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4-20ma Cabling - 3Wire

Les Spiteri
I have read many times about how it is beneficial to wire 4-20ma loops using twisted pair, however what if the wiring is 3 wire (i.e. +,- and signal)?
  • Does this mean that you simply use screened three core?

  • Does this mean you use two twisted pair and if so what one is the single?

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  • 0
    Thanks, excellent response Graham, I suppose a follow up question comes where a digital signal wire is run in the same cable.
    • If that signal is run in a four wire cable with the three wire 4-20 device then could that in any way effect the 4-20 signal?

    • And if using a two wire 4-20ma in a twisted pair then presumably the digital signal could be run in a single wire of the second pair without concern?

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  • 0
    Thanks, excellent response Graham, I suppose a follow up question comes where a digital signal wire is run in the same cable.
    • If that signal is run in a four wire cable with the three wire 4-20 device then could that in any way effect the 4-20 signal?

    • And if using a two wire 4-20ma in a twisted pair then presumably the digital signal could be run in a single wire of the second pair without concern?

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