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Lightening - ground currents
Few realise that cables buried in the ground to outside observatories can result in severely
damaged equipment due to spikes induced by ground currents from lightening strikes as
much as a mile or so away. Computers, CCD Cameras, modems, motors for roll off roofs,
and many other devices can severely damaged, usually terminally.
One should use a "surge protector" at the observatory end, and ensure that a good ground
stake is attached to the third "earthing" conductor of their input to the surge protector.
I might add that indeed few electricians know anything about ground currents.
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