386-Surface Metal Raceways
I. General
of conductors or cables installed in surface metal raceway shall not be greater than the number for which the raceway is designed. Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles.
The derating factors of 310.15(B)(2)(a) shall not
apply to conductors installed in surface metal raceways
where all of the following conditions are met:
(1) The cross-sectional area of the raceway exceeds