Building Standoff from Overhead Electrical Lines

[wcl77]

What is the required standoff distance (horizontal and vertical) between a new occupied warehouse/shop building and an overhead electrical transmission line? The two lines I have running overhead are 138kVa and 69kVa. I am working in a tight spot and need to decide if we should reroute the transmission lines.

 

[JedClampett]

Someone might know that on this board, but you might be better off posting it in an electrical forum.

 

[bridgebuster]

Can you call the utility company? Usually they have requirements concerning clearances;at in NYC they do.

 

[haynewp]

It may be a local requirement. Call your building department.

 

[wcl77]

The building is located within the boundaries of an industrial plant. I have some guidance from plant managers but it is all off the cuff and I am really looking for something written down (perhaps in a code) so that I can have confidence with respect to life safety issues. I am sure the building departments and utility companies use something as a basis for their standoff definition. It is this basis I am looking for.

 

[DMcGrath]

From a construction standpoint, 11 feet is an absolute minimum distance to maintain between any grounded structure (crane, backhoe, etc.) and the high voltage conductor. Note that the conductors will sag more during periods of hot weather and high demand. I have been told by the power guys that the sag can be several feet. The utility that owns the lines should have a diagram showing the minimum and maximum sag in the line.

 

[SlideRuleEra]

Here are some Australian guidelines for permanent structures:

http://www.energysafety.sa.gov.au/images/pdfs/DeclarationGuide.pdf

and construction guidelines from the US:

http://www.cdc.gov/elcosh/docs/d0400/d000482/d000482.html

http://www.SlideRuleEra.net

 

[boo1]

Ch 4

http://www.usda.gov/rus/electric/pubs/1724e-200.pdf

http://www.usda.gov/rus/electric/pubs/1728f-810.pdf