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high voltage

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dr sportster
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PostPosted: Thu Oct 12, 2017 9:30 am    Post subject: Re: high voltage Reply to specific post Reply with quote

I mean I can explain it with a drawing.
 
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David G
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PostPosted: Thu Oct 12, 2017 11:09 am    Post subject: Re: high voltage Reply to specific post Reply with quote

I would think you would blow out all the lights on the opposite phase when the motor tried to start.
 
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woodbutcher
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PostPosted: Thu Oct 12, 2017 1:22 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

I opened the disconnect box below the panel in the shop where the UF cable goes underground to the tractor shed. It is in conduit from the box to 24" below ground. All three conductors are insulated. I noticed that the lip of the conduit is blackened where the neutral/ground conductor goes into the conduit, and the insulation on that conductor is bubbled like it had melted, but no bare metal was showing. I recall now that I had to replace the cable that comes into the ground bar from the ground rod about a year ago due to a lightning strike to the weatherhead on this meterbase. When it burned through the grounding cable, it could have sent enough juice through the neutral buss bar to melt the neutral through also. I'm thinking about abandoning that neutral conductor and going overhead with a single bare conductor to the subpanel in the tractor shed. Is there anything wrong with that idea? I'll probably abandon the ground rod at the subpanel, also.
Thanks for all your suggestions that helped me know where to look.
Butch
 
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dr sportster
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PostPosted: Thu Oct 12, 2017 3:09 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

No you can not run a single wire overhead . Probably about ten different violations of code. Clean and megger the neutral.
 
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David G
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PostPosted: Thu Oct 12, 2017 3:12 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

No, conductors should be run together.
 
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woodbutcher
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PostPosted: Thu Oct 12, 2017 4:00 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

How can I meggar the neutral?
 
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John T
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PostPosted: Thu Oct 12, 2017 4:36 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

NOOOOOOOOOOOOOO don't run a single separate Neutral

NOOOOOOOOOOOOOO don't abandon the ground at the sub panel

YESSSSSSSSSSS repair the bad Neutral

When in doubt about electrical safety CONSULT THE NEC and professional electricians and local authority and don't bet the farm or risk your life or a fire based on what Billy Bob or Bubba or your brother in law has to say lol

John T Retired Electrical Power Distribution Design Engineer
 
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glennster
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PostPosted: Thu Oct 12, 2017 4:53 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

a meggar tests insulation resistance. an inexpensive meggar will run you a couple hundred bucks. a good one around a grand. see if you can find an electrician that has one. i doubt if you can rent one
 
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David G
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PostPosted: Thu Oct 12, 2017 5:05 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

Blistering of insulation indicates a lot of heat, it may have been caused by lightning, or poor connection. The conductor could be compromised at any point if it got direct hit by lightning. I do not know if it is aluminum or copper, but aluminum conductors will turn into an aluminum oxide powder if exposed to water due to failed insulation. You might end up replacing the whole segment, but best to hire an electrician to diagnose, they will have the proper equipment

What is the amp rating of the upstream breaker and gauge of wire; if smaller might just replace whole line yourself.
 
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Dusty MI
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PostPosted: Thu Oct 12, 2017 5:31 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

Water over the dam. But PVC conduit is rather inexpensive, Once a ditch is dug why not leave a hole before filling the ditch in/install some conduit ? Sure makes it rather easy to fix a problem later. Even maybe go with oversized conduit. Maybe tomorrow one may find that they need more power.

Dusty
 
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kevinthefixer
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PostPosted: Thu Oct 12, 2017 6:40 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

Dusty MI wrote:
(quoted from post at 18:31:56 10/12/17) Water over the dam. But PVC conduit is rather inexpensive, Once a ditch is dug why not leave a hole before filling the ditch in/install some conduit ? Sure makes it rather easy to fix a problem later. Even maybe go with oversized conduit. Maybe tomorrow one may find that they need more power.

Dusty

Or fiber optics. Or something. Good idea.
 
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kevinthefixer
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PostPosted: Thu Oct 12, 2017 6:41 pm    Post subject: Re: high voltage Reply to specific post Reply with quote

Oh and run a fish-wire or two through it.
 
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woodbutcher
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PostPosted: Fri Oct 13, 2017 2:17 am    Post subject: Re: high voltage Reply to specific post Reply with quote

A professional is on the way today.
Butch
 
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John T
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PostPosted: Fri Oct 13, 2017 3:16 am    Post subject: Re: high voltage Reply to specific post Reply with quote

Wise choice, grasshopper

John T
 
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dr sportster
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PostPosted: Fri Oct 13, 2017 7:45 am    Post subject: Re: high voltage Reply to specific post Reply with quote

Call any contractor -- they should have the meter.
 
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