If a system does not comply with applicable codes, what color label should be placed on the system?

When a fire alarm system is found to be non-compliant with applicable codes, a yellow label must be placed on the system. This yellow labeling serves as a clear visual indication that the system does not meet the required standards, helping to ensure that technicians, inspectors, and other personnel are aware of the compliance issue. The purpose of this labeling is to promote safety and accountability by alerting users and maintenance staff to potential deficiencies that could affect the system's performance during an emergency.

In this context, the other colors serve different purposes: a red label typically indicates a serious condition that requires immediate attention, revealing that the system is unsafe or requires urgent repair; a blue label may be used for systems that are in service or operational; and a green label generally signifies that a system is compliant and has passed inspections. Each label color is specifically designated to communicate different statuses and ensure proper maintenance and operational efficiency in fire alarm systems.