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Discussion Starter · #1 ·
I have a workshop behind my house that has a 100 amp service running to it. The power comes from the pole on the street to the house then from the house to the workshop. The shop has it’s own meter and a sub panel located next to the meter with it’s own power disconnect switch. After doing a bit of electrical work in the shop I decided to take a close look at the overhead service wires that run to the workshop . Upon inspection I noticed that there are some small cracks in the insulation. I cannot see the copper wires and there is no missing insulation but there are spots where there are little splits and I can see a bit of white oxidation on the outside of the cable. Makes me think a bit of water is able to make it in.

The wires are probably at least 40 years old and look like your standard service wire. Copper covered with a black plastic insulation. Two hots and a ground. All insulated. The wires run to the shop separately and are not warped or twisted together as they travel between the shop and house. They each have their own mounting point along the fascia and remain about 3 inches apart as they travel between the house and shop. The distance overall is roughly 25 feet.

I’m considering using either 3M 2228 Scotch Moisture Sealing Electrical Tape or Scotch Cable Jacket Repair Tape 2234 to put all three wires together (after their mounting points) and wrap the entire 25 foot run. This would hopefully keep the moisture out and overall extend the life of the insulation.

I understand in a perfect world I would replace the drop. Really can’t afford it now and doubt it is necessary given the circumstances. I do know the power needs to be off for me to be touching these service wires! As mentioned above there is a sub panel with disconnect switch after the meter that makes the overhead wires dead.

Would this be acceptable? Any issues with this? Is there a better product for me to use? Thank you for any help or advice.
 

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If you pull those 3wires together, they will probably short thru the deteriated insulation. It's more of a question of when it happens, not if.

You may significantly shorten the life of the wires, instead of increasing it.

BTW, that 3rd insulated wire should be a neutral, not a ground.
 

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Discussion Starter · #3 · (Edited)
Thanks for the reply. You're probably right. I didn't think the cracks looked big enough to short out but I guess it's possible and that would be bad.

What are my other options? What about wrapping each wire? They are pretty accessible from the roof and ladder.

Yes the other wire is a neutral. That makes sense.

Also is there anything I can use to space the wires apart along the run? Now they just hang there roughly 3 inches apart and swing around in the wind. Is there some kind of a spreader used in this situation to keep them apart and more secured?
 

· A "Handy Husband"
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Leave them be. Even if they were bare, they would work fine. Copper or aluminum only gets surface oxidation and does not hurt the integrity of the wire.
 
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Discussion Starter · #5 ·
So it's no big deal if the insulation is cracked? If I check you tube there are all kinds of videos, home inspections etc. making a big deal about cracks in overhead service wires.

I would love to be able to leave as is (shouldn't have looked - ha ha). Now that I looked I want it to be as good as I can make it without replacement.
 

· A "Handy Husband"
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So it's no big deal if the insulation is cracked? If I check you tube there are all kinds of videos, home inspections etc. making a big deal about cracks in overhead service wires.

I would love to be able to leave as is (shouldn't have looked - ha ha). Now that I looked I want it to be as good as I can make it without replacement.
Stop watching people on youTube and home inspectors, most of them are hacks.
 

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Leave them alone. Sounds like it's open wire secondary and if they are insulated odds of them slapping together and flashing on each other are rare. If it was bare copper it would have a chance of getting and flashing over, but not insulated wire. They do make spacers for open wire, but you could simply use some rigid plastic of your choice and cut a couple notches and tape it to the wires with electric tape to keep them apart. If it was me though, I wouldn't bother with it.


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If the shop has its own meter then it is not a sub panel but a second main panel.
It is a separate service from the house.

I believe the wires you are describing belong to the POCO since they are before the meter. So if they are a hazard to you then call the POCO for inspection and replacement.
 

· Electrician
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Leave them alone. That old hard drawn copper will outlast what they are attached to. There is no need to insulate them if they are separated. I am not sure why they ever insulated them other than to protect from incidental contact.
 

· In Loving Memory
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If the shop has its own meter then it is not a sub panel but a second main panel.
It is a separate service from the house.

I believe the wires you are describing belong to the POCO since they are before the meter. So if they are a hazard to you then call the POCO for inspection and replacement.
He said the wires are after the meter.
 

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Discussion Starter · #17 ·
Thank you for all of the helpful replies.

After reading the comments and doing some research it does look like the service wires running to my workshop are open wire secondary and most likely also hard drawn copper.

As a poster mentioned in a previous comment, it seems the black coating on this type of wire is there to avoid any incidental contact rather than to protect the wires. I was not familiar with this type of old wiring.

It is interesting to hear this type of wiring would be fine even with no insulation at all as long as they remain separated. Thus making my taping together plan a seriously bad idea!! I will not be doing that.

The good news is I can leave them as is and they will be fine. Thanks again!
 
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