Regarding explosion protection issues
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According to the experts, in explosion-proof areas, an explosion-proof hose must be used for the cable that runs from the conduit to the electrical and instrumentation equipment; if it is a armored cable, a hose is not necessary. I don’t see any specific indication in the installation manual that the cables need to be armored. I think it’s sufficient to seal the electrical and instrumentation connections with explosion-proof connectors and to block the openings of the conduit tubes; it’s not necessary for the cables to be armored. Does anyone have a standard citation guide?
Armoring is generally used when laying it underground, right? At the outlet of the wire conduit, a cable guard cap can be used, or explosion-proof putty can be applied (in cases where no flexible tube is used); at the instrument end, explosion-proof cable glands are used ； If a flexible tube is used, a tee wiring box must be added to the protective tube, which is then connected to the flexible tube and subsequently to the instrument. It’s in the latest installation manual. One is continuous and the other is discontinuous.
In explosive environments, explosion-proof hoses are generally used for connections
Our factory has undergone many safety inspections, and there are many areas that need to be improved. During the subsequent rectification process, many standards were consulted, and most of them met the requirements. I feel that today’s experts consider anything that can be optional to be mandatory, but usually, elements that are optional in the design process aren’t included. It may be related to the current safety situation in the chemical industry; generally, the standards are quite strict. It is recommended to make corrections in accordance with the “experts’” advice.
Proper use of Goran heads and plastic sheathed cables can fully meet the explosion-proof requirements. There is no requirement to use armored cables. For specific requirements, refer to the national standard GB 3836.15-2000 \"Electrical equipment for explosive gas environments – Part 15: Electrical installation in hazardous locations (except coal mines)\"
For remote instrument cables in explosion-hazardous areas, if unarmored cables are used, they are connected with explosion-proof flexible conduits; if armored cables are used, explosion-proof armored gland connections are used.
Could you tell me about that standard?
In areas with explosion hazards, armored cables can be installed directly, with explosion-proof glands used at the ends for connecting the cables; unarmored cables require protective sleeves, and the ends of these sleeves must be sealed with explosion-proof flexible pipes. The cables must not be exposed at any point along their length
If the cables cannot be left exposed, then in explosion-proof areas, unarmored cables laid in ladder-type tray systems still end up leaking out. How can this be explained? Hehe!
What does armored cable have to do with explosion protection? Experts are complete idiots.
He simply doesn’t know, because there’s no such standard.