The equipotential of the bathroom belongs to a pivot point in the family building, its role is to ensure that the bathroom in some way to suffer from lightning, electrical equipment in the bathroom due to other reasons and caused by leakage, the human body.
Equipotential refers to the two charged bodies in the electric field, there is no voltage between them, it is called equipotential, also known as equipotential, equipotential connection is the role of what? We all know that when thunder, lightning will be along the building and the building inside the reinforced concrete, has been extended to the whole building above, this time if we are not careful to touch the metal windows and metal water pipes, metal gas pipes, etc., then we will be electrocuted, in order to prevent this kind of electrocution accidents, we have to be these exposed to build all the metal items with equipotential coupling line Connected together, and then uniformly connect them to the earth will leakage of electricity into the earth, to prevent electrocution, then the role of equipotential connection is to prevent. What is the difference between equipotential connection and ground connection.
Equipotential connection system is to make the electrical equipment exposed conductive part and the device outside the conductive part of the potential is basically equal to the electrical connection, in recent years, the international vigorously promote a kind of electrical safety measures. In the high-voltage system, due to the flow of current into the earth is very large, in order to ensure personal safety, as far as possible to reduce the contact voltage, are generally used in artificial equipotential network; and in the low-voltage system, the current into the ground is relatively small, but also in the industrial and civil buildings in the electrical equipment is more, a variety of metal pipes, criss-crossing, metal components abound, in order to ensure the safety of people and equipment, will be reliable from the electrical In order to ensure the safety of people and equipment, will be electrically connected to form an equipotential space, in accordance with national standards usually referred to as equipotential coupling.
What is a general equipotential connection? Total equipotential connection is a basic measure of ground fault protection, it will be the building into the power distribution box PE (protective earth or protective zero line) bus, ground trunk, water and sewage pipes, gas pipes, heating pipes, air-conditioning ducts, cable channels and various metal components, such as convergence into the power distribution box next to the grounding bus (total grounding terminal) and connected to each other, you can in the occurrence of a ground fault significant Reduce the expected contact voltage of the exposed conductive part of the electrical device, reduce the risk of unreliable protective appliance action, eliminate or reduce the impact of dangerous voltage from outside the building into the exposed conductive part of the electrical device.
The above piping introduced from outdoors should be connected as close to the population as possible in the building. It should be noted that gas and heating pipes should be listed in the general equipotential connection, but are not allowed to be used as grounding electrodes. Therefore, the gas pipe should be inserted into an insulated section and connected across an overvoltage protector after entering the house, while the outdoor underground heating pipe can be insulated without additional measures. The total equipotential connection is generally set up with a special terminal board. Total equipotential connection line cross-section should not be less than half of the maximum PE wire cross-section of the electrical equipment, but if the copper conductor does not have to be greater than 25mm?; If it is the other materials of the wire, it should be the same cross-section area with the corresponding copper conductor.
Again, what is local equipotential bonding? Local equipotential bonding refers to the above conductive part of the local range and then make a connection, such as local equipotential bonding within the range of no PE wire, do not have to deliberately lead from outside the range. Two exposed conductive part of the connection between the conductive part or exposed conductive part of the conductive part of the device and the conductive part of the connection between the auxiliary equipotential coupling, generally referred to as the local equipotential coupling.
It can be used to reduce the fault contact voltage to below the contact voltage limit when the conditions for ground fault protection of the electrical device or a part of the electrical device cannot be met. When the power network impedance is too large, the automatic cut-off current time is too long, can not meet the requirements of electric shock prevention; and such as bathrooms, swimming pools, medical operating rooms and other places to prevent electric shock have special requirements, can be set in the local range of equipotential interconnection.
Local equipotential connection can lead from the special terminal board, can also lead from the distribution panel within the PE trunk line. It is best to form a ring connection line from the two terminals, the above lines and components need to be connected to the ring grounding line, but also the exposed conductive part of the electrical equipment and the neighboring plumbing pipes, building metal components directly connected to form a local equipotential.