Flameproof instruments and explosion-proof enclosures with ordinary instruments
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The explosion protection rating at the site is BT4, and there is a CT4 device. Is it in compliance with the standards to use explosion-proof instruments, or ordinary instruments combined with explosion-proof enclosures?
Yes, as long as the explosion-proof instrument box meets the explosion-proof requirements
Anything that meets the explosion-proof requirements is acceptable
Could you provide the regulatory basis? We are also looking for information on this topic
Strictly speaking according to GB3836, it is not allowed! No overall explosion-proof certification!
In fact, many manufacturers use it this way. Existence is rational. Based on an analysis of the explosion-proof evidence collection testing process, this method is also feasible. Attention should be paid to the outlet of the explosion-proof box; moving parts such as doors and windows must not be damaged during use, otherwise, in the event that the instruments inside explode, the energy from that explosion could escape, leading to safety accidents.
Note that all fittings for the cable outlets also require explosion-proof seals. Such as explosion-proof metal hoses, pipe fittings, explosion-proof sealing boxes, etc.