Touch potential is a problem similar to step potential – see Figure 4. It involves a fault current flow in
the earth establishing a potential difference between the earth contact point and some nearby conductive
structure or hardware.
Figure below
Protection for step and touch potential is the use of switch operating platforms and ground grids. The
worker must remain upon a local conductive mat as the highest voltage gradient has been moved to the
mat's edges. Sub stations on Site have a ground grid located under the rocks, but if an individual is
located outside this area and while standing on the earth, touches a ground or a grounded object, a
difference in potential may exist during a ground fault.
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