Specification for powered domestic lifts with partially enclosed cars and no lift

BS 5900:1999 pdf free.Specification for powered domestic lifts with partially enclosed cars and no lift – well encl losures.
5.1 Location
The lift shall be installed in a location where:
a) the floors eaii sI1)port any loa(Ls imlN)S(Nl Ul)Ofl the lift structure or guides, and that the wall can support suitable fixings for the structure, guides and lift well enclosure;
b) an aperture of sufficient size to accommodate the lift can be cut through the upper floor without loss of structural integrity;
c) there is sufficient headroom at the top floor level to accommodate the lift and to house any winding gear aJi(l control eqUi)meflI.
d) the space in front of the lift entrances at each landing served is sufficient to meet the requirement (Iocunwnte(l in accordance with 4a
NOTE The adual ana pruvkkd at earli kuiding %hould allow for Ihi ua(ure of the uaer’s ihsallI1ty and üiclr iieed for pcrconal and iiievhaiiiraI asasIaII(i: w4• B.3.
5.2 Journeys per hour
The lift shall be capable of making the number of
journeys (loculnent e(I in accordance with 4d.
5.3 Motor and gearbox
The thermal time ratings of the motor and gearbox shall be not less 2596. The gearbox wear rating shall ensure a minimum life of 100 000 starts and 2 500 Ii at full load.
5.4 Protection against hazards Protection designed to minimize risk of the following shall be incorporated:
a) shearing, crushing, trapping and abrading;
b) falling;
c) physical shock;
d) electrical shock;
e) fire, attributable to use of the lift.
5.5 Safety factor
Lrnle.ss otherwise stated in this standard, the safety [actor [or all parts of he equipment shall be not less than 3.
5.6 Design and materials
Components shall be designed to take accowit of all static and dynamic loads and forces.
5.7 Electrical supply
The lift shall be powered front a single-phase electrical supply with effective earth connection in accordance with BS 7671:1992, or from a three-phase supply with neutral.
The supply shall Lw dedicated to Ihe lift, and shall originate at the household consumer unit and terminate at a double-pole fused spur conforming to
US 7671:1992.
NOTE The supplier should advise the purchaser concerning suitable positioning of 11w spur.
The electrical supply for the lift shall not include a pre-paynwnt nw(er.
6 Electrical equipment
6.1 General
The electrical specification and constnwtion of the
lift shall conform to US 3456-101:1987 and
BS 3456-201:1990, as appropriate.
6.2 Radio disturbance characteristics The radio disturbance characteristics of the electric motor, contact devices and control devices shall conform to US EN 55014—1:1997. Suppression components shall not be used in any part of the circuit where their failure might cause an unsafe (0fl(lit ion.
6.3 Control and alarm system
6.3.1 All control circuits shall be designed to fall
safe.
NOTE Although the exclusive use of wind (-oflt ml circuits l)toidtt a very high (leflw of safety, it may be necessary to nsort In the use of reflude corarol devk-cs, specially adapted switches and seIaa.nt. Recommendalbons are given in annex C.
6.3.2 Movement of the car shall be controlled by devices located within the ear and at both landing levels. The control station in the car shall consist of the floor-selection control devices, a stop safety switch and an alarm control device. The control station at each landing shall consist of a device to call the car.
NOTE 1 If required, one or more devices may 1w provided at the landing to despatch the tar to the other floor.
NOTE 2 Control devices should take into account any spedlld neetis of the user. See A.33.4 and A.8. I.
NOTE 3 C4unsaderatlon should he given to the provision of an oWofl’ tunible, Iwratr’cI key switch to resttjcl the mase of 11w lift Ii, the intended ILSer (ace A.3.3.4d).
Means shall be provided at each landing to control the car illumination.
6.3.3 The type and position of controls which are to be operated by the user shall conform to the requirement documented in accordance with 4c.
6.3.4 Directional signals shall be self maintained during travel. It shall not be possible to interfere with the lift during travel by the use of any manual control except the“stop” safety switch.
6.3.5 Lifts having a drum drive or chain suspension shall be provided with a slack rope/chain safety switch in accordance with 14.2.
6.3.6 No push-button or switch that can render the door lock circuit ineffective shall be fitted.
6.3.7 Electrical circuits and live components,whether mounted in or on the lift car or in the lift well, shall be enclosed.
6.4 Control circuits
6.4.1 The motor shall be protected by:
a) in the case of electromechanical drives, a cut-out that operates within 10 s of the motor stalling. This cut-out shall be of the manual reset type;
b) in the case of electro- hydraulic drives, a device that offers equivalent protection toa), e.g. a journey timer or winding thermistor.
6.4.2 The control circuit voltage shall not exceed 55 V r.m.s. and shall be derived from the secondary winding of an isolating transformer conforming to BS 3535-1:1990 and BS 3535-2: 1990.One pole of the control circuit voltage supply shall be earthed and the other pole shall be fused as illustrated in Figure la for an ac. supply, or Figure 1b, 1c, or 1d, for a d.c. supply.NOTE Graphical symbols in accordance with BS 3939.
6.4.3 A trailing cable or windmg drum carrying a voltage greater than 55 V above earth shall be protected by a residual current device (RCD) conforming to either uS 4293:1983 or BS 7071:1992, as appropriate. The maximum rated tripping current shall be 30 mA. The maximum trip time at rated tripping current shall be 200 nis. The maximum trip time at 5 times the rated tripping current shall be 40 ms. This RCD shall protect all parts of the installation which are at 240 V. The testing of this RUD shall not cause spurious tripping of any other RCD fitted to the mains supply circuit.
64.4 The main motor and brake control circuit shall have at least two independently operated contacts in series. The circuit shall be designed so that the failure of one of the contacts jwevents operation of the lift not later than the next change of direction.
6.4.5 IsoLation of the electrical supply to stop the drive motor and apply the brake shall not depend upon the closing or maintenance of an electrical control circuit.
6.4.6 There shall be a delay of at least 3 s between the stopping of the lift car and its being restarted in eaher direction.
6.4.7 An earth fault, an open circuit or the discharge or failure of a capacitor shall not give rise to an un.safe condition.
6.5 Relays and contactors
6.5.1 All fixed and moving contacts shall be easy to replace.
6.5.2 Where a pivoted joint of a contactor or relay forms 1ar1 of the circuit, such joints shall be bypassed with a flexible connection having sufficient current capacity.
6.5.3 Contactors having main contacts in juxtaposition shall be separated by an insulating harrier.
6.5.4 Contactors for reversing the direction of travel shall be electrically interlocked.
6.5.5 All contacts on army contactor used for direct control of the electrical supply to the main driving motor shall be linked so that they open or close together, so that, if one contact becomes welded, all are retamne(I in time same position and no contaet ran make in the opposite sense.BS 5900 pdf download.Specification for powered domestic lifts with partially enclosed cars and no lift