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Thread: Over-voltage damage.

  1. #1
    Join Date
    Aug 2005
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    Northern Va
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    286

    Over-voltage damage.

    I'm wondering if the NFPA or NEMA or perhaps insurance companies have a standard for certifying repairs to residential wiring after an exteme over-voltage. I have a customer who had a 19.9KV primary get into his service conductors which did extensive damage to his home. Want to CMA.

  2. #2
    Join Date
    Jul 2008
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    774
    We had a customer who found half his appliances burnt up when returning from work? He called us and when i found his main ground jumper burnt and all the insulation melted off i suspected his problem came in on the service drop. Then i went out to the truck and one of his neighbors came up and asked me to check his house too??? He also said one of his other neighbors had a kitchen fire that afternoon??? Found out the Power Company's sub contractor was working in a pad mount transformer and somehow energized the neutral !! Nothing was said to those customers who did not ask--i thought that was BS! I took care of that! The next day the Power Company's insurance agent was visiting those with damage(which was every house fed by this transformer). My first customer lost two TV's and recievers plus VCR's, micro,stove,dishwasher and some clocks.

  3. #3
    Join Date
    Feb 2006
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    You would need to meg every circuit to be sure
    Those who can do, those who can't teach

  4. #4
    Join Date
    May 2003
    Location
    Leesburg, VA
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    6,918
    Perform a visual inspection check all devices and megger all conductors as noted

    Ungrounded to grounded.
    Ungrounded to ungrounded where applicable.
    Ungrounded to Ground.
    Grounded to ground.

    Check NETA Standards table for acceptable values

    I have stated this before and this is where just buying the test equipment is not enough. NOTHING but NOTHING beats hands on experience, a good understanding of the situation at hand, a through visual inspection and the knowledge to use the test equipment and then blend all of the above into a concise detailed explanation and report. Because everyone wants a paper trail.
    Last edited by brian john; 03-24-09 at 11:48 AM.
    Brian John
    Leesburg, VA

  5. #5
    Join Date
    Mar 2006
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    Westchester County, New York
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    Quote Originally Posted by Rewire View Post
    You would need to meg every circuit to be sure

    I agree, and a visual of all the circuitry that can be seen does not hurt either. Attics, outside, basements, closets, equipment, etc...
    Instructor, Industry Advocate

  6. #6
    Join Date
    Aug 2005
    Location
    Northern Va
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    286
    Went and looked at this house today. The damage I could see was:
    This guy has all x10 type switches throughout...none working properly.
    T'sat for under floor heat, all GFIs, microwave, dishwasher, disposal, range, all his stereo equipment, numerous TVSSs, dog fence, irrigation, several breakers, 2 elec furnaces already repaired, heat pumps already repaired. Two lamps blew out of their fixtures.
    All his little plug-in type transformers (numerous) were roached.
    My recommendation was to call MET ( http://www.met-test.com/) in Baltimore to see about megging out the house. Also to call the City inspectors and see what they had to say. I'm bringing in my LV guy to sell him replacing all the old smart house type equipment with new equipment. This guy has windows that open, stereos that turn on, etc etc all through his old system. I'm giving him a price on replacing GFIs, smoke detectors, all the breakers in the service, and the 120 volt smart house type switches. I gave him a price on megging the house out myself but having never done it before... thought MET might be the better choice. I told him that megging the house out was no guarantee that all would be fixed. I'm not too thrilled at putting my name on megger testing this house. All this has to go thru his HO insurance adjuster.
    The guy who hit the pole that dropped the primary.....his insurance co says they are already maxed out on his million dollar policy. They had to replace 150 electronic meters at the condos next door. He landed on the wrong spot in the game of life that day.

    Anyone know what a ducter(?) test is? For breakers.
    Last edited by fisherelectric; 03-24-09 at 03:10 PM. Reason: to add

  7. #7
    Join Date
    May 2003
    Location
    Leesburg, VA
    Posts
    6,918
    Quote Originally Posted by fisherelectric View Post
    Went and looked at this house today. The damage I could see was:
    This guy has all x10 type switches throughout...none working properly.
    T'sat for under floor heat, all GFIs, microwave, dishwasher, disposal, range, all his stereo equipment, numerous TVSSs, dog fence, irrigation, several breakers, 2 elec furnaces already repaired, heat pumps already repaired. Two lamps blew out of their fixtures.
    All his little plug-in type transformers (numerous) were roached.
    My recommendation was to call MET ( http://www.met-test.com/) in Baltimore to see about megging out the house. Also to call the City inspectors and see what they had to say. I'm bringing in my LV guy to sell him replacing all the old smart house type equipment with new equipment. This guy has windows that open, stereos that turn on, etc etc all through his old system. I'm giving him a price on replacing GFIs, smoke detectors, all the breakers in the service, and the 120 volt smart house type switches. I gave him a price on megging the house out myself but having never done it before... thought MET might be the better choice. I told him that megging the house out was no guarantee that all would be fixed. I'm not too thrilled at putting my name on megger testing this house. All this has to go thru his HO insurance adjuster.
    The guy who hit the pole that dropped the primary.....his insurance co says they are already maxed out on his million dollar policy. They had to replace 150 electronic meters at the condos next door. He landed on the wrong spot in the game of life that day.

    Anyone know what a ducter(?) test is? For breakers.

    Fisher I did not realize this job was in my service area.

    Ducter, Ductor, Micro-ohm meter, contact resistance meter, Places a know voltage and current across typically the contacts of a switch or CB and calculates resistance. But can be utilized to check the contact resistance of bus joints, terminal connections, ETC...
    Brian John
    Leesburg, VA

  8. #8
    Join Date
    Aug 2005
    Location
    Northern Va
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    286
    Brian....check your PMs

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