This standard specifies the safety rules for the construction and installation of special evacuation lifts intended for use by persons with disabilities during an emergency. It outlines supplementary requirements to standard passenger lifts, focusing on fire protection of the lift well and lobbies, secondary power supply, two-way communication systems, and specific car dimensions to ensure safe evacuation.
Specifies design rules, calculations, examinations and test methods for lift components.
Quick Reference Values
Minimum internal car width1100 mm
Minimum internal car depth2100 mm
Minimum clear door opening width900 mm
Maximum changeover time to secondary power supply60 s
Minimum duration of secondary power supply2 h
Minimum fire resistance rating for lift landing doors60 min
Key Formulas
Safety Factor (SF) = P / S — Where P is the minimum breaking load of one rope and S is the maximum force in one rope.
Buckling Check for Guide Rails: σk = Fk / A ≤ σperm — Where σk is the compression stress due to buckling and Fk is the vertical force on the guide rail.
Buffer Stroke Calculation (Energy Dissipation): S ≥ (0.0674 * v^2) + 0.035 — Where S is the stroke in meters and v is the striking speed in m/s.
Overspeed Governor Tripping Speed: v1 ≤ v + (0.25 + 3/v) — Where v1 is the tripping speed and v is the rated speed (for v > 4 m/s).
Practical Notes
This standard is crucial for high-rise buildings and must be read in conjunction with the National Building Code (Part 4: Fire and Life Safety).
The evacuation lift is distinct from a 'Fireman's Lift', though they can be a combined unit if all requirements of both standards are met.
Effective implementation requires close coordination between the architect, fire consultant, MEP engineer, and the lift manufacturer to ensure all protective measures and system interfaces are correctly designed and installed.