EGC's

[joeyww12000]

Just to make sure if Im understanding ground fault current path correct. If I have a 120v 2 wire circuit and a 277v 2 wire circuit in the same conduit I must have 2 EGC's for each system. The reason I ask is some older more experienced electricians I know pull one EGC, making me second guess my knowledge. Maybe one EGC is OK but it must be spliced and terminated in each panel, so a ground fault can return to each systems power source? If I pulled one EGC and had a ground fault from the 277v circuit and the EGC was only connected in the 120v panel this would not allow the OCPD in the 277v panel to open up?

 

[iwire]

One is NEC compliant and as you said when they split to the different panels each must have some type of EGC back to the source with the circuit conductors

 

[Dennis Alwon]

Firstly, what is your wiring method? If it is emt then the conduit is the egc. If it is mc cable then each cable has it's egc that originates at their respective panels. Once the two systems are joined then only one egc is required. There should be some pathway back to each panel.