How To Choose A Surge Protector For A Floor Distribution Box - Easily Solve The Problem Of Electrical Appliance Damage

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 protection device of Class II or Class III tests as fine protection. Details on how to choose a surge protector for a floor distribution box are as follows:

How to choose a surge protective device for a floor distribution box, 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 protectors

The national standard stipulates that buildings with different protection levels can have different flow rates of surge protectors, so how to select a surge protector specifically first requires determining the lightning protection level of the building.

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

Lightning protection level

Building electronic information system

Grade A

1. Electronic information systems of national computing centers, national communication hubs, special and first-class financial facilities, large and medium-sized airports, national and provincial radio and television centers, hub ports, railway hubs, provincial cities, water, electricity, gas, heat and other important urban public facilities;

2. First-level security units, such as national cultural relics, archives of closed-circuit television monitoring and alarm systems;

3. Third-level hospital electronic medical equipment

Grade B

1. Electronic information systems of medium-sized computing centers, second-level financial facilities, medium-sized communication hubs, mobile communication base stations, large stadiums (halls), small airports, large ports, and large railway stations;

2. Second-level security units, such as provincial cultural relics, archives of closed-circuit television monitoring and alarm systems;

3. Radar station, microwave station electronic information systems, highway monitoring and toll collection systems;

4. Second-level hospital electronic medical equipment;

5. Five-star and higher star hotel electronic information systems

Grade C

1. 1. Electronic information systems of third-level financial facilities and small communication hubs;

2. Large and medium-sized cable TV systems;

3. Electronic information systems of hotels of four stars and below

Class D

General-purpose electronic information equipment that needs protection other than the above-mentioned Class A, B, and C

2. Selection of surge protectors 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 for the power line should comply with the provisions of Table 5.4.3-3.

How to choose a surge protector for the floor distribution box As shown in the table above, if your project is a first-level protection building, you can choose a second-level surge protector with In of more than 40kA. If you want to choose a third-level surge protector, you need to choose a surge protector with Uoc≥10kA.