What is the specified length for #2/0 AWG conductors?

• A. 42-52 ft
• B. 53-66 ft
• C. 67-84 ft
• D. 85-105 ft

Answer: (B)

This question tests the approved run length for #2/0 AWG conductors as defined by R56. In these guidelines, conductor length is linked to keeping voltage drop and impedance within acceptable limits for a given conductor size and typical loads. The specified range for #2/0 AWG is 53–66 ft, so that window best matches the design criteria the standard uses to balance resistance, voltage drop, and practical routing on a site. Shorter runs would not pose a timing or capacity issue but could limit routing options; longer runs could push voltage drop and impedance beyond allowed levels, requiring a larger conductor or a different configuration. The other length ranges fall outside the standard window, which is why they’re not the correct choice.