Equipotential is equal potential. In a charged line if you select two test points, measured no voltage between them that is, no potential difference, then we recognize that the two test points are equipotential, there is no resistance between them.
The role of equipotential:
1, to a certain extent, to reduce the building indirect contact with the electric shock of the contact voltage and the potential difference between different metal parts. Equipotential is the developer for the bathroom to stay safe anti-electrocution measures, lightning, anti-static, anti-electrocution. However, it is necessary to install later to start.
2, eliminating the hazard of dangerous fault voltage introduced from outside the building via electrical lines and various metal pipes. Equipotential can be all outside the home water, gas and other piping places, with wires connected together, and then centralized to the equipotential bonding terminal box, a little more commonly known, in the bathroom equipotential is used for bathing equipment and related sockets grounded. The existence of this equipotential bonding terminal box can greatly improve the protection of the person, to prevent electric shock.
3, to reduce the danger of unreliable action of the protection of electrical appliances and help avoid interference caused by external electromagnetic fields, to improve the electromagnetic compatibility of the device. Homeowners bathing water, if you encounter unexpected conditions, resulting in the current through the outlet, the wire will be the first time the current led to the terminal for decomposition, play a role similar to that of the grounding wire, which can be very good to avoid electrocution accidents, for home safety life to provide a strong protection.