Final Answer:
It offers adequate space to accommodate three No. 3 T90 NYLON and two No. 8 T90 NYLON stranded conductors in rigid PVC. Therefore the correct option is c Trade size 41 (1 ½") conduit is required.
Step-by-step explanation:
The size of conduit required for three No. 3 T90 NYLON and two No. 8 T90 NYLON stranded conductors in rigid PVC is determined by calculating the total area of the conductors and matching it with the available space in different conduit sizes. The total area of the conductors in this scenario is best accommodated by a trade size 41 (1 ½") conduit, ensuring proper fitting without overcrowding or compromising safety.
To determine the conduit size, the areas of the individual conductors are calculated using the American Wire Gauge (AWG) table, considering the specific wires used (No. 3 and No. 8 T90 NYLON stranded conductors). Then, the sum of these individual areas is computed to find the total area that needs to fit within the conduit.
The calculations account for both the physical dimensions of the conductors and the allowable fill capacity of different conduit sizes. Among the options provided, the trade size 41 (1 ½") conduit offers sufficient space to comfortably accommodate the combined area of the specified conductors, ensuring compliance with safety standards and efficient installation practices.
Therefore the correct option is c Trade size 41 (1 ½") conduit is required.