Which gauge wire should be used for circuits exceeding 30 amps?

Using an 8-gauge wire for circuits exceeding 30 amps is appropriate because it has a sufficient current-carrying capacity to handle higher loads while minimizing the risk of overheating and voltage drop. The American Wire Gauge (AWG) system specifies that 8-gauge wire can safely carry up to 40 amps for power transmission in most typical applications, which makes it suitable for circuits that require more than 30 amps.

In contrast, smaller gauge wires such as 10, 12, and 14 gauges would not be able to safely handle current levels above 30 amps without the potential for overheating, thereby increasing the risk of electrical faults or hazards. Therefore, using 8-gauge wire ensures both safety and efficiency in electrical systems requiring high amperage.