Which scenario would NOT require the application of T. 310.15(C)(1)?

Option B is correct because a metal wire way with 25 underground branch circuit conductors does not fall under the conditions typically addressed by T. 310.15(C)(1), which provides guidelines for adjusting ampacity based on the number of conductors within a raceway or cable. This particular provision is often concerned with the derating of conductors due to heat buildup when multiple conductors are bundled together.

In the case of a metal wire way containing conductors that are underground, the heat dissipation characteristics and the environment can differ significantly from what T. 310.15(C)(1) addresses. The metal construction of the wire way may allow for better heat dissipation compared to conduits or other types of raceways. Additionally, the underground installation often results in unique thermal considerations that alter the application of the ampacity adjustments called for by T. 310.15(C)(1).

Each of the other scenarios involves specific conditions or configurations where T. 310.15(C)(1) would apply—such as conductor grouping within conduits or raceways, leading to potential overheating issues that require appropriate adjustments to ensure safety and compliance with electrical codes.