Which factor does NOT affect conductor ampacity adjustments?

The selection of the answer is based on the understanding that the ampacity of conductors is primarily influenced by environmental and loading conditions. Ambient temperature, whether the load is continuous or noncontinuous, and the number of conductors grouped together in a raceway all directly impact how much current a conductor can safely carry without overheating.

Ambient temperature affects the resistance of the conductor; higher temperatures can reduce ampacity. The distinction between continuous and noncontinuous loads is crucial because continuous loads can result in elevated temperatures over time, necessitating adjustments for safety. The number of conductors in a raceway also plays a role, as multiple conductors can result in additional heat due to derating factors, requiring further adjustments to ampacity.

However, the number of phases does not influence the ampacity calculations in the same manner. While it is important for understanding the distribution of loads in three-phase systems, the number of phases does not affect the intrinsic current-carrying capacity of an individual conductor. Instead, it is more related to how power is delivered and used, rather than the physical limitations of the conductors themselves. Thus, this factor does not require adjustments to ampacity calculations.