I need to deliver 300A at 48VDC from a rectifier to a plating cell. My rectifier supplier says to use 4/0 conductors, but that doesn't seem to jive with NEC. What am I missing?
If the conductors are bus bars in auxiliary gutter, and I size the conductor for 125% of the load, then I need 300A * 1.25 / 1000A-per-sq-in = 0.375 sq-in copper per pole, or 400kcmil.
If I use Table 310.16, and 90deg-C wire, and again size the conductor for 125% of the load, then it calls for 400kcmil conductors. (I assume I'd use two 2/0 in parallel per pole).
What am I missing?
Thanks,
SHOOP
If the conductors are bus bars in auxiliary gutter, and I size the conductor for 125% of the load, then I need 300A * 1.25 / 1000A-per-sq-in = 0.375 sq-in copper per pole, or 400kcmil.
If I use Table 310.16, and 90deg-C wire, and again size the conductor for 125% of the load, then it calls for 400kcmil conductors. (I assume I'd use two 2/0 in parallel per pole).
What am I missing?
Thanks,
SHOOP