BS 5900:1991 download free.Specification for powered domestic lifts.
1.1 Scope
BS 5900 specifies requirements for the design, construction and installation of powered domestic lifts, which are designed for use by persons with impaired mobility travelling between fixed floor levels in private dwellings.
BS 5900 also specifies the minimum safety provisions relating to the operation and maintenance of these lifts to safeguard against the risk of accidents associated with the operation of this equipment.
BS 5900 specifies requirements for five types of lifts that travel a maximum vertical distance of 12 m, and that have either a totally enclosed car or a partially enclosed car and that are either suspended by ropes or chains or driven by hydraulic machinery.
In addition to stating the responsibilities of the manufacturer, BS 5900 also details information to be provided on special features and actions, given in 1.3.4. 1.4. and 8.2 and supported by guidance to the purchaser given in Appendix A.
NOTE The titles of the publications referred to in BS 5900 are listed on the inside back cover.
1.2 Definitions
For the purposes of this British Standard the following definitions apply.
1.2.1
approach ramp
a hinged flat surface, attached to the car, that, when lowered, provides access to the car and, when raised. restrains a wheelchair
1.2.2
authorized person
an individual who has:
a) undergone such training and has sufficient knowledge and experience of the relevant type of lift to enable him to recognize potential danger of such a lift; or
b) been instructed on the specific task assigned to him and in the avoidance of any potential hazards of it, and who, if necessary has been given a degree of training relevant to that task.
1.2.3
barrier
a device comprising a bar, or assembly of similar elements, so arranged as to protect the car entrance
1.2.4
brake
an electromechanical mechanism employed to bring the car to rest and hold it in this position
1.2.5
buffer
a resilient stop at the end of the travel of the car or counterweight
1.2.6
car
the load-carrying unit complete with its platform, frame attachments and car enclosure
1.2.7
car enclosure
the enclosing bodywork of the car
1.2.8
chain
a transmission chain that, if used as part of a drive system, either transmits rotary motion from one shaft to another or transmits motion directly to the car and/or counterweight
1.2.9
chainwheel
a wheel having machine-cut teeth designed to engage with a chain
1.2.10
car top clearance
the minimum vertical clear distance between the highest point of the car and its equipment and the lowest point of any roof, floor, overhead beam or other overhead obstruction within the lift well
1.2.11
car bottom clearance
the minimum vertical clear distance within the lift well between the pit floor, or ground floor if a pit is not provided, and the lowest point of the car frame, when the car rests on its fully compressed buffers or is at ground floor level, whichever is appropriate
1.2.12
contactor
an electromagnetically operated device of suitable rating for switching a mains electrical power circuit
1.2.13
control devices
manually operated switches, push-buttons or other devices used to control the lift
1.2.14
controller
an assembly of electrical contactors, relays andlor other components, mounted within a cabinet, for controlling the lift
3.1 General safety factor The requirements of 2.1 shall apply.
3.2 Lift well enclosure
3.2.1 General
The requirements of 2.2.1 shall apply.
In addition protection shall be provided against all potential trapping hazards arising from the car, counterweight (if fitted), their guides, fixings, etc.
3.2.2 Lighting of the lift well The requirements of 2.2.2 shall apply.
3.2.3 Lift well without enclosure at lowest level
3.2.3.1 The lift well enclosure shall comply with that specified in 2.2.3 except that it is omitted at the lowest floor served. A sensitive surface shall be fitted to, and fully protect, the complete underside of the car platform to prevent trapping between the surfaces of the platform, car and lowest floor. The force required to actuate this device shall not exceed 20 N, applied anywhere on its total surface.
This surface shall, when the Lift car is at its uppermost level, create a minimum ‘/ h fire seal between itself and the ceiling of the lower floor.
3.2.3.2 The opening in the lift well between the top of the car and the underside of the ceiling shall be fully protected by sensitive edges fitted to the upper periphery of the car. The force required to actuate these devices shall not exceed 20 N applied anywhere along their length.
3.2.3.3 The operation of the sensitive surface (3.2.3.1) shall be arranged to stop the lift car in the downward direction.
3.2.3.4 The operation of the sensitive surface (3.2.3.1) and all sensitive edges (3.2.3.2) shall operate a safety switch(es) and initiate a break in the electrical supply to the motor and brake, stop the car and prevent any further movement of the car towards the obstruction. It shall be possible after the delay specified in 1.5.4.7 to drive the car away in the opposite direction to clear the obstruction.
3.2.3.5 The car shall come to rest within a distance of 20 mm from the point of making first contact with the obstacle; there shall also be follow-through to prevent injury.
3.2.3.6 Means shall be provided to avoid the hazards of trapping caused by the movement of sensitive edges and)or surfaces.
3.3 Guides and fixings The requirements of 2.3 shall apply.
6.3.3.3 To re-instate the first floor aperture, with the lift car at its lowest level, a travelling infill capable of supporting a load of at least 150 kg spread evenly over its area, shall be provided. This travelling infill shall create a level surface and shall not be removable without the use of special tools.
6.3.3.4 A device that will sense any obstruction on the complete upper side of the travelling infill shall be provided. It shall function in the manner specified in 6.3.3.7 but shall be so arranged as to stop the lift car in the upward direction only.
6.3.3.5 In order to prevent the travelling infihl becoming detached from the car when travelling in the down direction, a device operating in the manner specified in 6.3.3.7 but so arranged as to stop the car in the down direction only, shall be fitted. It is imperative that this device remains effective until the infill is correctly located in the aperture.
6.3.3.6 The opening between the top side of the upper floor and the underside of the travelling infill shall be fully protected by safety devices.
6.3.3.7 The operation of sensitive surfaces, sensitive edges and safety devices shall operate a safety switch(es) and initiate a break in the electrical supply to the motor and brake, stop the car in the direction of travel and prevent any further movement of the car towards the obstruction. It shall be possible after the delay specified in 1.5.4.7 to drive the car away in the opposite direction to clear the obstruction.
6.3.3.8 The operation of the sensitive edges (6.3.3.2) shall function in the manner specified in 6.3.3.7, but shall be so arranged as to stop the lift car in the upward direction only.
6.3.3.9 The operation of the safety devices (6.3.3.6) shall function in the manner specified in 6.3.3.7 but shall be so arranged as to stop the lift car in the downward direction only. These devices may be overridden when the travelling infill is within 20 mm of the surface of the upper floor.
6.3.3.10 When caused to do so by the operation of the sensitive surface or edges, the lift car shall come to rest within a distance of 20 mm from the point of making first contact with the obstacle; there shall also be follow-through to prevent injury.
6.3.3.11 The force required to operate the sensitive surface or edges shall not exceed 20 N when applied anywhere on their protecting surface or edges.
6.3.3.12 Means shall be provided to avoid the hazards of trapping caused by the movement of sensitive edges and/or surfaces.
6.4 Guides and fixings
The requirements of 2.3 shall apply.