The types of anti-corrosion layer on the surface of cable ladder mainly include hot dipping galvanized, galvanized nickel, cold galvanizing, powder non-electrostatic spraying and so on.
The data of the cable ladder manufacturer shows that the hot dipping galvanized process life is not less than 40 years, which is suitable for outdoor heavy corrosion environment and high cost; Galvanized nickel process life is not less than 30 years.
Also suitable for outdoor heavy corrosion environment.
High cost; Cold galvanizing process life is not less than 12 years, Qinkai cable bridge is suitable for outdoor light corrosion environment.
The cost is general, and the process life of powder electrostatic spraying is not less than 12 years. Suitable for indoor room temperature dry environment, the price is general.
The designer should reasonably select the type of surface anti-corrosion layer of the cable ladder according to the engineering environmental conditions, and clearly express it in the design document.
Always use the method of crossing the ground wire
This kind of cable ladder protects the ground, and the grounding transition connection between each section of the bridge adopts the special transition connection provided by the manufacturer.
The contact surface of the end of the cable ladder in contact with the transition connector should be well contacted to meet the requirements of the joint resistance, and the manufacturer should be clearly explained when ordering.
After a sound electrical path is formed between the cable ladder body, the whole cable tray should be protected and grounded.
When the cable ladder body forms the E line, the positive value of the joint shall not be greater than 3.3x10-4 ohms in accordance with the annex of document 2. Braid copper junction or multiple strands of plastic copper loose wire shall be used in the settlement joint, expansion front and other places, and double connections shall be made.
The multiple strands of copper core wire shall be connected after adding terminal blocks.
When there is a connection between copper and aluminum, the copper in the contact area should be tin.
Protective measures should be added to the protective grounding connection of any cable ladder.
Galvanized parts should be used to connect the fasteners.
Neutral Vaseline or conductive paste should be used to squeeze and fill the contact place of the cable ladder surface.
Post time: Aug-11-2023