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A voltage that is caused by a current flowing in the ground or in a conducting floor and is equal to the potential difference between two points on the surface of the earth or of the floor that are separated by a distance of one pace.
At critical locations, such as the fence around your substation, hazardous step voltages can occur. It is, therefore, crucial to measure step voltage at locations in and around the substation in order to ensure safety for person or animals.

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For LV systems BS 7430 defines the elements for creating a proper earthing arrangement for a low voltage installation, including a main earthing terminal, protective conductors, earthing conductors and circuit protective conductors, and the use of earth electrodes to dissipate currents to the general mass of earth.
For substations, BS 7354 provides a design specification for proper earthing arrangements for a substation that can create a low impedance path for currents to earth, fault, and lighting currents to earth to protect people from the danger associated with step voltage.

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