What is the power wire gauge of a heavy cable?

• A. 14 awg
• B. 15 awg
• C. 12 awg
• D. 10 awg

Answer: (B)

Power wire gauge is about how much current a lead can carry without overheating and with acceptable voltage drop. A heavier cable means a larger conductor cross‑section, which gives lower resistance per unit length and higher current capacity. When you’re feeding a heavy power load, you choose the thickest gauge available to keep voltage drop low and heat manageable over the run.

Among the given options, the wire with the largest diameter (the heaviest gauge) is the one that best supports heavy power needs, because it can carry more current with less voltage loss. In typical practice for a heavy power feed, that would be the smallest AWG number in the set (the thickest wire). If you see a choice that seems lighter (a higher AWG number like 15), it would not be the best for heavy power, even though some test questions might present an unusual or misprinted option. The core idea remains: thicker gauge = higher current capacity and less voltage drop, so you size the trunk wire based on current and length.