For a 1-hp ACU, what should be the appropriate wire/cable size?

The appropriate wire or cable size for a 1-horsepower (hp) air conditioning unit (ACU) is critical for ensuring both safety and efficiency in electrical installations. A 1-hp ACU typically requires a current of approximately 4.4 to 5 amps under normal operating conditions. However, considering factors such as voltage drops, starting current (which can be several times higher than the running current), and potential overload conditions, a larger wire is often recommended for reliable performance.

Choosing 5.0 square millimeters, rated for 30 amps, provides a safety margin that accommodates these factors, ensuring that the wiring can handle both the typical running load and any potential inrush current when the unit starts. This helps prevent overheating of the wire and reduces the risk of tripping circuit breakers or experiencing voltage drops that could adversely affect the performance of the ACU.

In contrast, the smaller ratings such as 3.5 sqmm (20 amps) and 2.0 sqmm (15 amps) may not provide sufficient safety margins, especially under peak load conditions. While they could theoretically function with a 1-hp ACU, they do not account for safety and performance as effectively as the larger 5.0