Which of the following AWG sizes represents the smallest conductor?

The smallest conductor in American Wire Gauge (AWG) sizing is represented by the 18 AWG size. In the AWG system, as the gauge number increases, the diameter of the conductor decreases. This means that 18 AWG wire is thinner than both 10 AWG and 0 AWG, as well as 3/0 AWG.

For context, 10 AWG is used for applications that require a larger conductor size to support higher current levels, while 0 AWG and 3/0 AWG are even larger, suitable for heavy-duty applications such as power distribution. The numbering system for AWG starts with a lower numerical value for thicker wires and increases as the wire diameter decreases.

Therefore, identifying 18 AWG as the smallest conductor is based on its position within the established size hierarchy of wire gauges.