1) If a 230V Power passes through a contacts of the relay, which gets energized from the digital ouput of the PLC - will this be considered as Instrument cable or Control cable. I ask this question because there is a separation requirement between instrument cables and control/power cables. For the above case, If we consider that as control/power cables, we could lay the cables in the power/control ladder. However if we should consider that as Instrument cable, we have route it in separate conduit.
2) Solenoid Valve - The cables for solenoid valve should be considered as Instrument cable or control cable or power cable? - if the power supply to the solenoid is 24V, I understand it can be considered as "Instrument cable" but if the power supply to the solenoid is 230V AC, should the cables be considered as "Control cables"?
Note that all the cables are insulated for 600V.
I'm really confused with this instrument/control cables for 230V AC. Is there any codes/standards which clearly demarcates the instrument and control cables for 230V AC loads.
I was told that, all the cables which are terminating at DCS/PLC should be considered as "Instrument cable". Is that right?
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