bonding at sub-panel

[jrygh]

When you install a sub-panel in a seperate building, you keep the neutral and ground bars seperate, right?
It was fed from a main panel with USE cable with innerduct. In a GE 100A residential panel I should be able to remove the buss bar between the two, correct.
Then just bond the ground bar to the tub and to a ground rod?

Do you know the code ref.? (250.32)?

Thanks for you input.

Joe

 

[petersonra]

Re: bonding at sub-panel

I am not so sure it is to the tub and ground bar.

I think you have to bond it to ALL grounding electrodes that are present.

And if your ground rod is less < 25 Ohms you need two of them.

 

[don_resqcapt19]

Re: bonding at sub-panel

Joe,
Does your USE have an equipment grounding conductor? If not the neutral and grounding bars must be bonded. This is the only fault clearing path. Note that if there are other conductive paths between the two buildings, then you must install an equipment grounding conductor with the feeder and seperate the neutral and grounding bars. In either case a grounding electrode system is required at the second building.
Don

 

[johndeereman]

Re: bonding at sub-panel

Read Art,250.32 This should tell you all you will need to know.

 

[badjeepr]

Re: bonding at sub-panel

arent equipment grounding conductors "required" in feeders now regardless of same or seperate building? must be a 4-wire feeder and neutral MUST be floated?

 

[roger]

Re: bonding at sub-panel

Originally posted by badjeepr:
arent equipment grounding conductors "required" in feeders now regardless of same or seperate building? must be a 4-wire feeder and neutral MUST be floated?

Read 250.32(B)(2)

Roger