Utility and UPS grounds to a control panel

[Pats3327]

We have control panels that have dual 120vac feeds, one commercial power and one UPS power.
Should the grounds for each be run independently back to the plant ground grid, or can they be bonded together in the control panel, and run one ground wire back to plant ground grid?
Each feed is 20 amps or less.

 

[david]

We have control panels that have dual 120vac feeds, one commercial power and one UPS power.
Should the grounds for each be run independently back to the plant ground grid, or can they be bonded together in the control panel, and run one ground wire back to plant ground grid?
Each feed is 20 amps or less.

So your control panel has two branch circuits suppling it.

 

[jaggedben]

An EGC must be run with the circuit conductors, and it goes back to the source of the circuit, and ultimately to a main or system bonding jumper, not to a 'ground grid'. So if the two power sources enter the control panel in different raceways or cables, then each circuit must have its own EGC. If they share a raceway or cable, then they can share an EGC for the portion of circuit that shares the raceway or cable.

 

[Pats3327]

So your control panel has two branch circuits suppling it.

yes

 

[LarryFine]

Wire each source as if it was the only one.