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Lightning protection for two wire loops

2 December 2014  |  Mining

A review of the internet suggests there a few devices specifically designed for protecting industrial 2 wire transmitters from lightning surge damage. The LPC10643 from Lightning Protection Corporation is a purpose made product with clipping voltage to protect 2 wire transmitters. 

It is connected across the device terminals with a third wire for a high integrity earth. For full protection, there would be a device at each end of the loop.  Of course, nothing can survive a direct strike, but in the vast majority of cases, the damage is done by voltages induced in wires close to the lightning event.