For fire protection, wires and cables should have high fire resistance, such as NH-YJV (fire-resistant cross-linked polyethylene insulated PVC sheathed cables) to maintain power during a fire . Mineral-insulated (MI) cables or conduits encased in concrete can also be used for two-hour fire-rated protection . The cable cross-section must be calculated to handle the fan's rated current with a margin for overloads .
Fan distribution boxes should be housed in fire-rated enclosures that maintain functionality during a fire. ABB fire protection enclosures, for example, provide 30–90 minutes of fire resistance and include fireproof doors and ventilation systems that close automatically in a fire . Access panels should also be fire-rated to allow safe maintenance without compromising protection .
The fan should be powered from a dedicated fire power supply circuit, separate from non-fire circuits, to ensure priority operation during emergencies . Underground conduits or risers through fire-rated rooms are recommended to avoid costly or impractical above-ceiling installations .
Smoke exhaust fans can be controlled via manual on-site switches, remote fire control room signals, or automatic fire alarm triggers. Fire relays, such as RIB relays, can be used to disconnect non-essential loads and ensure the fan operates during a fire . Proper labeling and wiring of normally open and normally closed contacts are essential for correct operation.
To ensure fire protection for fan distribution boxes:
Automatic control starts the smoke exhaust fan automatically according to the signals of the fire detectors. - **Line
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