Final answer:
After accounting for the adjustment factor due to bundling six conductors, the maximum ampacity of an 8-AWG THHN conductor at an ambient temperature of 30° C is 44 amps.
Step-by-step explanation:
The question pertains to the ampacity of a conductor, which is the maximum current that a conductor can handle without deteriorating its insulation or overheating. According to the National Electrical Code (NEC), an 8-AWG THHN conductor can typically carry 55 amps when not adjusted for ambient temperature or conductor bundling. However, when more than three current-carrying conductors are bundled together in a raceway or cable, an adjustment factor must be applied to the base ampacity due to the increase in heat that the conductors will generate. Since there are six conductors mentioned in the question, this results in an adjustment factor of 80%. Therefore, the adjusted ampacity can be calculated as:
Adjusted Ampacity = Base Ampacity × Adjustment Factor = 55 A × 0.80 = 44 A
The correct ampacity for an 8-AWG THHN conductor in an ambient temperature of 30° C with six conductors in the raceway is 44 amps. Thus, the answer is (d) 44 amps.