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Answer :
Final answer:
To find the ampacity of 3/0 AWG THHN aluminum conductors, NEC tables and correction factors are used. The ampacity is 155 amperes at 30°C, adjusted to 149 amperes at 35°C ambient temperature for six current-carrying conductors, rounded to the nearest ampere.
Explanation:
To determine the ampacity of 3/0 AWG THHN aluminum conductors in a specific application, we must consult the National Electrical Code (NEC) tables for the ampacity ratings of conductors and adjust for conditions such as ambient temperature and the number of current-carrying conductors.
Firstly, from NEC Table 310.15(B)(16), the ampacity for 3/0 AWG aluminum conductors with THHN insulation in a raceway or cable is 155 amperes at 30°C ambient temperature. However, if the ambient temperature is higher than 30°C, we need to apply a correction factor from NEC Table 310.15(B)(2)(a) to adjust the ampacity. At 35°C, the correction factor for THHN insulation is approximately 0.96.
Next, if more than three current-carrying conductors are bundled together, NEC Table 310.15(B)(3)(a) specifies an adjustment factor that must be applied. Since only six of the nine conductors are current-carrying, no adjustment is necessary.
Finally, we calculate the corrected ampacity: 155 amperes × 0.96 correction factor = 148.8 amperes. We round this to the nearest ampere, which gives us an ampacity of 149 amperes.
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