Explosive dust environments are divided into Zone 20, Zone 21, and Zone 22. Then all the electrical equipment in those three zones must be completely explosion-proof...
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Explosive dust environments are divided into Zone 20, Zone 21, and Zone 22. Do all the electrical equipment in those three zones have to be explosion-proof?
Yes, it’s just that the explosion-proof design varies; for Zone 0, intrinsically safe types are used
That’s right; as long as it is within the area designated for explosion-proof use, explosion protection is required. Because such classifications are simply used to determine the explosion protection rating, that is, the different levels for using explosion-proof electrical equipment
Yes, electrical equipment must be explosion-proof within the explosion-proof area
All electrical equipment must be explosion-proof
Be sure to use dust-proof electrical equipment.
Yes, it’s just that the explosion protection ratings are different
Code for Design of Electrical Installations in Explosive Atmospheres GB50058-2014
Yes, explosion-proof equipment must be installed and used in all areas classified as explosive zones. It’s just that the protection levels of explosion-proof equipment vary depending on the explosion-proof zone; for example, the protection level in Zone 20 is Ga, that in Zone 21 is Gb, and that in Zone 22 is Gc. Feel free to continue the discussion
Yes, and the explosion-proof rating of the explosion-proof electrical equipment used in different areas also varies; for example, in Zone 20, Da-rated equipment is required, in Zone 21, both Da and Db rated equipment can be used, while in Zone 22, Da, Db, and Dc rated equipment are acceptable