On 1/13/16 10:05 PM, Jim Brown wrote:
On Wed,1/13/2016 3:58 PM, Bruce Jungwirth wrote:
You said it. NEC is concerned with 60 Hz safety, not RF.
Lighting IS RF. It is not a DC event. It is not even a low frequency event.
Yes, NEC is concerned with safety. That includes lightning, electrical
shock, and fire. It is a BUILDING CODE, and it carries the force of LAW
when it is adopted by the local authority having jurisdiction over a
given building. Specifically, it is a set of MINIMUM requirements.
I think that is a key observation: it's a minimum. Nobody stops you from
doing more.
Yes, earth connections are important for lightning protection, but the
most critical element for all of those concerns is BONDING, not the
perfection of earth connections.
which gets back to the real thing.. it's all about making all the
voltages go up and down together, to reduce voltage differentials at a
particular place or box.
All those guidelines on rods and grids and buried wires are all about
reducing the voltage difference between two places on the ground surface.
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