We have an installation where the plans call for 3 sets of 4 600 MCM and 3/0 grounding conductor in 3-3 1/2" conduits. These conduits are installed (in concrete!) and feed a 1200 amp switchboard, also already installed.
However, the switchboard will only accept up to 4 - 500MCM cables. 600MCM is too big for the lugs available, and the manufacturer tells us there is no lug kit that will fit. Running two parallel sets of 4/0's in each raceway (6 total wires per phase) is not an option, because we can only land 4 wires per each phase on the switchboard.
However, the switchboard will only accept up to 4 - 500MCM cables. 600MCM is too big for the lugs available, and the manufacturer tells us there is no lug kit that will fit. Running two parallel sets of 4/0's in each raceway (6 total wires per phase) is not an option, because we can only land 4 wires per each phase on the switchboard.