Explosion protection rating of the junction box
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I’m passing by all the experts here, and I have a question: for wiring terminal boxes, if the brand and the number of terminals are exactly the same, which one is cheaper, the intrinsically safe version or the increased safety version?
This post was last edited by qugd on 2024-4-1 09:51. Wiring boxes generally do not have an intrinsically safe rating specified for them, but in intrinsically safe circuits, wiring boxes that are certified as intrinsically safe must be used. Since intrinsically safe versions have a higher level of safety, for junction boxes of the same manufacturer and with the same wiring specifications, intrinsically safe versions should be more expensive than those that are only extra-safe. In sites that do not require intrinsically safe design, using an increased safety type of junction box is sufficient.
Thank you for the answer, but I still want to know which one is cheaper and which one is more expensive.
To start with the results, generally speaking, the prices of junction boxes follow this order: flameproof > increased safety > intrinsically safe. In fact, inverter wiring boxes are kind of special – theoretically, they constitute intrinsically safe circuits. Even if I send you a plastic wiring box, it can still be considered an intrinsically safe wiring box. When manufacturers produce such wiring boxes, even those made of stainless steel are designed to be as thin as possible to save costs; enhanced safety versions, on the other hand, are more robust.
There are no intrinsically safe junction boxes; for intrinsically safe circuits, enhanced safety junction boxes are generally used
Yes, the intrinsically safe junction box comes with an explosion-proof certification.
Stop joking, it’s a basic common sense question – you can’t not know it.
I really don’t understand. According to this definition, and as I see it, a junction box is just an empty shell with no circuits at all – so how can it possibly have Intrinsic Safety certification? It’s acceptable to say that the junction box is integrated with the internal circuits and that there is a unified certification.
Indeed, as I’ve said, this thing is somewhat fantastical; a definition can still be established, but national conditions are what they are. I have many samples from wiring box suppliers on hand, and among them are intrinsically safe wiring boxes. I asked about this matter during previous conversations, and they only said that these boxes meet the requirements of GB/T3836.4. Intrinsically safe boxes are labeled with EXi at the beginning. Since the prices of the other types of wiring boxes were similar, I decided to stick with those, and didn’t ask any further questions. Those who are interested can take a look at that national standard