The neutral loads supplied by the panel will not exceed 310 amps; the neutral in each conduit must be at least a ___ AWG or kcmil.

The neutral loads supplied by the panel will not exceed 310 amps; the neutral in each conduit must be at least a ___ AWG or kcmil.

• A. 350
• B. 1/0
• C. 2
• D. 2/0

Answer: (D)

Sizing the neutral in a conduit that also contains other current-carrying conductors depends on its ability to carry the unbalanced or potential neutral current without overheating. If the panel’s neutral load could reach up to 310 A, the neutral conductor must be large enough to handle that possible current in normal operation. Among the given options, the smallest standard size that provides the needed capacity for this scenario is 2/0. The other choices are either not appropriate standard sizes for this use (350) or are smaller than what’s required (1/0, 2). So the minimum acceptable neutral size in this conduit is 2/0 AWG.

Sizing the neutral in a conduit that also contains other current-carrying conductors depends on its ability to carry the unbalanced or potential neutral current without overheating. If the panel’s neutral load could reach up to 310 A, the neutral conductor must be large enough to handle that possible current in normal operation. Among the given options, the smallest standard size that provides the needed capacity for this scenario is 2/0. The other choices are either not appropriate standard sizes for this use (350) or are smaller than what’s required (1/0, 2). So the minimum acceptable neutral size in this conduit is 2/0 AWG.