500’ Span 2/0 copper

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Ww21

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Have a question for the group. I have a job coming up that crosses wetlands. Some of the spans are 500’ long 4 wire 2/0 copper. Can I get away with using single poles or will I need to go with H structures? Nothing else will be on the poles. Thanks
 
Ww21 said:
Have a question for the group. I have a job coming up that crosses wetlands. Some of the spans are 500’ long 4 wire 2/0 copper. Can I get away with using single poles or will I need to go with H structures? Nothing else will be on the poles. Thanks
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I'm not sure anyone here knows a lot on aerial conductor design. Figuring out the span, tension, allowable tension, and sag is pretty easy utilizing readily available charts and calculators online, but I would be concerned about spacing to account for swaying during weather events. Perhaps you can find some charts out there that cover this. I would first see if this can be done with the span and conductor you are wanting.....might need something like ASCR or 6201 alloy..... Wait, copper??? Wouldn't AL be a better choice for this?
 
are you thinking messenger supported or individual conductors? Do you need 3+G or 4+G? If the former, have you considered using 4/0 ACSR Quad? ITs pretty east to calc sag an tension, see pages 29-31 of this document:


Just for example puling some numbers out of the air: 4/0 Zuzara can span 500 feet with a 15 foot sag and would have a tension of 1670 pounds, which is 20% of the breaking strength, which is under the 25% allowable for the second condition in that document (the other condition is under adverse loading due to weather which should not exceed 50% of breaking strength - did not run any numbers for that). Using a 6210 messenger Lepas is slightly better with a tension of 1500 lbs and a 17.5% loading.
 
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