I'm working on an application where contact closures will be sensed by a
PIC inside a building, but the contacts are outside (perhaps tens of
meters away). What sort of protection for the inputs is suggested? What
sort of protection is required by regulatory standards for equipment
connecting to outside wiring? The outside wiring would likely be buried,
but lightning could still induce currents into buried cables. Opto
couplers are one way to get the isolation, but then you have to power the
LEDs with an isolated supply. Ideas?

Thanks!

Harold



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