What are the principles of connecting explosion-proof distribution boxes with galvanized pipes?

7 principles of connecting explosion-proof distribution box with galvanized pipe:

1 The requirements for laying explosion-proof pipes are higher than those for laying ordinary open pipes. Need to use thick-walled pipe (galvanized water pipe), each connection also has special requirements.

2 Pipes and pipes need to be connected with junction boxes and switches using threaded connections, and explosion-proof junction boxes and explosion-proof switches need to be used.
3 Steel pipe needs to have sufficient strength and protection, and its wall thickness is not less than 2.5.

4 When pipe clamps are used to connect steel pipes, lock nuts should be installed on the joints in order to prevent the threads from loosening and to improve the explosion-proof performance. Since the joints are not tangled or painted, there is no need to solder the jumper wires. When it is difficult to connect electrical pipe joints, explosion-proof joints should be used.
5 steel pipe from the explosion-proof place to the open fire area or distribution room, should be installed on both sides of the partition wall isolation sealing box, and isolation sealing, so that the explosive mixture can not enter the open fire area or distribution room.
6 The installation position of explosion-proof isolation sealing box is generally not more than 300mm from the partition wall. within this distance, the steel pipe shall not have joints to ensure its sealing performance. When the wiring pipe is introduced into other places through the floor or floor board, the longitudinal isolation sealing box should be set above the floor or floor board. In order to ensure good insulation of wires or rubber-coated cables, install drainage type isolation sealing box in the place where there is often condensation, so as to prevent the pipe from exploding due to pressure superposition when an explosion occurs.
7 explosion-proof connecting tube is used in explosion-proof places or steel pipe wiring has a large curvature of the place to connect the electrical feeder device of the explosion-proof wiring device. Both ends of the metric column pipe threaded fittings, the two fittings are welded to the galvanized metal hose with solder.

When connecting explosion-proof distribution boxes to galvanized pipes, special attention needs to be paid to the following points:

Grounding issues: due to the galvanized pipe production process will significantly affect the conductivity of the galvanized layer, so in the connection between the explosion-proof distribution box and galvanized pipe, the need for jumper cables. Specific operation is set up in the explosion-proof power distribution box special grounding line, by connecting to the ground to ensure grounding reliability, thereby improving explosion-proof safety performance.

Connection: Explosion-proof distribution box and galvanized pipe should be connected with threaded connection and use explosion-proof junction box and explosion-proof switch. The steel pipe needs to have sufficient strength and protection, and its wall thickness is not less than 2.5mm.

Sealing issues: When an explosion-proof feedthrough box is connected to galvanized steel pipe or flexible pipe, the entire system may not be explosion-proof because the threads do not have a sealing function. Therefore, special attention needs to be paid to sealing issues when connecting to ensure the safety of the system in explosion-proof areas.

Material selection: explosion-proof distribution box box should be made of stainless steel (such as Baosteel 304 or more), the color of stainless steel color, box thickness of not less than 4.0mm.

Specific procedures for jumper cables:

In jumper cables, first select the appropriate grounding wire and grounding method, and then connect the jumper cables inside the explosion-proof distribution box, connect the grounding wire to the grounding screw of the explosion-proof distribution box, and then connect the other end of the grounding wire to the bus bar or other equipment. Connection should ensure that the length of the grounding wire is appropriate, the grounding interface is tight, otherwise it will affect the grounding effect of the jumper wire, thus affecting the explosion-proof safety performance.

Through the above measures, the reliability and safety of the connection between explosion-proof distribution box and galvanized pipe can be effectively ensured.