Richard Carlson
Member
- Location
- Sidney, MT
What is the industry standard for using the ground wire when energizing a solenoid from a PLC 120VAC output
Are you asking whether the solenoid needs to be grounded? Or what size wire to use? It seems to me "likely to become energized" so an EGC or bond would have to be supplied.What is the industry standard for using the ground wire when energizing a solenoid from a PLC 120VAC output
I'm coming out of a PLC 120VAC output 'fused' at 4 amps and controlling a 4 solenoids with the common going back to a common in my PLC cabinet, do I need to run grounds out to the solenoidsAre you talking the equipment grounding conductor or the neutral (grounded conductor). The equipment grounding conductor is not to be used as a current carrying conductor.
What is the industry standard for using the ground wire when energizing a solenoid from a PLC 120VAC output
Post #5 (passing in the night) removed that seeming. It is just a question of whether some sort of EGC (wire or raceway) must be run to the solenoids.As Dennis said, the EGC can not be used as current carrying conductor which seems to be what you are asking.
Roger
Are you asking whether the solenoid needs to be grounded? Or what size wire to use? It seems to me "likely to become energized" so an EGC or bond would have to be supplied.
The "120V output" from a PLC could be a power-limited output or could be subject to standard wiring rules.
I'm coming out of a PLC 120VAC output 'fused' at 4 amps and controlling a 4 solenoids with the common going back to a common in my PLC cabinet, do I need to run grounds out to the solenoids
We have a communication problem here. If what you are calling a "common" is by design a current carrying conductor and you are asking about bonding the solenoids, the answer with the information you have given is yes, the solenoids need to be bonded with an Equipment Grounding Conductor.
Roger
I think OP possibly needs a better understanding between the differences between a "grounded" conductor and an "equipment grounding" conductor. He needs to forget about the fact he has a PLC and forget that he has a solenoid for a moment and understand the general rules of power source, services/and or feeders, separately derived system, then grounding and bonding, and the fact that he has a load that happens to use a "grounded" conductor as one of its supply conductors.We have a communication problem here. If what you are calling a "common" is by design a current carrying conductor and you are asking about bonding the solenoids, the answer with the information you have given is yes, the solenoids need to be bonded with an Equipment Grounding Conductor.
Roger
The material goes up by a third and the labor goes up a bit....
How much difference in time and money can it possibly make to pull the green wire(s)?
SceneryDriver
I agree with Don and to clarify my other posts, when I am saying EGC I am not saying it needs to be a wire, it can be any of the EGC's recognized in 250.118.The material goes up by a third and the labor goes up a bit.
Pretty simple:
black wire(s) are HOT wires - they go to the PLC outputs (in this case)
white wire(s) [or the other power wire from the solenoids' coils] are the NEUTRAL wires - they go to the neutral bar/terminals in your panel
green wire(s) are the GROUND wires - if they're present, then they go to the ground bar/terminals in your panel
How much difference in time and money can it possibly make to pull the green wire(s)?
SceneryDriver
It has only been in the past 10 years or so that I have seen the solenoid coil with the green wire. Prior to that, if there were any metal exterior parts, the only EGC that you could use would be the raceway that connected to the solenoid.What do I do if the solenoid has just two red wires? hmy:...
It has only been in the past 10 years or so that I have seen the solenoid coil with the green wire. Prior to that, if there were any metal exterior parts, the only EGC that you could use would be the raceway that connected to the solenoid.
Those are the ones I am thinking of, I don't recall seeing EGCs on those that far back.Can't speak for all solenoid valves, but ASCO "Red Hat" valve coils have had a green wire for at least 20-25 years from my experiences with them.