Ladder tray bonding jumper

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A ladder-type cable tray which is 12" wide, has 4 sides and is made of 3/16" thick aluminum is used as an equipment grounding conductor and is protected by the maximum size overcurrent device required. The minimum size copper equipment bonding jumper required to connect sections of this cable tray is_____?

I did an equivelent calculation in my apprenticeship. I just can't remember if there was a chart for it. Thanks for your help!
 
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