Best practice to wire an instrument properly and safely
Best practice to wire an instrument properly and safely
(OP)
Good day every one,
I am puzzled/confused on what whould be the best practice when wiring an instrument and its shield.
Is wiring the shield at BOTH ends better? Or wiring at the JB is enough. What are the implications of each method considering the RF and the ground loop error?
Any comments will be very helpful.
Thanks all.
I am puzzled/confused on what whould be the best practice when wiring an instrument and its shield.
Is wiring the shield at BOTH ends better? Or wiring at the JB is enough. What are the implications of each method considering the RF and the ground loop error?
Any comments will be very helpful.
Thanks all.





RE: Best practice to wire an instrument properly and safely
Never connect the shield at both ends! Leave the shield in the instrument side isolated (not connected), and connect the other side of the shield in a ground bar, probably located in one panel.
More details here (in Portuguese, but you can use one web translator) http://www.smar.com/brasil2/shownews.asp?Id=313
RE: Best practice to wire an instrument properly and safely
In other cases, the shield at the end of an instrument probe doesn't always have a termination to go to. In others, there may be a possible termination point, but the grounding scheme might be messed up, and terminating the shield might actually make things worse, as unexpected currents wind up flowing through the shield.
TTFN
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RE: Best practice to wire an instrument properly and safely
For outputs from the control system to actuators the exact opposite is true.