When are EGC's required on subpanels being renovated/replaced?

[CelectricB]

The MEP consultancy at which I work is doing a renovation on a rural school. There are 3 separately derived systems feeding the main building, and most sub panels do not have an EGC. We plan to replace most of the sub-panels, so is it required that EGC's be included on all of them? Also, would it be appropriate to say that each separately derived system requires its own GEC & bonding jumper to the building structure?

 

[don_resqcapt19]

Yes, each SDS requires a connection to a grounding electrode system, a system bonding jumper, and a supply side bonding jumper between the SDS and the first OCPD. Any equipment on the load side of the first OCPD will require an EGC.

 

[LarryFine]

. . . most sub panels do not have an EGC.

If the feeders are in metallic conduit, you have an EGC.

 

[Eddie702]

What @LarryFine said