PREN 81-5 : DRAFT 1998

Foreword
1 Scope and field of application
2 Normative references
3 Definitions
4 Units and symbols
5 Lift well
   5.1 General provisions
   5.2 Well enclosure
   5.3 Walls, floor and ceiling of the well
   5.4 Construction of the walls of lift wells and landing doors
         facing a car entrance
   5.5 Protection of any spaces located below the car or the
         balance weight
   5.6 Protection in the well
   5.7 Headroom and pit
   5.8 Exclusive use of the lift well
   5.9 Lighting of the well
   5.10 Emergency release
6 Machinery space and pulley rooms
   6.1 General provisions
   6.2 Access
   6.3 The machinery space
   6.4 Construction and equipment of pulley rooms
7 Landing doors
8 Car and balance weight
   8.12 Trap doors, emergency doors, access doors and access
         panels
9 Suspension, precaution against free fall, descent of the car
   with excessive speed
   9.1 Types of suspension, number of ropes or chains
   9.2 Sheave, pulley and rope diameter ratios - Rope terminations
   9.3 Distribution of load between the ropes or the chains
   9.4 Protection for pulleys and sprockets
   9.5 Precautions against free fall of the car, descent with
         excessive speed
   9.6 Precautions against free fall of the balance weight
   9.7 (Kept free)
   9.8 Safety gear
   9.9 Stopping device
   9.10 Tripping means for safety gears and stopping devices
   9.11 Safety nut
   9.12 Overspeed limiting device
   9.13 Self sustaining characteristics
10 Guide rails, buffers and final limit switch
   10.1 General provisions concerning guide rails
   10.2 Guiding of the car and balance weight
   10.3 Car buffer(s)
   10.4 Stroke of car buffer(s)
   10.5 Final limit switches
11 Clearances between car and wall facing the car entrance, and
   between car and balance weight
12 Lift machine
   12.1 General provision
   12.2 Drive of the car and the balance weight
   12.3 Use of overhung pulleys or sprockets
   12.4 Braking systems
   12.5 Emergency operation
   12.6 Speed
   12.7 Stopping the machine and checking its stopped condition
   12.8 Monitoring the slowdown of the machine when reduced stroke
         buffers are used in accordance with 10.4.3.2
   12.9 Safety devices against slack rope or slack chain for
         indirectly acting lifts
   12.10 Motor run time limiter
   12.11 Protection of machinery
13 Electrical installations and appliances
   13.1 General provisions
   13.2 Contactors, relay-contactors, components of safety circuits
   13.3 Protection of motors and other electrical equipment
   13.4 Main switches
   13.5 Electric wiring
   13.6 Lighting and socket outlets
14 Protection against electrical faults; controls; priorities
   14.1 Failure analysis and electrical safety devices
   14.2 Controls
15 Notices, markings and operating instructions
16 Examinations - Tests - Register - Maintenance
Annex A (normative) - List of the electric safety devices
Annex B (normative) - Unlocking triangle
Annex C (informative) - Technical dossier
Annex D (normative) - Examinations and test before putting into
        service
Annex E (informative) - Periodical examinations and tests,
        examinations and tests after an important modification
        or after an accident
Annex F (normative) - Safety components - Test procedures for
        verification of conformity
Annex G (informative) - Proof of guide rails
Annex H (normative) - Electronic components - Failure exclusion
Annex J (normative) - Pendulum shock test
Annex K (normative) - Calculation of rams, cylinders, rigid
        pipes and fittings
Annex L (normative) - Necessary buffer stroke
Annex M (informative) - Traction evaluation (for overspeed
        governor)
Annex ZA (informative) - Relationship of this European Standard
         with EU Directives

Describes the safety rules for the construction and installation of permanently installed new screw lifts serving defined landing levels.