JasonWrenn
Member
- Location
- Louisville,KY
In regards to the Equipment Grounding Conductors, I have parallel runs of conduit that stub out of a switchgear and stop before connecting to cable tray. I say that the equipment bonding jumpers that go from the conduit grounding bushings to the cable tray need to be sized based off of Table 250.122. It is a 1600amp frame breaker, 1200amp trip setting installed in the breaker, and it has adjustable GFCI protection set at 300amps. I believe the size of the EGC should be a 4/0 based off the frame size. I have an engineer here that thinks since this is an "engineered system" that the EGC can be sized from the GFCI setting at 300amps, and since Table 250.122 says "Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc., Not Exceeding (Amperes)", that it can be sized off the GFCI "setting".
I have never thought of sizing EGC like this and have been task to show the engineer otherwise, PLEASE HELP.
I have never thought of sizing EGC like this and have been task to show the engineer otherwise, PLEASE HELP.