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as many as will fit, leaving the required % of the area of the conduit as air space. i'll stick my neck on the block and guess at about 10 - 12.
 
As much as tallow/yellow77 will allow you ...............................

But CCC factors for cable is very much dependent on number of circuits, type of circuits and of course loads. The OSG does give a fairly basic guide, but note this is a guide to Physical limitations and don't take account of what I mentioned above.

For that you will need to go to appendix 4 in the BGB.
 
ah, so we employ chubby checker for the job, then.
 

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