We have a petrol pump monitoring system which is frequently struck by lightning. It comprises of a 2 wire feed from the control box of the petrol pump sitting a few meters away.
The cables running from the petrol pump to the controller box are placed in the ground inside a plastic sleeve - therefore exposed to the elements. We find that the controller box is frequently damaged by lightning surges.
Can you suggest a simple method to protect this 2 wire system. This pair of course is carrying 500mA of voltage within itself signalling protocol. We were considering to install fuses because they are very simple to replace if damaged BUT what would you suggest?