What color should a label indicating a fault condition be?

The label indicating a fault condition should be red because red is universally recognized as a color that signifies danger or something that requires immediate attention. In the context of fire alarm systems and safety protocols, red labels serve to alert individuals to critical issues or malfunctions that could compromise safety or the functionality of the system. This aligns with standard practices across various emergency systems where the color red indicates an urgent need for investigation or action, ensuring that those responsible for monitoring or responding to the system can quickly identify and address any faults before they escalate into more significant problems.

In contrast, colors like green, yellow, and blue typically indicate other statuses, such as normal operation (green) or caution (yellow), which do not convey the same level of urgency associated with a fault condition.