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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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29th Jan 2023, 2:11 pm | #1 |
Hexode
Join Date: Dec 2018
Location: Lugo, Spain
Posts: 477
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Rural mains post to post street twin wiring
Seems like this was the best section for this question.
I have acquired a small haul of this twin wire from a rural wiring refit . I suppose you could call it twin wire . The conductors not bonded together just two copper conductors that are insulated with a thick black heavy duty insulation at first i thought it was HD twin but no, they are very loosly twisted together and can be easily separated. The copper conductors are almost 2mm diametre ( 1.9mm ) and solid , not flex strands. My question is what could this black insulation be made from and what might be its Substrate Dielectric Constant, it is highly durable and has been there for years in all weathers but looks like new !!!. I,m im trying to get some kind of an idea for a twin line feeder calculator answer for a dipole aerial. https://www.dosupply.com/tech/2021/1...it-calculated/ |
29th Jan 2023, 2:17 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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Re: Rural mains post to post street twin wiring
2mm sounds very thin for mains wiring, unless it was used for something low powered like street-lighting.
Not sure what the setup is over in Spain, but here in the UK a lot of the old single-uninsulated-and-ceramic-insulators overhead wiring is now being replaced by what they call ABC - Aerial Bundled Cable - https://en.wikipedia.org/wiki/Aerial_bundled_cable
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I'm the Operator of my Pocket Calculator. -Kraftwerk. |
29th Jan 2023, 3:01 pm | #3 |
Hexode
Join Date: Dec 2018
Location: Lugo, Spain
Posts: 477
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Re: Rural mains post to post street twin wiring
It handles the new LED re fit street lights. Every rural house here also has its own council supplied and maintained light fitted to the corner of the house to light the path and door way. So i can only assume they refitted the whole area with new wires post to post as they had a 4wd with a very large wooden cable drum of the stuff and all new cable clamps.
I interested in the black covering and what its dielectric constant might be ?. |
29th Jan 2023, 3:26 pm | #4 | |
Heptode
Join Date: Feb 2022
Location: Leicestershire, UK.
Posts: 690
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Re: Rural mains post to post street twin wiring
Quote:
I have seen very similar wires terminating on the Supply fuse in the bottom of a LED street light when it was being repaired. Rog |
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29th Jan 2023, 3:33 pm | #5 |
Hexode
Join Date: Dec 2018
Location: Lugo, Spain
Posts: 477
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Re: Rural mains post to post street twin wiring
Looked at a site for dielectrics for cables , it might be Polyethylene ( high density ) ?.
here and there they are doing quite a bit of work for improvements , in town out of town. |
29th Jan 2023, 5:04 pm | #6 |
Nonode
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,152
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Re: Rural mains post to post street twin wiring
The copper core may be alloyed with other metals to make it harder and less likely to stretch and get corrosion.
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30th Jan 2023, 10:30 am | #7 |
Hexode
Join Date: Dec 2018
Location: Lugo, Spain
Posts: 477
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Re: Rural mains post to post street twin wiring
Well thanks for replies , i think its heading for an antenna for HF use.
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