Is an explosion-proof junction box necessary for this occasion?
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I was involved in the instrumentation work for a chemical engineering project. There are 62 circuits for temperature, pressure, level, and electric valves on site ； The on-site equipment is arranged from east to west, with a total length of 48 meters. The instrument control room is located at the other end of the site, 30 meters away. Do you need an explosion-proof junction box? Did adding an explosion-proof junction box make wiring and fault finding easier? Please give your support, experts.
What kind of chemical processing equipment? Can electrical sparks caused by medium leakage lead to an explosion?
Chemical processing projects generally require explosion protection
Whether it is explosion-proof is a requirement of the process medium; using a junction box can save on cables.
1. No junction box is required; the length of the cables is estimated to be around 80–150 meters on average, which is about seven or eight kilometers in total. Cables of the same specification can be combined together. 2. You use junction boxes; the main cable runs for 70 to 80 meters. There are roughly 10 junction boxes needed. For a 1-kilometer length of main cable, along with branch cables of 10X62, that’s about 800 meters in total. The 1-kilometer main cables are not necessarily of the same specification; each specification can only be supplied in a single coil, and there is also a minimum order quantity required. . . . The junction box designed to prevent BAO issues costs 2,000 yen each; in addition, there are also accessories needed to prevent BAO issues, such as cable glands and BAO-proof seals. In total, the cost comes to at least 25,000 yen. You also need to account for the construction costs of installing the junction box and wiring the terminals of the junction box. I did some calculations, and the costs of the two are roughly the same (about 5,000 yen). Moreover, the terminal blocks in the junction box also represent a potential hazard. In summary, I recommend not using a junction box and instead running the cable directly to the control room. But there is one problem: adding more tables (cables) in the future will be troublesome, as the cables will need to be rerouted ； With a junction box, there is no need to use a main cable (which has spare cores), so the owner can carefully weigh the investment against maintenance costs. . .
Thank you all for your answers. I think what was said upstairs is absolutely correct. Installing explosion-proof junction boxes can save on the cost of purchasing cables. It facilitates fault detection and the addition of circuits. It facilitates subsequent work.