376-Metal Wireways
I. General
(B) Adjustment Factors. The adjustment factors in
310.15(B)(2)(a) shall be applied only where the number
of current-carrying conductors, including neutral
conductors classified as current-carrying under the
provisions of 310.15(B)(4), exceeds 30. Conductors for
signaling circuits or controller conductors between a
motor and its starter and used only for starting duty
shall not be considered as current-carrying conductors.