NEC

[BA Evans]

On a typical control circuit protected by a fuse or circuit breaker, where you would have 120vac/125vdc running to a pressure switch and then energizing a solenoid valve, would a ground (in addition to the grounded neutral) conductor be required to be run in the entire circuit and this ground terminated at each device (pressure switch, solenoid valve)? This would be in a power plant environment.

[ August 17, 2005, 02:25 PM: Message edited by: BA Evans ]

 

[charlie b]

Re: NEC

Run in the entire circuit? Yes.

Terminated at the pressure switch? No.

Terminated at the solenoid valve? Yes.

You have to run the ungrounded (phase, or "hot" conductor) and the grounded (neutral) conductor together. But the neutral only has to be landed at the load (in your case, the solenoid valve).

 

[physis]

Re: NEC

You don't have to, but if you use the edit function to change the name of the "topic" of one your two threads it would be a lot easier to know which one's which.

If you click this icon

you'll be able to edit your post.

 

[petersonra]

Re: NEC

Originally posted by charlie b:
Terminated at the pressure switch? No.

It would not need to be terminated at the pressure switch but may well need to be connected to the ground terminal there.

 

[redfish]

Re: NEC

would a ground (in addition to the grounded neutral) conductor be required to be run in the entire circuit and this ground terminated at each device (pressure switch, solenoid valve)? This would be in a power plant environment.

Yes, you would be required to have an EGC ( equipment grounding conductor).If you are installing metallic conduit, this can serve as your EGC.