How Should We Choose Surge Protectors In Floor Distribution Boxes - Taking National Standards As An Example

Article 3 of Section 5.4.3 of the national standard GB50343-2010 stipulates: At the junction of subsequent protection areas such as distribution boxes of distribution lines and distribution boxes of electronic equipment rooms, surge protectors of Class II or Class III tests can be installed as post-stage protection; special and important electronic information equipment power ports can be installed with surge protectors of Class II or Class III tests as fine protection.

The national standard states that you can choose a secondary surge protector or a tertiary surge protector; it can be determined according to the situation.

1. Basis for selection of surge protective device

The national standard stipulates that the flow rate of surge protectors selected for buildings with different protection levels can be different. Therefore, how to select a surge protector specifically requires first determining the lightning protection level of the building.

Section 4.3.1 of the national standard GB 50343 -2012: The electronic information system of a building can be classified according to Table 1-2 based on its importance, economy and value.

2. Selection of surge protection device for buildings with different protection levels

When determining the lightning protection level, the recommended values ​​of the impulse current and nominal discharge current parameters of the surge protector used for the power line should comply with the provisions of Table 5.4.3-3.