My case is that some sensor is outdoor, if some of sensor is get voltage more than limit, it can burnt micro-controller and another things, if 220v wire is insulation broken and current is leak to 5v sensor wire it can burnt almost all things... if there is voltage spike from 220v that go in 5v relay it can also burnt micro controller... lightning... and something like that...You really need to think this thing out. if the signals are digital, think the I2C bus.
One thing for sure, 28 AWG is too small. Krone might work for you, but not 110, but only if you can make the wires thicker.
I did a very unique wiring method for a rack for analog I/O, digital I/O and instrumentation. One instrument has digital, analog in and analog out and the cards were analog in, analog out and digital.
i took this enclosure: https://lmbheeger.com/uni-pacuniversalpackagingsystem.aspx without rack handles because they are ugly. I added my own and installed drawer slides. The top cover was never fastened down. I did one magnetically.
I replaced the back with two 1/4" stainless rods with a threaded hole in the ends. I replaced the back panel with the two rods.
I could bring an instrument into one box as cables, strain relieved to the rods. That instrumentmight go from a 9-pin D to a9-pin-D breakout board. Some would go to digital, some analog in and some analog out.
Analog in was a big mux. Analog out came from 3 cards as ribbons. Digital came from multiple cards as large ribbons. It worked out really really nicely and easy to troubleshoot.
There was a larger case that held a backplane of signal conditioners and power and I only needed one isolated conditioner.
Again, everything came from their native instrument as a connector to connector. The connector was terminated into a connector breakout with screw terminals. Wires could exit as cables with connectors if need be. Point is, I didn't have to drill chassis specific holes.
I objected to the "powers that be" in having computer based cards. This initially was a Macintosh NuBus machine with 5 or six slots. Newer macs had 3 and later an entirely different bus. "They" had to replace obsolete technology with obsolete technology. It wasn't my problem. "They" said cards in the computer. I objected. "They" won.
In this design, I also put rack rails on Unistrut which was the framing for the system.
CAT 5 cable isn't digital, is analog signal, like micro-switch, LDR, PIR, ...Sounds like a standard I/O problem except that you apparently are trying to throw CAT 5 cable into the mix. Look at Intrinsic Safety Barriers. They are used for standard 4-20 mA instrument circuits leaving a general-purpose control room to enter an explosive atmosphere hazardous area to limit the current to a non-hazardous level through Zener diodes and fuses. We often had 19 individually shielded twisted pair No 22 AWG cables coming into control room racks that had to be terminated and distributed and required safety energy level protection. Screwed terminal strips and punchdown blocks were commonly used and we had large numbers of cables coming from the field that had to be marked for identification, terminated, and distributed to the DCS hardware. Do not mix digital communication and analog sensor/output signals.
That wire is for smart office project not for industry control devices... example : smart door control (open/close with fingerprint, RFID, ...), smart lighting control (on/off lamp when human present is detected by PIR sensor, radar sensor, ...), and another such thing...CAT 5 cable isn't digital, is analog signal, like micro-switch, LDR, PIR, ...
The independent sensor boards would still communicate with the central MCU just not as a home run for each. They would use a bus, like RS-422 or RS-485 to send their data there. Some might still be home runs if that’s better for a particular application but it would reduce the number of conductors if you used a bus and you can use a loop to wire things making everything easier.Can't because micro-controller is centralized in one place, by consumer requirement and contract
Maybe you need to consider designing standalone sensor boards that can send cooked data via a bus instead of home runs for each.
No... it's in China... not really safe... because this also in office... if in operation room safety is maximized (voltage stabilizer, voltage relay aka under/over voltage relay, phase fault relay, MCCB, MCB, also MCB is doubled with NH fuse, 30mA RCCB, also isolation transformer for each device, also online UPS for each medical device with data center grade (built-in stabilizer, also minimized harmonics and power factor problem and 0.001 switching time and add with external battery(normally 12v 50ah we replace it with 12v 400ah)), and generator set also battery bank, fire control system, door lock access with fingerprint, CCTV with face recognizion and more things)Later new installations often used ladder trays for cable distribution throughout the operating areas. We could not mix power and instrument cabling in the same tray as required by the safety restrictions. Power cabling was for 480VAC motors with 120VAC controls all in the same cable. Instrumentation was 4-20mA intrinsically safe analog signals. You mentioned Hospital so you have safety standards that must be adhered to. Wiring must meet safety requirements for plenum and conduit enclosures as specified by those standards. All those requirements should have been laid out during the initial scope of the project and not as an afterthought. When dealing with safety standards that is the framework that all design and construction must adhere to. Those are your restraints, and all your project design must fit within that limited framework. Part of the initial project design was a multidisciplinary safety review of the projects to set the boundaries of the project scope that had to be adhered to.
Even that operating room building can survive if earthquake about 8 magnitude squazed that buildingNo... it's in China... not really safe... because this also in office... if in operation room safety is maximized (voltage stabilizer, voltage relay aka under/over voltage relay, phase fault relay, MCCB, MCB, also MCB is doubled with NH fuse, 30mA RCCB, also isolation transformer for each device, also online UPS for each medical device with data center grade (built-in stabilizer, also minimized harmonics and power factor problem and 0.001 switching time and add with external battery(normally 12v 50ah we replace it with 12v 400ah)), and generator set also battery bank, fire control system, door lock access with fingerprint, CCTV with face recognizion and more things)
And we oversized all conductor capacity by 250% from max continuous load, also all protective ground we used is 240mm², also with 2" copper lightning terminal, Chinese Communist Important Person was served here in this building in about 2008 - 2014 before moved to another central hospital, also this is teaching hospitalEven that operating room building can survive if earthquake about 8 magnitude squazed that building
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by Jake Hertz
by Jake Hertz