Overhead power lines vs Cable Trays

[cheglar]

There are multiple standards that limit mechanically operated equipment from operating within the 10 foot minimum clear distance between the overhead lines.

Where is the guidance in the NEC that exempts overhead cable trays from the 10' minimum distance requirements when containing lines of the same voltage? I suspect it's because the trays are treated similar to conduit but I'm just guessing. Thanks for your input.

 

[tom baker]

The 10 ft working minimum distance is not an NEC requirement, that’s 70E, OSHA or POCO.

 

[don_resqcapt19]

Overhead lines on poles are not insulated most of the time, while the cables and conductors in a cable tray are insulated. You can safely touch the cables and conductors in the tray barehanded and while you are grounded...you can't do that with the typical overhead conductor.

 

[cabledawg]

It sounds like a PUC(public utility co.) issue. Yes there is a certain distance between powerlines and other objects. The distance is designated by what Voltage is Overhead. I have the picture in my head but dont know what to refer to. If you see a telephone pole, you will have power up top, then all other Puc's below that by like 4+ feet. Hope this helps a lil bit.

 

[LarryFine]

The 10 ft working minimum distance is not an NEC requirement, that’s 70E, OSHA or POCO.

Why have I always thought that 70E was the NEC?

 

[don_resqcapt19]

Why have I always thought that 70E was the NEC?

NFPA 70 is the NEC. NFPA 70E is "Standard for Electrical Safety in the Workplace"