Code of Practice for Safe Use and Operation of Suspended Working ...

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5.10 Brakes5.10.1 Each winch, climber or other lifting appliance or similar device of thesuspended working platform should be provided with the following brakingsystem:(a)(b)in case of manually operated appliances or devices, an efficient brakewhich comes into operation when the operating handle or lever isreleased; andin case of power operated appliances or devices, two independentefficient braking systems, i.e. the primary brake and the secondarybrake capable of preventing the suspended working platform fromfalling out of control or in a dangerous manner (regulation 11 of theSWPR).5.10.2 Where a temporary suspended working platform is raised or lowered bya manually operated hoist, the hoist should be designed to have:(a)(b)(c)a positive crank force to lift and lower the load. The maximum forceapplied to the end of the crank or cranks for lifting the rated capacityof the hoist should not exceed 250N;an interlocking device must be provided to prevent the release ofthe gripping mechanism when the suspension wire rope is under aload above 2% of the maximum safe working load; anda means to prevent rapid handle movement, fast unreeling oruncontrolled descent.5.10.3 The primary brake should :(a)(b)(c)(d)engage automatically in the event of power failure or interruption;be capable of stopping and sustaining the working platform evenwhen the working platform is overloaded by 25%:be directly coupled to the drive train of the appliance or climbingdevice and not by using belts, pins, clutches, roller chain or rollers;andbe capable of being released manually in the event of a power failureor emergency. The means of releasing the brake should ensure itsimmediate reapplication as soon as the control is released.33
5.10.4 The secondary brake should be mechanically operated independently ofthe primary brake. It should be capable of arresting and sustaining theworking platform if the primary braking system fails and in the event ofoverspeeding of the working platform.5.10.5 Each climbing device should be provided with an automatic emergencytype secondary brake that could stop and hold 125 % of the rated load ofthe climbing device. If such a secondary brake is of the instantaneousstopping type, it should stop and hold its total load before the devicetravels a vertical distance of 450 mm. If such a secondary brake is of thedeceleration type, it should stop and hold its total load before the devicetravels a vertical distance of 1.2 m.5.10.6 Secondary brakes should be independent of the drive trains on all climbingdevices. In normal operation, such a brake should not engage before thedevice is stopped by the primary brake.5.11 Control Levers, Switches5.11.1 Every lever, handle, switch, or other device used for controlling theoperation of any part of the suspended working platform (being a lever,handle, switch, or other device the accidental movement or displacementof which is liable to cause danger ) should be, unless it is so placed as toprevent accidental movement or displacement, provided with a suitablespring or other locking arrangement to prevent any such accidentalmovement or displacement (regulation 12(a) of the SWPR).5.11.2 Every lever, handle, switch, or other device for controlling the operationof any part of the suspended working platform should have either on oradjacent to it clear markings to indicate its purpose and mode of operation(regulation 12(b) of the SWPR).5.11.3 The control for the power unit and hence the climbing device should besuch that when manual application is released, the power unit will stop.5.11.4 Emergency stop device should be located at each operator control stationand other places where emergency stop may be required. It should beoperative irrespective of whether the control station is in operation. Thedevice should be in red colour.34
Page 1 and 2: Code of Practice forSafe Use and Op
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Page 9 and 10: Competent personA competent person,
Page 11 and 12: Registered professional engineerA r
Page 13 and 14: 3. DESCRIPTION3.1 This Code specifi
Page 15 and 16: 4. MANAGEMENT OF SAFE OPERATION OFT
Page 17 and 18: (e)(f)(g)(h)(i)(j)(k)the suspended
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Page 29 and 30: 5.4 Stability Against Overturning5.
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Page 33 and 34: 5.6.8 Adequate arrangements (e.g. t
Page 35: 5.8.3 If the rope is to be wound on
Page 39 and 40: 5.13.5 The place where persons acce
Page 41 and 42: 6. SAFE AND PROPER USE6.1 Erection,
Page 43: 6.3 Safety Belt and Lifeline6.3.1 E
Page 46 and 47: 6.5 Marking of Safe Working Load an
Page 48 and 49: 6.7.1.3 The working platforms shoul
Page 50 and 51: 7.2 Wire Ropes7.2.1 All ropes shoul
Page 52 and 53: 8.1.5 During the inspection, functi
Page 54 and 55: 8.2.13 Functional tests of the foll
Page 56 and 57: 8.4 Display and Keeping of Certific
Page 58 and 59: (c)(d)(e)(f)(g)in case of a tempora
Page 60 and 61: 14. Guidance note on classification
Page 62: Occupational Safety and Health Bran

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