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Section 310.15(B)(6) provides specific requirements that say a grounding or bonding conductor is counted as a current carrying conductor.
In addition, a neutral conductor may or may not be counted as current-carrying, depending on its actual load, the type of load and the type of system it's connected to, according to Section 310.15(B)(5).
Table 310.15(B)(3)(c) addresses ambient temperatures for raceways that are exposed to sunlight on a roof, establishing an additional ambient temperature increase because of solar heat gain. If applicable, this table must be used to determine ambient temperature before the correction factors of Section 310.15(B)(2) are applied.
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