Explosion-proof area cable wiring
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Seen in chemical plants: electrical explosion-proof design – explosion-proof motors, explosion-proof flexible connectors, cables enclosed in galvanized pipes； Then the cable is in the tray. I’m not quite sure why the cables in the cable tray don’t use galvanized pipes
If the cables in the cable tray are not enclosed in galvanized pipes, won’t they still come into contact with flammable and explosive gases?
It’s not the cable coming into contact with flammable and explosive gases that creates a risk, but rather preventing problems within the cable itself, such as sparks, from causing hazards.
Dear poster, I still don’t quite understand: the cables coming out of the cable tray are enclosed in galvanized pipes, while the cables inside the cable tray do not have such pipes. Could you explain it again? Thank you. Is it a problem with the cables inside the cable tray?
What problems can occur with cables in cable trays? You don’t understand the concept of explosion protection. The three conditions required for an explosion are a combustible material, an oxidizing agent that facilitates combustion, and a source of ignition. The electrical explosion protection method used is flame isolation, which is applied in areas where electric sparks may occur
Since each workshop is explosion-proof, if flammable gases enter the cable trays, and an accident occurs with the cables in those trays, wouldn’t that be dangerous?
This post was last edited by liht319 on 2017-6-22 at 11:19. According to the regulations, in explosive environments, flame-retardant cables should be used when cables are installed on trays. The purpose of laying cables in conduits is not to seal off air, but to prevent the spread of fire. Using flame-retardant cables is also to prevent the spread of fires. Therefore, in explosive environments, the requirements for cable installation are aimed at preventing the spread of fire, rather than preventing explosions.
Galvanized pipes are used to protect cables, and cable trays also serve to protect cables; it is the explosion-proof connectors that actually provide explosion protection