Cable query

[Lc1]

Hello,
I know that for 4-20ma transmitters twisted pair cable should be used with the screen grounded at one end only. However for digital signals ( limit switches , push buttons ) can 2 core/ part of a multi core cable be used ?

Thanks

 

[Pete999]

Hello,
I know that for 4-20ma transmitters twisted pair cable should be used with the screen grounded at one end only. However for digital signals ( limit switches , push buttons ) can 2 core/ part of a multi core cable be used ?

Thanks

No in my opinion your cable needs to be twisted, shielded and grounded at 1 end to ditch spurious interfering signal, had one problem whereby an AC compressor stopping and starting tripped the UPs control circuit , took me a while to suss the problem, sorted in the end by using a twisted shielded pair for the control circuit, pleased with myself to say the least, boss man was happy as well.

 

[Spoon]

Hello,
I know that for 4-20ma transmitters twisted pair cable should be used with the screen grounded at one end only. However for digital signals ( limit switches , push buttons ) can 2 core/ part of a multi core cable be used ?

Thanks

All depends on the environment the cable is installed in.
And what voltage you are using for the signal.

 

[Lc1]

Thanks for the replies. Cheers