Is an Equipment Ground Conductor required for Instrument Control Conduits

[Grateful_A]

Hello, curious what ya'll think.

The engineer on a project I am building is not requiring an equipment ground conductor to be installed with the control conduit for 4-20 mA twisted shielded pair cable to from the PLC to instruments. We'll tie the cable shield to ground at the PLC, but we will not have a separate equipment ground to ground the metallic conduit at either side of the run. This would honestly be the first time that I have not run an equipment ground in a control conduit to ground the conduit at each end to the enclosure/instrument.

Any thoughts on the removal of the equipment ground conductor in this particularly installation?

 

[controlsdude]

Maybe the drawings are showing comply with NEC bonding/grounding practices as a general note?
Is not the grounding/bonding of conduit/equipment cases/enclosure a code rule?

 

[waross]

An equipment grounding conductor for 4-20 ma equipment is general practice in many industries and in many engineering standards.
However the Canadian Electrical Code does not generally require equipment grounding for class 1 and class 2 circuits.
The NEC is often very similar to the CEC.

Bill
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"Why not the best?"
Jimmy Carter