What is the common color for AC control conductors?

The common color for AC control conductors is red. This designation is widely used in electrical systems to help identify the conductor's function, especially in control circuits for air conditioning and various other HVAC equipment. Red conductors are typically employed to connect various control switches, relays, and devices within the system, ensuring a clear distinction from power conductors, which may use different color codes.

Using red for AC control conductors helps streamline installation, maintenance, and troubleshooting processes, as technicians can quickly recognize which wires are intended for control signals. This color coding practice increases safety by reducing the likelihood of confusion that may arise from using similar colors for different purposes in an electrical system.