Answer Posted / d k sharma

there are two terms defined regarding floor of earthing system
1. touch potential(pot b/w hand and structurals (gnd) when a person is touching a grounded body like structurals in switchyard
2. step potential(pot diff b/w the feet of a person walking in the switchyard)

now to minimize these potentials we put pebbles in place of flat flooring.

the reptiles,moisture etc. are secondary reasons...

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