How must cables in a fire alarm system be supported?

In a fire alarm system, cables must be supported by the building structure to ensure safety and compliance with the National Electrical Code (NEC) requirements. Proper support is critical because it prevents cables from sagging, which could lead to damage or malfunction during an emergency. By securing cables to the structure, the system helps ensure that wiring is protected from physical damage and maintains reliable operation, which is vital for safety in fire emergencies. Additionally, using the building structure for support promotes neat and orderly installations, reduces clutter, and helps prevent tripping hazards.

While other support methods such as cable ties, insulation, and conduits may have their own appropriate applications in electrical installations, they do not provide the necessary secure and long-term support for fire alarm cables as mandated by the NEC. Therefore, the method of attachment to the building structure is the ideal and compliant practice for ensuring the integrity and functionality of fire alarm systems.