Where Is The Surge Protector Installed In The Distribution Box?

Surge protectors can timely discharge lightning surges that invade the power system, so that the potential of the entire line remains consistent, so some people call it an equipotential connector. However, after some users purchased surge protectors, they encountered a problem: Where should I install the surge protector in the distribution box? Today, the editor will tell you about the installation of surge protectors in distribution boxes.

Distribution boxes are usually equipped with air switches to control the power supply of power to loads. Usually, in addition to the incoming main circuit breaker, there will also be sub-circuits on subsequent load branches.

Therefore, according to the installation and power supply conditions, we can divide the two ends of the circuit breaker into the power supply side and the load side. As the name implies, if one side of the circuit breaker is connected to the power supply, it is the power supply side, and if it is connected to the load, it is the load side. For the main circuit breaker, neither side of it is directly connected to the load, so it is the power supply side, while the sub-circuit breaker is different, with a power supply side and a load side.

After understanding the power supply side and the load side, let's understand the installation of surge protectors in distribution boxes. GB50057 4.5.4 clearly stipulates that the surge protector should be installed on the power side of the switch, so under normal circumstances, we can choose to install it at the front or back end of the incoming main circuit breaker. However, the actual installation depends on the specific situation on site. For example, if there is no sub-circuit breaker installed in the distribution box or other special circumstances, the front end of the main circuit breaker is the power side and the back end is the load side.

In this case, the main circuit breaker becomes the only switch in the distribution box. In that case, the left side of the main circuit breaker is the power side and the right side is the load side, so the surge protector needs to be installed on the incoming line end on the left side of the main circuit breaker.

Have you ever encountered the above situation? In short, no matter what the situation is, you only need to understand how to distinguish between the power side and the load side, and follow the national standard for the installation position of the surge protector, and the problem of where the surge protector is installed in the distribution box can be solved.