Final answer:
The ampacity of a conductor is the maximum electric current it can safely carry. Ampacity is influenced by the conductor's size, the number of conductors in a conduit, and the ambient temperature, which is derated using the National Electrical Code (NEC) tables. A precise value cannot be given without consulting the NEC.
Step-by-step explanation:
The ampacity of a conductor refers to the maximum amount of electric current a conductor can carry before it becomes unsafe, due to overheating. The determination of the ampacity involves not only the gauge of the wire (in this case 14 copper RHH) but also the number of conductors in a conduit and the ambient temperature. When multiple conductors are bundled together, like in a single conduit, their combined heat could lead to higher temperatures, which in turn lowers the ampacity of each individual conductor. However, to calculate the precise ampacity, one would need to refer to the National Electrical Code (NEC) tables which provide ampacity ratings based on conductor size, type, and the number of conductors in the conduit.
As for the ambient temperature, the NEC also provides correction factors for temperatures other than the standard 30°C. Since the ambient temperature in this scenario is 45°C, the ampacity would need to be derated accordingly. But without the specific NEC tables and calculation methods used for these scenarios, we cannot provide a definitive ampacity value. It's always recommended to consult a professional electrician or the latest NEC handbook when making such determinations for safety reasons.