On Fri, 27 Jul 2007 11:04:26 -0400, Alan NV8A wrote:
>My understanding is that the NEC sets a minimum standard.
The NEC is a guideline document writen by a collection of very
smart guys (and revised every three years). By itself, it carries
no authority at all. It carries the force of law when it is
adopted by an "authority having jurisdiction" -- that is, your
local building department, which is a part of your local
government.
Most local building departments adopt it without modification. A
few cities have written their own -- Los Angeles and Chicago come
to mind. The Chicago code is unrelated to NEC, and probably
predates it. Last I looked, it was pretty archaic, and some
elements of it were clearly designed to generate work for union
electricians. :)
The grounding requirements of NEC are not terribly demanding, so
the stuff I'm seeing quoted here re: tower grounding seems a bit
suspect. I'd like to see citations of the numbered paragraphs that
call for the large conductors being discussed before I take it as
gospel.
The NEC is a pretty good document. I don't know of anything in it
that requires anything that is bad for radio, audio, or video. I
know of a lot of dumb things that are done by people designing
radio, audio, and video equipment that causes hum and buzz
problems that they then BLAME on power system grounding. But it is
the designers of that equipment that are wrong, NOT NEC.
73,
Jim Brown K9YC
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