minimum size multiconductor tray cable

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mikeyt_mk8

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I have a 18 inch wide, 4 inch tall aluminum ladder cable tray with 9 inch rung spacing. It has two 460 volt, 400 amp circuits (6-500 MCM, 2-3 AWG conductors) in it now. I need to run a 460 volt, 60 amp circuit to the same location the tray goes to. I was wondering if I could run a 6 AWG multiconductor tray cable inside the cable tray with the other conductors. What is the minimum size multiconductor tray cable allowed in cable trays?

Thanks,
Mikey
 
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