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Soil resistivity is a measurement of the resistance or electric current that the soil conducts.The design of a system based on passing current across the surface of the earth is a key component.

As we discussed in our earlier blog how the working principle of SPD is different from Fuse. Read Solutions to avoid Surges in Industrial and Commercial power systems to understand the basic difference between SPD & Fuse.

It is well-known fact that lightning surges are more destructive than switching surges. Research reveals that switching surges cause far more faults and early failures of sensitive electronic and electrical equipment than lightning surges because there are many sources of switching surges.