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Cable tray multiconductor calculation

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R

ramihamdan

Member
Location
indiana
Occupation
Electrician
What is the cable tray size, using nec 2008 table 392.9?
This is a NEC question from an exam prep site.
 

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ron

ron

Senior Member
Location
New York, 40.7514,-73.9925
Where 4/0 AWG or larger cables are installed in the same cable tray with cables smaller than 4/0 AWG, the sum of the cross-sectional areas of all cables smaller than 4/0 AWG shall not exceed the maximum allow-able fill area resulting from the calculation in Column 2of Table 392.9 for the appropriate cable tray width. The4/0 AWG and larger cables shall be installed in a single layer, and no other cables shall be placed on them.
 
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