LOOONNNGGG Underground Cable Run

[bdw593]

Did the same thing with bout 1000'. Sch 40 in ground sch 80 out of ground. Primed and glued joints, to co-op standards. Had elect inspector ok it before I filled in the trench. Then filled the trench. Then took orange hay twine and sucked it through with a regular shop vac, worked like a charm. Co-op won't use your pull rope, they will use your rope to pull their rope through. They provided all the lubricant etc for pulling wire. In 1000' pull I did not have to install pull boxes. Hope all goes well.. Also got a trick if you get water in the line how to get the rope through.. If you get into that predicament message me....

 

[dukmn]

Do I understand you to say the step down transformer will be on the pole and you will then run the low voltage service 1500 from the pole to where you need power?

Why not put a pad mount transformer near your service drop location and have the power company run an UG distribution service to it?

 

[Lineman North Florida]

I can't imagine a power company being willing to install a secondary run 1500' as some have stated earlier this is a job for the overhead ie poles and wire to be brung in closer or if you don't want that you could have them bring underground primary in that 1500' of pipe and have them place a padmount transformer closer to your house. Whatever you do don't go with direct burial, you have the right idea putting it in conduit and most definately glue the pipe joints, put glue on both the bell end of the conduit and the end that you slide into the bell. Good luck you will need it with a run of secondary cable that long.

 

[k0ua]

I cannot speak to exactly your situation as posted, but I can "me too" a couple of things.. All conduits will fill with water buried in the ground. for reasons already stated about condensate. Not saying you should not glue them tho, as you dont want them to accidently pull apart when backfilled. All that I have ever pulled in after a period of time were full of water. And I have successfully sucked a "mouse"with a vacuum cleaner thru 400 foot conduits many times easily.. I think it could go much longer, but 400 foot is the longest I have pulled in. After the vacuum gives out, comes "jetline" CO2 power that shoots a ball thru longer conduits. I don't know the limit though. The voltage drops worry me also. you can calculate it yourself by looking up the resistance of the wire, and estimating the current load, and plugging it into the Ohms law formula. I too dont understand why the power company is not bringing the high voltage feeder to you. Sorry I could not directly answer you questions.

James K0UA

 

[tommu56]

1500 ft isn't a problem

Use a bucket of jet line and a plastic bag stuffed with more bags to make a mouse the bucket of line will be less than $40.00 and a vacuum cleaner to suck the "mouse" through the pipe!

Amazon.com: Greenlee 37959 Poly Fish Line, Red Tracer, 2200': Home Improvement


I think you would be better if the transformer was closer to the house
(100') and run the high voltage to it.
I would do it all under ground with any second thoughts.

Just a opinion of a 30 year electrician!

Tom

 

[hawkeye08]

No problem with the underground, most of the ones I have seen have the transformer at the house end for that long (and the power company maintains the line to the transformer).

 

[beppington]

No problem with the underground, most of the ones I have seen have the transformer at the house end for that long (and the power company maintains the line to the transformer).

Exactly what I have, but only 450' long underground from power pole to the transformer set near the future house.

 

[leonz]

:confused2:.. Go to your local utility that is going to do the work and "ASK" what they want and what they are planning to supply,, Some of the infomation here is going to out in left field somewhere,,

Just which part of the information I have provided
here is going out into left field???????

 

[leonz]

I cannot speak to exactly your situation as posted, but I can "me too" a couple of things.. All conduits will fill with water buried in the ground. for reasons already stated about condensate. Not saying you should not glue them tho, as you dont want them to accidently pull apart when backfilled. All that I have ever pulled in after a period of time were full of water. And I have successfully sucked a "mouse"with a vacuum cleaner thru 400 foot conduits many times easily.. I think it could go much longer, but 400 foot is the longest I have pulled in. After the vacuum gives out, comes "jetline" CO2 power that shoots a ball thru longer conduits. I don't know the limit though. The voltage drops worry me also. you can calculate it yourself by looking up the resistance of the wire, and estimating the current load, and plugging it into the Ohms law formula. I too dont understand why the power company is not bringing the high voltage feeder to you. Sorry I could not directly answer you questions.

James K0UA

Gotta love those pipeline piggys!!!!!!:thumbsup::laughing:

 

[TRR]

My electric coop was reluctant to do "underground primary" because of the cost. But I insisted and they finally agreed. I had to provide a 4 foot deep trench from their takeoff point to wherever the lines come up above ground at the transformer pad. They provided the 4" conduit, wire, transformer and manpower to put it all together up to the transformer. I also had to have the wiring from the transformer, to the meter and main disconnect installed before they would do their part. I was only 200 amps and less than 500'. They would do any length I wanted but would require pull boxes every 500'.

Be sure that the conduit bells all face the same direction - especially the bends.