Equipotential and grounding effects are different.
One, the role of different:
1, equipotential: the building of each electrical device and other devices exposed metal and conductive part of the artificial or natural grounding body with a conductor connected to reduce the potential difference.
2, grounding: electrical equipment and other production equipment may produce leakage current, electrostatic charge and lightning current into the ground, so as to avoid personal electric shock and possible fire, explosion and other accidents.
Two, the device is different:
1, equipotential: equipotential device for equipotential box, the ground into the ground, in the person electrocuted can quickly fuse and disconnect the power supply.
2, grounding device: by the grounding body and grounding wire. Including direct contact with the soil metal conductor and electrical equipment to be connected to the grounding point and grounding body connected to the metal conductor. Grounding body can be divided into two categories of natural and artificial grounding body.
Three, different types:
1, equipotential including total equipotential connection, local equipotential connection and auxiliary equipotential connection.
(1) the total equipotential connection: the role of the whole building, to a certain extent, can reduce the building indirect contact electric shock contact voltage and the potential difference between different metal parts, and eliminate the building from outside the introduction of electrical wiring and all kinds of metal piping hazardous fault voltage.
(2) auxiliary equipotential connection: in the conductive part of the direct connection with wires, so that their potentials are equal or similar.
(3) local equipotential connection: the following parts can be connected to each other through the local equipotential connection terminal board.
2, grounding can be divided into work grounding, lightning grounding and protective grounding.
(1) the work of grounding in the system when a ground fault occurs, there will be thousands of amperes of work current flowing through the grounding electrode, however, the current will be relay protection device in 0.05 ~ 0.1s cut off.
(2) Lightning protection grounding will only have current flow under the effect of lightning impact, the amplitude of lightning current flowing through the lightning protection grounding electrode can be tens to hundreds of kiloamperes, but the duration is very short.
(3) protective grounding is to prevent the equipment due to insulation damage charged and endangered personal safety, such as the metal casing of power equipment, reinforced concrete poles and metal towers.
Baidu Encyclopedia - Equipotential
Baidu Encyclopedia - Grounding