ISOLATED GROUND BAR

[pqpro]

In a 2 pole 3wire-fused-general duty-100amp-indoor-Saftey Shift With NO Nuetral with a mechanical {dirty} ground bar and a Isolated {clean} Ground conductor identified with yellow tracer terminated on the nuetral bus bar supplied by the manufacture. Is there any thing wrong with the termination here??? The green screw provided is not used and the bar is used just as splice point. The IG conductor is from a k-type, isolated XFMR were it is bonded with XO an d cold water pipe per code and the safety switch feeds a 6000 kva Symmetra UPS WITCH IN TURN FEEDS A "DEDICATED" LOAD CENTER...... IS THERE CODE THAT SAYS I CAN DO /OR NOT DO????PLEASE ADVISE thanx PLF.

[ May 12, 2003, 12:45 PM: Message edited by: pqpro ]

 

[bennie]

Re: ISOLATED GROUND BAR

The isolated ground conductor should terminate on the same bus as the ground electrode conductor.

 

[luke warmwater]

Re: ISOLATED GROUND BAR

Bennie, would that hold true if there was a MAIN switch ahead of this one? If this switch was fed from a main panel, then would you keep it isolated until you got back to the main panel, where you would terminate on the GEC bar?
In pqpro's case, are you saying that if the neutral bar has the bond screw installed, that would be acceptable?

 

[bennie]

Re: ISOLATED GROUND BAR

Keep in mind the isolated ground conductor is a voltage reference primarily, and a fault clearing conductor second.

If the primary purpose is to clear a fault the connection will be at nearest point to permit low impedance.

The isolated ground conductor should connect as close to the earth reference plane as possible. There will be common mode voltage, at the service panel, between the neutral and earth.