392.8 (d) conductors in cable tay Paralleled Shall be Grouped.
392.11 (B)(2) single conductors 1/0 to 500 kcmil grouped shall be derated at 65% per tables 310.17 -310.18 .
tray no cover free air copper 500 kcmil=(700amp at 90%c) (for derateing only)x 65% = 455 amps per group.
Unless installed with free air space per 392.11 (b)(4)then table 310.20 (500 kcmil=580amps at 90c )
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