2/0 copper span?

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i'm still trying to come up with a correction notice for this unpermitted barn that has recently been annexed into our city.
in addition to other violations, this is the last thing. they ran (overhead) to the 100A sub. at least they used insulated supports on the poles! i know it is not a "service" conductor, but is there any code that allows (or disallows) this?

really 0'0" ???? the service utility does it all the time without a "messenger" wire...
 
mayjong said:
i'm still trying to come up with a correction notice for this unpermitted barn that has recently been annexed into our city.
in addition to other violations, this is the last thing. they ran (overhead) to the 100A sub. at least they used insulated supports on the poles! i know it is not a "service" conductor, but is there any code that allows (or disallows) this?

really 0'0" ????
the service utility does it all the time without a "messenger" wire
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...
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then what's this about?
 
thnaks.. i found the 225.6 reference. for some reason, i thought there was a table indicating max span based on conductor size:-?
nice tip on the grounded conductor being used by the utility , i wondered how they did that. i don't deal with their side of the panel...

thanks!
 
funny, just got off the phone with the contractor.
rather than do the work, they are going to pull the sub and overhead conductors (spanned more than 15') back to the main and abandon it...

easy come, easy go :)
 
btw- how much do you want to lose?
480sparky said:
I would say 0'-0". It's not rated for installation like that.

If, however, you install a messenger............
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do i need to post the definition of "messenger wire" ?
i have the 05 nec , where is ACSR allowed? hmmmm.
well, i can show you where i can span 15' (per CODE) without a messenger wire, and also when one is required (per CODE)..
do you need to knwo where to send the $$$$???
 
mayjong said:
btw- how much do you want to lose?


do i need to post the definition of "messenger wire" ?
i have the 05 nec , where is ACSR allowed? hmmmm.
well, i can show you where i can span 15' (per CODE) without a messenger wire, and also when one is required (per CODE)..
do you need to knwo where to send the $$$$???
Click to expand...

Quote what you want. POCOs don't play by the same rules we do.
 
mayjong said:
what is the max unsupported span (no guy wire) for 2/0 copper??
argggg, i can't find anything!!!!
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If it is the utility: a lot longer than you would ever be worried about. The sag will manage the tension. We will pull 2/0 hard-drawn copper in at a maximum design tension of 2,963 lbs. For a 2,000 span, that is a 69 ft sag. For a 200 ft span, that is a 0.7 ft sag.

For a 200 ft span, if you wanted the tension to be 100 lbs, you would have a sag of 20.5 ft.

You did not specify, but let's assume a 100 ft drop with an allowable tension of 200 lbs/conductor and we would get a sag of 2.6 ft.

You said more than 15' so looking at 3 wires at 20' with combined pull of 150lbs would be a 0.4 ft sag.

All of this is for bare 2/0 HD CU with a weight of 0.411 lbs/ft.

For your specific app, you mileage may vary but you get the idea.

mcclary's electrical said:
Utility's strenght member is in the grounded conductor,,,cut it with your strippers it will nick the blades.
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Not necessarily.
480sparky said:
Wanna bet? What do you think ACSR stands for?
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Has nothing to do with copper service.
 
mayjong said:
thnaks.. i found the 225.6 reference. for some reason, i thought there was a table indicating max span based on conductor size:-?
nice tip on the grounded conductor being used by the utility , i wondered how they did that. i don't deal with their side of the panel...

thanks!
Click to expand...
The grounded conductor is not necessarily the support.

As for the other: Don't know of a service drop length limit but there is for service entrance (2.5 ft for cable, 15ft for open wiring). 230.51(C) may be the table you were thinking about but it is not by conductor size.

For outside branches & feeders, per 225.6(A)(1) for non-festoon lighting:
For spans up to 50 ft, it must be minimum #10 CU or #8 AL, for over 50 ft. For non-messenger supported wire over 50 ft, it must be minimum #8 CU or #6 AL.

So it looks like for 2/0, there is no limit specified.
 
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