What is the function of equipotential of medical equipment?

Equipotential is to ensure that the indoor potential is constant. For example, when there is leakage, the indoor potential is still the same, which will not lead to potential difference. For example, if your hand touches the wall and you stand on the ground, if the potential of the place where your hand touches is different from that where your feet stand, a current will flow through your body, leading to an electric shock accident.