if i am running 24VDC RTD cables,230VAC for space heater and 105VAC PT signal cables in same cable tray...will there b any interference(EMI) between 24VDC and 230VAC...is there any problem.....
The AC cables should be segregated from the DC cables, if possible via a segregation barrier as in some types of 2 compartment trunking.
But this is not always possible. So if they have to occupy the same tray make sure they are spaced far apart as possible and that the AC neutral conductors are together with there relevant phase conductor to reduce the amount of EMI radiating from the circuit.
If there spaced far enough you should not have a problem.
Of course there will be EMI happening on your cables. The only difference between your wires and the wires of an antenna is the user's desire to look for these signals. I doubt that the EMI signals will be high enough in power to cause a problem for your Resistive Thermometer Devices if you properly shield the wires. I am also certain that one could wire this up and produce a completely useless set of signals. Some times it requires on site inspection of your environment to know the suitability of the wiring. This is one of those times.
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"Don't disturb my circles." translation of Archimedes last words
It matters how far the cables run together in the trunking. A few metres is probably OK, but if it is 100 m, then you need the pairing of cables and separation mentioned by other posts. Even if it seems OK normally, you could get protection [fed by RTD] operating for switching surges or short circuits in the AC circuits.
Electro Magnetic Interferance(EMI)
Re: Electro Magnetic Interferance(EMI)
