Can a temperature compensation cable be used as an electrical signal cable?
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The installation company placed the cables incorrectly; the electrical signals from the MCC to the DCS (operation, stop, fault, current) were wired as temperature compensation cables. Can they still be used? Each one is approximately 30M in length.
Sure, no problem. It will just waste some wire, but it can be used as a spare wire: lol
When a compensation wire is used as a regular wire, it is equivalent to inserting a thermocouple into the circuit. If there is a temperature difference at both ends of the compensation wire, a thermoelectric potential will be generated. If this potential is used to transmit control signals, additional errors will occur, leading to incorrect display and control； If used as a power source, the high resistance will cause severe heating, which may lead to accidents~~~
Running, stopping, and fault are digital signals; even if the compensation wires generate a thermoelectric potential, it is on the order of mV, so it has no impact. There’s no issue with using a current signal either; it’s just 4–20mA, so how can it generate heat? :Lol, if it’s in the wrong place, just use it; it’s fine.
If the electrical signal is digital, then there is no problem
Of course not; the material of the temperature compensation wire is not just copper, and it cannot be replaced
According to national standards, there are 7 classification numbers for compensation wires. Except that the compensation wires for types B, R, and S3 thermocouples are their corresponding copper wires, the compensation wires used with the other 4 types of thermocouples have essentially the same material; the difference lies in the content of metal components. Therefore, only the first 3 types of compensation wires can basically meet the requirements for electrical signal transmission, while the other 4 types of compensation wires must never be used as ordinary wires.
There’s no problem with this; it’s basically usable. Its internal resistance is very low, and the shielding effect is good. Besides, the length is only 30m, so you can use it with confidence