Galvanized bridge has become the most commonly used cable bridge in the market because of its wide application scope and low level, but many people will question whether galvanized bridge needs jumper. Can jumper wire improve the safety of galvanized bridge? Let's explain this problem to us.

The raw material of galvanized bridge is "electro-galvanizing", which is to put the steel plate into electroplating solution (containing zinc oxide) after chemical cleaning, and after electrification, zinc molecules are ionized and attached to the surface of the steel plate to form galvanized bridge.

Jumper principle:

Jumper is a line connected to the shell and other parts of electrical equipment, which leads to unsafe charge or leakage current caused by various reasons in time. Because the galvanized cable tray has certain conductivity due to the metal raw materials, in order to avoid potential safety hazards caused by current flowing on the galvanized cable tray due to leakage or other reasons when the cable is live, jumpers are usually installed on the tray (as shown in the following figure).

Jumper standard:

According to Article 4.8 of T/CECS 3 1-20 17 Technical Specification for Steel Cable Tray Engineering, the specifications of cable tray grounding wire are as follows:

4.8 grounding

4.8. 1 The steel cable tray system shall be reliably connected with the grounding device of the building. When the total length is greater than 30m, a grounding connection point is added every 20m~30m.

4.8.2 Expansion joint or continuous bending joint shall be connected with soft copper core wire or braided copper wire, and its cross-sectional area shall not be less than 16mm'.

4.8.3 When the steel cable tray enters and exits the building, it should be connected to the general equipotential grounding device nearby.