Howdy, I am designing a system that has [10] parallel sets of 750kcmil Al conductors running between a BESS (Battery Energy Storage System) and PCS (Power Conversion System ie Inverter). I have a question regarding the EGC requirements for these [10] parallel sets, would a 500 kcmil Cu per PVC run (~30ft) be required? There are [11] 400A fuses in parallel as OCPD hence that sizing. We are debating this because there is 250.134 "Equipment Fastened in Place or Connected by Permanent Wiring Methods (Fixed) — Grounding…(B) With Circuit Conductors: By connecting to an equipment grounding conductor contained within the same raceway, cable, or otherwise run with the circuit conductors." Additionally exception 2 that states "that for DC circuits the EGC shall be permitted to be run separately from the circuit conductors".
Our main issue is that the equipment does not have provisions to land that many EGC's, and the manufacturer has stated that they don't even want any EGC. Additionally we do have a ground grid in this design and the chassis of each equipment is bonded to the ground grid.
Our main issue is that the equipment does not have provisions to land that many EGC's, and the manufacturer has stated that they don't even want any EGC. Additionally we do have a ground grid in this design and the chassis of each equipment is bonded to the ground grid.
