly for older gear, then experience is more important. If a facility owner has not lost money from unmaintained gear, then it can be a though sell.



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