The four issues that govern the mission effectiveness (installed reliability) of fire alarm systems are the following: Design, Equipment, Installation and Maintenance. Each influences a fire alarm system's overall effectiveness, but after the system is installed, maintenance is the most critical to ensure a reliably operating system. Although much of the fire alarm system is electrically supervised, equipment performance can be affected by building modifications, occupancy changes, device location and orientation, physical damage, improper installation, degree of cleanliness, or other problems.
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