Can non-explosion-proof electrical devices placed in explosion-proof enclosures be used in explosion-proof areas?
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One workshop requires EXD II BT4; the electrical equipment is not explosion-proof. We want to put it in an explosion-proof enclosure before using it. Are there any regulations that support this approach?
When non-explosion-proof electrical devices are placed in explosion-proof enclosures, explosion-proof measures such as gland fittings are required.
Sure, think about whether there are explosion-proof PLCs? The PLC can only be placed in an explosion-proof box
It’s completely possible, but I’m not sure what electrical device it is Be sure to install it in an explosion-proof box – what about heat dissipation when your electrical appliance generates heat? This problem must be solved!
Sure, it’s fine as long as the explosion-proof box and the wiring for connection are properly installed； For the renovation here, I plan to do it this way: install the solenoid valves inside explosion-proof boxes.
Many on-site PLCs do this to save costs
Of course~~~ An explosion-proof box is used to house non-explosion-proof electrical equipment. At the outlet of an explosion-proof junction box, a flexible hose, a flexible conduit, or a gland must be used. Most explosion-proof boxes are of the flameproof type; the power must be turned off before opening the box, otherwise it is not allowed to do so.
The poster’s question is: I purchased a separate flame-proof box on my own, in which non-flame-proof equipment such as relays and electric heaters are placed. The flameproof enclosure can be certified as Exd separately; such a certification specifies requirements for the internal \"non-flameproof\" equipment, as well as limits on power and temperature rise, etc. Otherwise, the entire enclosure does not meet the Exd requirements.
In principle, it shouldn’t be possible, as explosion-proof designs cannot achieve complete isolation of flammable gases. Explosion-proof instruments generally do not come equipped with safety barriers; if only an explosion-proof box is used, flammable gases can reach a certain concentration inside that box, and an explosion will occur when exposed to sparks. This approach only provides explosion protection within the box itself, and it does not protect the instruments in the control room
Oh, it seems pretty powerful... 0sod
An explosion is caused by two factors: an explosive medium and an open flame. The purpose of an explosion-proof box is to prevent the entry of the explosive medium at the source; even if sparks appear, no explosion will occur. The best solution is to use explosion-proof boxes in combination with intrinsically safe instruments, which eliminates both of these factors, ensuring that no explosion will ever happen