Originally Posted by Surf City
Getting ready to bring home our new purchase
to North Carolina
and was wondering - what is to close when it comes to mast
height and high voltage power lines? Our mast
is at 70' and power lines are stated to be 78'. Have not seen anything in the books
. Just want to make it home safe.
" —If the power lines are not de-energized, operate cranes in the area
ONLY if a safe minimum clearance
is maintained as follows:
At least 10 feet for lines rated 50 kilovolts or below
At least 10 feet plus 0.4 inch for each kilovolt above 50
kilovolts; or maintain twice the length of the line
insulator (but never less than 10 feet)"
So, you need to know the voltage. As a rule
if it is over 50KV, the insulators are going to be over 2' long and it is going to be obvious.
Additionally, the chart should give an "authorized clearance." I would hope that NOAA or the ACE took these factors into account. I certainly would not under-cut their figure.
That said, rainy weather or thunderstorms in the area can change the math too, as they can contribute charge.