I have several questions regarding the junction box and need help
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As the title suggests: 1. The wiring box that came with the on-site complete set of equipment is too small; the wires inside cannot even be inserted. I remember that there are specified requirements regarding the available space inside a wiring box – the terminals should be spaced 100mm apart in all directions. But I can’t recall where I saw this information. Could any of you provide it? 2. The input signals to the on-site junction box are resistance signals and 4-20ma signals; can a multi-core cable be used to transmit both types of signals? I think there’s no problem, but I only knew before that devices with different voltage levels cannot be used together; so I hope someone here can help answer this question. As above, thank you
1. The internal space requirements for junction boxes generally follow certain electrical standards or design specifications. The specific specification requirements may be described in **standards, industry standards, or corporate standards. For example, IEC standards or China’s **standard GB may have relevant regulations. Without specific documents available, one can refer to relevant electrical installation standards or consult the manufacturer. 2. In theory, the resistance signal and the 4-20mA current signal can share the same multi-core cable, as the 4-20mA signal has strong interference resistance; however, care must be taken to prevent interference between the signals. It should be ensured that the cable selection, shielding, and grounding measures meet the requirements for interference prevention. The best approach is to consult an electrical design engineer or refer to the relevant electrical design specifications. .
Use the multi-core wire; it makes no noise at all when in use!
HGT20512-2014
They are usually separated; they are only placed together when there is no other option or if it’s not desired to use separate cables. However, multi-core cables also have separate shielding layers
This type of junction box was surely purchased through the lowest-bid process. Under such a system, the supplier is required to provide the smallest model available in that same specification, otherwise it wouldn’t make sense to award the contract to the lowest bidder. Saving money means paying the price in time and effort.
It was purchased through bidding at the lowest price; what’s the use of looking for standards now that things have already been decided?
Of course not; no matter how low the price, basic **standards** must be met. As long as these standards are clearly defined, it is possible to request a refund or compensation for the difference. Otherwise, inspection and payment at the end would be meaningless.