Which of the following is a correct pairing of AWG size and its maximum length?

• A. #1/0 AWG – 42-52 ft
• B. #2/0 AWG – 42-52 ft
• C. #3/0 AWG – 85-105 ft
• D. #4/0 AWG – 53-66 ft

Answer: (A)

When sizing a feeder run, how long you can run the wire depends on the conductor size and the allowable voltage drop for the load. In Motorola’s R56 guidance, there’s a table that links AWG size to a maximum run length under a given current and voltage-drop assumption. The thicker the wire, the lower its resistance per foot, which generally lets you go farther before the voltage drop hits the limit.

The correct pairing is the one that matches that table for the given assumptions: 1/0 AWG with a maximum length of about 42–52 ft. This reflects the point at which the voltage drop meets the allowed limit for that gauge under the standard conditions used in the guideline. The other options don’t align with the standard table values for these same assumptions, so they aren’t the correct match.