Something I should've mentioned is that the connections are all
essentially in series. For example. If you have a wire going to a
ground rod and you connect several devices to it, they are all
meeting at the top of a "resistor". If a device attaches part way
down a wire or you have a wire running along the back of a bench and
the various pieces of equipment attach somewhere along he main ground
wire, this is like a tapped resistor. Each piece of equipment is
connected a some point along the resistor.
Ground plates are usually insulated from walls, inside or out because
the wall can become part of the path. Lightning is tricky stuff and
the only rule it follows is that of finding the quickest and most
direct path to ground. However, that doesn't mean that it won't take
many paths. Make it convenient for it to follow the least damaging path.
Again,
Burt, K6OQK
At 12:44 PM 10/4/2009, [email protected] wrote
One of the ways that I've always explained this is to draw a
schematic, actually more of a pictorial of the ground system and each
piece of equipment in the overall system as a block. In place of the
wires to ground, I draw a resistor symbol, including the ground and
ground lead itself. In fact, each chassis or cabinet is also one of
the resistors. By looking at it this way you can see that the ground
system path is nothing more than a low resistance voltage divider,
actually a current divider between a strike and the good earth.
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
[email protected]
K6OQK
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