P
Hello list members, I have a question. What would be your comments on using "normal" house-wiring or non-instrumentation-grade cables for 4-20 ma links? Normally we use special shielded cables (belden 8761 for example) as recommended by PLC manufacturers, grounding one end only, etc..
I realize (and have experienced) the importance of
special cables for noise reasons in analog voltage
signals, but for 4-20ma loops in a light industrial scenario, where not much noise is expected from large motors, contactors, or VFDs, do you think we could do without special cables, as long as the loop resistance limitations are met?? Any comments, recommendations, or links to the subject would be very welcome. By the way, I remember hearing one time (possibly on this list) that twisted pairs of cables are NOT recommended
in 4-20ma loops, or that separate single cables should not be twisted together in 4-20ma loops. Any comments on this also?
Thanks and regards, Pat
I realize (and have experienced) the importance of
special cables for noise reasons in analog voltage
signals, but for 4-20ma loops in a light industrial scenario, where not much noise is expected from large motors, contactors, or VFDs, do you think we could do without special cables, as long as the loop resistance limitations are met?? Any comments, recommendations, or links to the subject would be very welcome. By the way, I remember hearing one time (possibly on this list) that twisted pairs of cables are NOT recommended
in 4-20ma loops, or that separate single cables should not be twisted together in 4-20ma loops. Any comments on this also?
Thanks and regards, Pat