Overhead lines 2

[jobrelated]

What are the design standards (load, embedment, guys etc.) of wooden pole to carry secondary overhead three 500 MCM power conductors?

 

[l3city]

This might also depends on voltage size. Usually, Utility Co. has its own standards.

 

[jghrist]

In the USA, it's the National Electrical Safety Code. See

http://standards.ieee.org/nesc/index.html

 

[wareagle]

Since you have chosen the conductor you need to determine
1. Conductor tension
2. Conductor sag and ground clearance. Ground clearance depends on what you are crossing. Example if the area requires 20 ft clearance you will need a pole of sufficient height to maintain the 20 ft plus the sag.
3. Load Span. The load span is equal to the distance between low points of sag between adjacent poles. This length will allow you to calculate the vertical load on the pole due to conductor weight.
4. Horizontal loading. This is due to wind force on the conductors, pole, other equipment, dead end conductors and conductor change in direction. Your location will determine if ice load on the conductors should be included.
Once you have determine the loads acting on the pole you can determine the required pole diameter and thus the class of the pole.

 

[stevenal]

http://www.usda.gov/rus/electric/bulletins.htm

 

[advidana]

How to do it is explained in "the lineman's and cableman's handbook". Your local power company has the spec for for doing it if they will give you a copy. Tip: when I was a rockie I did not know that an insulator is required on the guy line from the pole to the ground for galvanic protection, it found and corrected in the review checking by the engineer in charge at the time. Don't make the same mistake I did.

 

[tommom]

Find "Electrical Distribution Engineering" by Pansini. It has a complete, followable method for designing overhead and underground distribution. Pennwell books publishes this.