On 9/12/2011 1:18 PM, Stuart Rohre wrote:
With so many chassis these days connected to AC third wire ground, it is
all the more necessary to isolate the feeders from those radios.
NO! Two huge misconceptions here. First, BY LAW, the chassis of
anything connected to the AC line MUST be bonded to the green wire.
This has been LAW for MANY years, it is not new. The sole exception is
for equipment whose exposed metal that is double insulated from the
power line, in which case it can have a two-wire plug. No ham gear falls
into this catagory.
Second, ALL grounds in any premises MUST be bonded together for
lightning safety, AND BY LAW. That includes the power system, telco
arrestor, CATV grounds, cold water (if conductive), building steel, and
ALL antennas, ham or otherwise.
Read the NEC. Study IEEE materials and Standards on grounding. This is
what they say, and the engineers who wrote them are a lot smarter than
anyone on this list.
73, Jim Brown K9YC
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