On Mon,7/25/2016 5:51 AM, jimlux wrote:
What you want is everything that is "near" each other connected with
good conductors that are similar in length (so the inductance is
similar, and the voltage rise from the pulse is similar).
If you have one piece of gear with a 10 foot cable to the lightning
impulse. And another piece of gear on the bench connected with a 100
foot cable to the lightning impulse, and then you interconnect the two
with a short jumper, you can see that there might be a problem.
The problem with this (and any) analysis of a lightning event is that it
is FAR more complicated than anything we can compute, simply because the
voltages and currents induced in any system (stuff wired together) will
be different in each conductor depending on WHERE the strike is, the
physical geometry of the conductors that make up that system, how energy
from the strike gets to the earth, etc.
Remember that in any given lightning event, voltages/currents are likely
to couple into our system (our home) via the power system, via the CATV
system, via the telephone system, via our antennas, and directly onto
all the wiring within our home. Voltages/currents will be very different
between those multiple systems by virtue of THEIR geometry, how they are
earthed and bonded, and THEIR proximity to the strike.
73, Jim K9YC
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