BS EN 81-77:2013 pdf free.Safety rules for the construction and installations of lifts一Particular applications for passenger and goods passenger lifts Lifts subject to seismic conditions.
BS EN 81-77 This European Standard specifies the special provisions and safety rules for passenger and goods passenger lits where these lifts are permanently installed in buildings that are in compliance with EN 1998-1 (Eurocode 8).This standard defines additional requirements to EN 81-1 and EN 81-2.It applies to new passenger lits and goods passenger lifts. However, it may be used as a basis to improve the safety of existing passenger and goods passenger lifts.It does not apply to seismic lift category 0 as defined in Table A.1. This European Standard does not address other risks due to seismic events (for example fire, flood,explosion).For categories 2 and 3 lift the car frame shall be provided at least with upper and lower retaining devices able
to hold the car frame on its guide rails.The retaining devices shall be placed in such a way to distribute loads in a similar way as the guide shoes.The retaining devices shall either be integrated or mounted close to the fixing of the guide shoes.When the car is centre located between the guide rails the clearances d, d2 and ds (Figure 1 a)) between the retaining device and the guide rail shall not exceed 5 mm and the dimensions chosen shall not cause accidental tripping of the safety gear during an earthquake.The depth of the retaining device (z1) shall be limited to avoid collision with guide rail attachments or other fixed devices, but long enough to guarantee a minimum required overlapping length between retaining devices and the guide rail blade during an earthquake. The required depth of the retaining devices is also correlated with the type of guide rail through the allowable deflection of the guide rail (see 5.8.2).
During an earthquake, the minimum required overlapping length between retaining devices and the guide rail blade shall be at least 5 mm (Figure 1 b)). The car structure and retaining devices shall be sufficient to withstand the loads and forces imposed on them including forces generated by the design acceleration (a), without permanent deformation.BS EN 81-77 pdf download.