Question

If 11 current carrying conductors are to be installed in a raceway, their ampacity must be adjusted to _______________ % of their full current value.

Answer 1

If more then 10 conductors are in raceway then the ampacity must be adjusted to 50 % of their full current value.

As this is also depends upon the ambient temperature and the conductor type but the above one is for general

Where the number of current-carrying conductors in a raceway or cable exceeds three, or where single conductors or multi- conductor cables are stacked or bundled longer than 24 inches without maintaining spacing and are not installed in raceways, the allowable ampacity of each conductor shall be reduced as shown in the following table: Number of Percent of Values in Current Carrying Table as Adjusted for Conductors Ambient Temp., if Necessary 4 thru 6 7 thru 9 10thru 20 21 thru 30 31 thru 40 41 and above The above derating factors do not apply to conductors in nipples having a length not exceeding 24 inches.