2.1 General Terms Relating to Lifts
2.1.1 Automatic Rescue Device (ARD) – A device meant to bring a lift stuck between floors due to loss of power, to the nearest landing level in either direction and open the doors in order to allow trapped passengers to be evacuated. Such a device may use some form of internal auxiliary power source for such purpose, complying with all the safety requirements of the lift during normal run. The speed of travel is usually lower than the normal speed. On reaching the level, in case of manual door lifts, the device shall allow the door to be opened and in case of power operated door lifts the device shall automatically open the door.
2.1.2 Bottom Car Run-by – The distance between the car buffer striker plate and the striking surface of the car buffer when the car is in level with the bottom terminal landing.
2.1.3 Bottom Counterweight Run-by – The distance between the counter weight buffer striker plate and the striking surface of the counterweight buffer when the car is in level with the top terminal landing.
2.1.4 Buffer – A device designed to stop a descending car or counter weight beyond its normal limit of travel by storing or by absorbing and dissipating the kinetic energy of the car or counterweight.
184.108.40.206 Oil buffer – A buffer using oil as a medium which absorbs and dissipates the kinetic energy of the descending car or counterweight.
220.127.116.11.1 Oil buffer stroke – The oil displacing movement of the buffer plunger or piston, excluding the travel of the buffer plunger accelerating device.
18.104.22.168 Spring Buffer – A buffer which stores in a spring the kinetic energy of the descending car or counterweight.
22.214.171.124.1 Spring buffer load rating – The load required to compress the spring by an amount equal to its stroke.
126.96.36.199.2 Spring buffer stroke – The distance, the contact end of the spring can move under a compressive load until the spring is compressed solid.
2.1.5 Call Indicator – A visual and audible device in the car to indicate to the attendant the lift landings from which calls have been made.
2.1.6 Car Bodywork – The enclosing bodywork of the lift car which comprises the sides and roof and is built upon the car platform.
2.1.7 Car Door Electric Contact – An electric device, the function of which is to prevent operation of the driving machine by the normal operating device of the lift unless the car door is in the closed position.
2.1.8 Car Frame – The supporting frame or sling to which the platform of the lift car, its safety gear, guide shoes and suspension ropes are attached.
2.1.9 Car Platform – The part of the lift car which forms the floor and directly supports the load.
188.8.131.52 Bottom car clearance – The clear vertical distance from the pit floor to the lowest structural or mechanical part, equipment or device installed beneath the car platform, except the guide shoes, rollers, safety jaw blocks and platform apron or guard located within 300 mm, measured horizontally from the sides of the car platform when the car rests on its fully compressed buffers.
184.108.40.206 Top car clearance – The shortest vertical distance between the top of the car crosshead, or between the top of the car where no crosshead is provided, and the nearest part of the overhead structure or any other obstruction when the car floor is level with the top terminal landing.
220.127.116.11 Top counterweight clearance – The shortest vertical distance between any part of the counterweight structure and the nearest part of the overhead structure or any other obstruction when the car floor is level with the bottom terminal landing.
2.1.11 Control – The system governing starting, stopping, direction of motion, acceleration, speed and retardation of moving member.
18.104.22.168 Single-speed alternating current control – A control for a driving machine induction motor which is arranged to run at a single-speed.
22.214.171.124 Two-speed alternating current control – A control for a two-speed driving machine induction motor which is arranged to run at two different synchronous speeds either by pole changing of a single motor or by two different armatures.
126.96.36.199 Rheostatic control – A system of control which is accomplished by varying resistance or reactance or both in the armature or field circuit or both of the driving machine motor.
188.8.131.52 Variable voltage motor control (generator field control) – A system of control which is accomplished by the use of an individual generator for each lift wherein the voltage applied to the driving machine motor is adjusted by varying the strength and direction of the generator field.
184.108.40.206 Electronic devices – A system of control which is accomplished by the use of electronic devices for driving the lift motor at variable speed.
220.127.116.11 Alternating current variable voltage (ACVV) control – A system of speed control which is accomplished by varying the driving and braking torque by way of voltage variation of the power supply to the driving machine induction motor.
18.104.22.168 Alternating current variable voltage variable frequency (ACVVVF) control – A system of speed control which is accomplished by varying the voltage and frequency of the power supply to the driving machine induction motor.
22.214.171.124 Solid-State d.c. Variable Voltage Control – A solid-state system of speed control which is accomplished by varying the voltage and direction of the power supply to the armature of driving machine d.c. motor.
2.1.12 Counterweight – A weight or series of weights to counter-balance the weight of the lift car and part of the rated load.
2.1.13 Deflector Sheave – An idler pulley used to change the direction of a rope lead.
2.1.14 Door (Lift Landing Door and Lift Car Door)
126.96.36.199 Door, centre opening sliding – A door which slides horizontally and consists of two or more panels which open from the centre and are usually so interconnected that they move simultaneously.
188.8.131.52 Door, mid-bar collapsible – A collapsible door with vertical bars mounted between the normal vertical members.
184.108.40.206 Door, multi-panel – A door arrangement whereby more than one panel is used such that the panels are connected together and can slide over one another by which means the clear opening can be maximized for a given shaft width. Multi panels are used in centre opening and two speed sliding doors.
220.127.116.11 Door, single slide - A single panel door which slides horizontally.
18.104.22.168 Door, two speed sliding – A door which slides horizontally and consists of two or more panels, one of which moves at twice the speed of the other.
22.214.171.124 Door, vertical bi-parting – A door which slides vertically and consists of two panels or sets of panels that move away from each other to open and are so interconnected that they move simultaneously.
126.96.36.199 Door, vertical lifting – A single panel door, which slides in the same plane vertically up to open.
188.8.131.52 Door, swing – A swinging type single panel door which is opened manually and closed by means of a door closer when released.
2.1.15 Door Closer – A device which automatically closes a manually opened door.
2.1.16 Door Operator – A power-operated device for opening and closing doors.
2.1.17 Dumb Waiter - A lift with a car which moves in guides in a vertical direction; has a net floor area not exceeding 1 m2 , total inside height of 1.2 m, whether or not provided with fixed or removable shelves; has a capacity not exceeding 250 kg and is exclusively used for carrying materials and shall not carry any person.
2.1.18 Electrical and Mechanical Interlock – A device provided to prevent simultaneous operation of both up and down relays or power contactors.
2.1.19 Electro-Mechanical Lock – A device which combines in one unit, electrical contact and a mechanical lock jointly used for the landing and/or car doors.
2.1.20 Floor Leveling Switch – A switch for bringing the car to level at slow speed in case of double speed or variable speed machines.
2.1.21 Floor Selector – A mechanism forming a part of the control equipment, in certain automatic lifts, designed to operate controls which cause the lift car to stop at the required landings.
2.1.22 Floor Stopping Switch – A switch or combination of switches arranged to bring the car to rest automatically at or near any pre-selected landing.
2.1.23 Geared Machine – A machine in which the power is transmitted to the sheave through worm and worm wheel or spur reduction gearing.
2.1.24 Gearless Machine – A lift machine in which the motive power is transmitted to the driving sheave from the motor without intermediate reduction gearing and has the brake drum mounted directly on the motor shaft.
2.1.25 Goods Lift – A lift designed primarily for the transport of goods, but which may carry a lift attendant or other personnel necessary for the loading or unloading of goods.
2.1.26 Guide Rails – The members used to guide the movement of a lift car or counterweight in a vertical direction.
2.1.27 Guide Rails Fixing – The complete assembly comprising the guide rails bracket and its fastenings.
2.1.28 Guide Shoe – An attachment to the car frame or counterweight for the purpose of guiding the lift car or counter weight frame.
2.1.29 Hoisting Beam – A beam, mounted immediately below the machine room ceiling/machinery space ceiling, to which lifting tackle can be fixed for raising or lowering parts of the lift machine.
2.1.30 Hospital Lift – A lift normally installed in a hospital, dispensary or clinic and designed to accommodate one bed or stretcher along its depth, with sufficient space around to carry a minimum of three attendants in addition to the lift operator.
2.1.31 Landing Call Push – A push button fitted at a lift landing, either for calling the lift car, or for actuating the call indicator.
2.1.32 Landing Door – The hinged or sliding portion of a lift well enclosure, controlling access to a lift car at a lift landing.
2.1.33 Landing Zone – A space extending from a horizontal plane 400 mm below a landing level to a plane 400 mm above the landing level.
2.1.34 Levelling Devices
184.108.40.206 Levelling device, lift car – Any mechanism which either automatically or under the control of the operator, moves the car within the levelling zone towards the landing only, and automatically stops it at the landing.
220.127.116.11 Levelling device, one way automatic – A device which corrects the car level only in case of under run of the car but will not maintain the level during loading and unloading.
18.104.22.168 Levelling device, two-way automatic maintaining – A device which corrects the car level on both under run and over-run and maintains the level during loading and unloading.
22.214.171.124 Levelling device, two way automatic non maintaining – A device which corrects the car level on both under run and over run but will not maintain the level during loading and unloading.
2.1.35 Levelling Zone – The limited distance above or below a lift landing within which the levelling device may cause movement of the car towards the landing.
2.1.36 Lift – An appliance designed to transport persons or materials between two or more levels in a vertical or substantially vertical direction by means of a guided car. The word ‘elevator’ is also synonymously used for ‘lift’.
2.1.37 Lift Car – The load carrying unit with its floor or platform, enclosing bodywork, and car door.
2.1.38 Lift Landing – That portion of a building or structure used for discharge of passengers or goods or both into or from a lift car.
2.1.39 Lift Machine – The part of the lift equipment comprising the motor and the control gear therewith, reduction gear (if any), brake(s) and winding drum or sheave, by which the lift car is raised or lowered.
2.1.40 Lift Pit – The space in the lift well below the level of the lowest lift landing served.
2.1.41 Lift Well – The unobstructed space within an enclosure provided for the vertical movement of the lift car(s) and any counterweight(s), including the lift pit and the space for top clearance.
2.1.42 Lift Well Enclosure – Any structure which separates the lift well from its surroundings.
2.1.43 Operation – The method of actuating the control of lift machine.
126.96.36.199 Automatic operation – A method of operation in which by a momentary activation of a call button the lift car is set in motion and caused to stop automatically at any required lift landing.
188.8.131.52 Non-selective collective automatic operation – Automatic operation by means of one button in the car for each landing level served and one button at each landing, wherein all stops registered by the momentary actuation of landing or car buttons are made irrespective of the number of buttons actuated or of the sequence in which the buttons are actuated. With this type of operation, the car stops at all landings for which buttons have been actuated making the stops in the order in which the landings are reached after the buttons have been actuated but irrespective of its direction of travel.
184.108.40.206 Selective collective automatic operation – Automatic operation by means of one button in the car for each landing level served and by up and down buttons at the landings, wherein all stops registered by the momentary actuation of the car made as defined under non-selective collective automatic operation, but wherein the stops registered by the momentary actuation of the landing buttons are made in the order in which the landings are reached in each direction of travel after the buttons have been actuated. With this type of operation, all `up’ landing calls are answered when the car is travelling in the up direction and all `down’ landing calls are answered when the car is travelling in the down direction, except in the case of the uppermost or lowermost calls which are answered as soon as they are reached irrespective of the direction of travel of the car.
220.127.116.11 Single automatic operation – Automatic operation by means of one button in the car for each landing level served and one button at each landing so arranged that if any car or landing button has been actuated, the actuation of any other car or landing operation button will have no effect on the movement of the car until the response to the first button has been completed.
18.104.22.168 Group automatic operation – Automatic operation of two or more non-attendant lifts equipped with power-operated car and landing doors. The operation of the cars is coordinated by a supervisory operation system including automatic dispatching means whereby selected cars at designated dispatching points automatically close their doors and proceed on their trips in a regulated manner.
Typically, it includes one button in each car for each floor served and up and down buttons at each landing (single buttons at terminal landings). The stops set up by the momentary actuation of the car buttons are made automatically in succession as a car reaches the corresponding landings irrespective of its direction of travel or the sequence in which the buttons are actuated. The stops set up by the momentary actuation of the landing buttons may be accomplished by any lift in the group, and are made automatically by the first available car that approaches the landing in the corresponding direction.
22.214.171.124 Car switch operation – Method of operation by which the movement of lift car is directly under the operation of the attendant by means of a handle.
126.96.36.199 Signal operation – Same as collective operation, except that the closing of the door is initiated by the attendant.
188.8.131.52 Double button (continuous pressure) operation – Operation by means of buttons or switches in the car and at the landings any of which may be used to control the movement of the car as long as the button or switch is manually pressed in the actuating position.
2.1.44 Operating Device – A car switch, push button or other device employed to actuate the control.
2.1.45 Overhead Beams – The members, usually of steel, which immediately support the lift equipment at the top of the lift well.
2.1.46 Over Speed Governor – An automatic device which brings the lift car and/or counter weight to rest by operating the safety gear in the event of the speed in a descending direction exceeding a predetermined limit.
2.1.47 Passenger Lift – A lift designed for the transport of passengers.
2.1.48 Position and/or Direction Indicator – A device which indicates on the lift landing or in the lift car or both, the position of the car in the lift well or the direction in which the lift car is travelling or both.
2.1.49 Rated Load (Lift) – The maximum load for which the lift car is designed and installed to carry safely at its rated speed.
2.1.50 Rated Speed (Lift) – The mean of the maximum speed attained by the lift car in the upward and downward direction with rated load in the lift car.
2.1.51 Retiring Cam – A device which prevents the landing doors from being unlocked by the lift car unless it stops at a landing.
2.1.52 Roping Multiple – A system of roping where, in order to obtain a multiplying factor from the machine to the car, multiple falls of rope are run around sheave on the car or counterweight or both. It includes roping arrangement of 2 to 1, 3 to 1, etc.
2.1.53 Safety Gear – A mechanical device attached to the lift car or counterweight or both, designed to stop and to hold the car or counterweight to the guides in the event of free fall, or, if governor operated, of over-speed in the descending direction. Any anticipated impact force shall be added in the general drawing or layout drawing.
2.1.54 Service Lift – A passenger cum goods lift meant to carry goods along with people.
NOTE ‒ Typically in an office building this may be required to carry food or stationeries, in a residential building to carry luggage or accommodate a stretcher and in a hotel to be used for food trolleys or baggage. There is a need in such lifts, to take care of the dimensions of the car and the door clear opening in line with the type of goods that may have to be carried based on mutual discussion between supplier and customer. Also, such lifts shall have buffer railings in the car at suitable height to prevent damage to the car panels when the goods are transported. Typically such lifts, if provided with an automatic door, may use some means to detect trolleys and stretcher movement in advance to protect the doors against damage. The car floor load calculations and car area of such a lift is as in the case of a passenger lift except that these are not meant to carry heavy concentrated loads.
2.1.55 Sheave – A rope wheel, the rim of which is grooved to receive the suspension ropes but to which the ropes are not rigidly attached and by means of which power is transmitted from the lift machine to the suspension ropes.
2.1.56 Slack Rope Switch – Switch provided to open the control circuit in case of slackening of rope(s).
2.1.57 Suspension Ropes – The ropes by which the car and counter weight are suspended.
2.1.58 Terminal Slow-Down Switch – A switch when actuated shall compulsorily cut off the high speed and switch on the circuitry to run the lift in levelling speed before reaching on terminal landings.
2.1.59 Terminal Stopping Switch Normal – Switch for cutting off all the energizing current in case of car travelling beyond the top or bottom terminal landing or a switch that cuts off the energizing current so as to bring the car to a stop at the top or bottom terminal landing level in the respective direction of travel.
2.1.60 Terminal Stopping Device Final – A device which automatically causes the power to be removed from an electric lift driving machine motor and brake, independent of the functioning of the normal terminal stopping device, the operating device or any emergency terminal stopping device, after the car has passed a terminal landing.
2.1.61 Headroom / Overhead – The vertical distance from the level of the top lift landing to the bottom of the machine room slab.
2.1.62 Travel / Rise – The vertical distance between the bottommost and topmost lift landings served by the lift
2.2 Terms Relating to Performance Requirements for Lifts
2.2.1 A95 – Values of acceleration or vibration within defined boundaries or limits, in which 95 percent of observed values fall. This value is used statistically to estimate typical levels.
2.2.2 Acceleration – Rate of change of z-axis velocity, attributed to lift motion control.
2.2.3 Axis of Measurement – Orthogonal reference axes for the measurements as follows:
X axis – axis perpendicular to the plane of the car front door (that is back to front)
Y axis – axis perpendicular to X and Z (that is side to side)
Z axis – axis perpendicular to the car floor (that is vertical)
2.2.4 Equivalent Sound Pressure Level (LAeq) – Average A-weighted sound pressure level, using frequency weighting A and time weighing 'fast', determined within defined boundaries.
2.2.5 Jerk – Rate of change of z-axis acceleration, attributed to lift motion control. It is expressed in metre per second cube (m/s3).
NOTE – The passenger perception of vertical ride quality during jerk is represented by the assessment of vertical vibration during non-constant acceleration.
2.2.6 Lift Ride Quality – Sound levels in the car, and vibration of the car floor, relevant to passenger perception, associated with lift motion.
2.2.7 Peak to Peak Vibration Levels – Sum of the magnitudes of two peaks of opposite sign separated by a single zero crossing.
2.2.8 Sound – A-weighted sound pressure level measured in decibels (dB).
2.2.9 Sound Pressure Level (Lp,A) – Ten times the logarithm to the base 10 of the ratio of the square of the sound pressure measured (pA) to the square of the reference sound pressure (p0).
Lp,A = 10 log (pA2/p02) db(A)
NOTE – The reference sound pressure level (p0) is 20 µPa (2x10-5 Pa). The measured sound pressure, pA, is in Pascals, using frequency weighting A.
2.2.10 V95 – Value of velocity within defined boundaries or limits, in which 95 percent of observed values fall. This value is used statistically to estimate typical levels.
2.2.11 Velocity – Rate of change of z-axis displacement, attributed to lift motion control.
2.2.12 Vibration – Variation with time of the magnitude of acceleration, when the magnitude is alternately greater and smaller than a reference level. It is expressed in m/s2.
2.3 Terms Relating to Planning and Design of Lifts
2.3.1 Door Closing Time (tc) – Time period measured from the instant that car doors start to close until the doors are locked.
2.3.2 Door Opening Time (to) – Time period measured from the instant that car doors start to open until they are open 800 mm.
2.3.3 Door-to-Door Time (T) – Time period measured from the instant that car doors start to close to the instant that the car doors are open 800 mm at the next adjacent floor.
2.3.4 Handling Capacity (HC) – The number of passengers that a lift system can theoretically transport during the up-peak traffic condition with car occupancy of 80 percent of the actual capacity expressed as a percent of the total building population.
2.3.5 Interval (INT) – Time period between successive car arrivals at the main terminal floor with cars loaded to any value.
2.3.6 Nominal Travel Time (NTT) – The nominal travel time is defined as the time it would take to run a distance of the total travel at the rated speed of the lift without taking into account the acceleration and deceleration of the car or the intermediate stops of real runs.
2.3.7 Passenger Arrival Rate – Percentage of a building’s population arriving within a 5-minute period.
2.3.8 Passenger Average Transfer Time (tp) – Average period of time required for a single passenger to enter or leave the lift car.
2.3.9 Passenger Average Waiting Time (AWT) – Average period of time from the instant a passenger registers a landing call or joins a queue, until the responding lift begins to open its doors at the boarding floor. AWT is not the same as INT.
2.3.10 Round Trip Time (RTT) – The average time taken by a single lift to make a trip from the main terminal back to the main terminal, starting from the time the car doors open at the main terminal until the car doors re-open at the main terminal after serving all demand along the way.
2.3.11 Single Floor Flight Time (tf1) – Period of time measured from the instant that the car doors are locked until the lift is level at the next adjacent floor.
2.3.12 Single Floor Transit Time (tv) – Period of time required to transit two adjacent floors at rated speed.
2.3.13 Sky Lobby – A sky lobby is the main floor for local groups in the upper part of a very tall building.
2.4 Terms Relating to Seismic Operation of Lifts
Snag Point – The point of interference between flexible elements (for example ropes, chains, travelling cable, etc) and fixed elements (for example by guide rail brackets, guide rail clip bolts, fishplates, vanes, and similar devices).
Design Acceleration (ad) – The horizontal acceleration to be used for calculation of forces (moments acting on lift systems and arising from seismic events).
NOTE – The value of (ad) shall be obtained by the lift manufacturer from the building engineer/structural engineer.
Seismic Trigger Level – Seismic acceleration which is used to activate a seismic detection system.
Seismic Mode – Special mode in which the lift operates after detection of seismic trigger level.
Seismic Stand-By Mode – Special mode in which the lift operates after detection of primary earthquake wave without the activation of the seismic detection system.
Normal Operation – Operation mode in which the lift performs when not in seismic mode or in seismic stand-by mode.
Retaining Device – Mechanical device securely fixed to a structural member of the lift car, counterweight frame designed to retain the lift car and counterweight within its guide rails during seismic activity.
2.5 Terms Related to Maintenance of Lifts
2.5.1 Maintenance Organization – Company or part of company where competent maintenance person(s) carry out maintenance operation on behalf of the owner of the installation.
2.5.2 Competent Maintenance Person – Designated person, suitably trained, qualified by knowledge and practical experience, provided with necessary instructions and supported within their maintenance organization to enable the required maintenance operations to be safely carried out.
2.5.3 Manufacturer – Natural and legal person who takes responsibility for the design, manufacture and placing on the market either of safety components for lifts or complete lift.
2.5.4 Installer – Natural or legal person who takes responsibility for the design, manufacture, installation and placing on the market of lifts.
2.5.5 Installation – Completely installed passenger lift or good passenger lift or accessible goods only lift or service lift.
2.1 General Terms Relating to Escalators and Moving Walks
2.1.1 Angle of Inclination – Maximum angle to the horizontal in which the steps, the pallets or the belt move.
2.1.2 Auxiliary Brake – Fail safe brake, which is used to stop an escalators/moving walk under all normal conditions or under certain fault conditions only, typically situated on one side of the main drive shaft.
2.1.3 Balustrade – Part of the escalator/moving walk which ensures the user's safety by providing stability, protecting from moving parts and supporting the handrail.
2.1.4 Balustrade Decking – Transverse member of the balustrade which meets the handrail guidance profile and which forms the top cover of the balustrade.
2.1.5 Brake Load – Load on the step/pallet/belt for which the brake system is designed to stop the escalator/moving walk.
2.1.6 Comb – Pronged section at each landing that meshes with the grooves of the steps
2.1.7 Comb Lighting – Small flush light panels located in the skirt panels on both sides of the escalators/moving walk unit at both upper and lower landing and immediately adjacent to the comb teeth to illuminate the comb and step tread and assist passengers boarding and alighting the escalators/moving walk.
2.1.8 Comb Plate – Platform at each landing to which the combs are attached.
2.1.9 Comb Plate Switch – Switch in safety circuit that opens when excessive force is detected in vertical and/or horizontal direction on the comb or comb plate of escalators/moving walk.
2.1.10 Comb Teeth – Series of teeth which ride the grooves of the escalators/moving walk step tread as the step passes underneath and are designed so as to allow them to break off if a wedging action should occur at their point of contact with step tread.
2.1.11 Emergency Brake – Auxiliary mechanically automatically operated brake, which will stop a fully loaded escalator, if the drive chain breaks.
2.1.12 Emergency Stop Switch – Separate stop button usually located in adjacent walls, columns or within the balustrade providing the facility to stop the escalator/moving walk, in the event of emergency.
2.1.13 Inspection Door – Means of access to equipment areas and other spaces pertaining to an escalators/moving walk installation such as machinery spaces etc. And with access usually restricted to authorized persons.
2.1.14 Safety Devices – Part of a safety circuit consisting of safety switches and/or fail safe circuits.
2.1.15 Escalator – Power-driven, inclined, continuous moving stairway used for raising or lowering persons in which the user carrying surface (for example, steps) remains horizontal.
NOTE – Escalators are machines, and even when out of operation, shall not be considered as fixed staircases as there could be a safety concern.
2.1.16 Exterior Panel – Part of the exterior side of the enclosure of an escalator or moving walk.
2.1.17 Handrail – Power-driven moving rail for persons to grip while using the escalator or moving walk.
2.1.18 Interior Panel – Panel located between the skirting or lower inner decking and the handrail guidance profile or balustrade decking.
2.1.19 Lower Inner Decking – Profile that connects the skirting with the interior panel when they do not meet at a common point.
2.1.20 Lower Outer Decking – Profile that connects the exterior panels with the interior panel.
2.1.21 Machinery – Escalator or moving walk machine(s) mechanisms and associated equipment.
2.1.22 Machinery Spaces – Space(s) inside or outside of the truss where the machinery as a whole or in parts is placed.
2.1.23 Maximum Capacity – Maximum flow of persons that can be achieved under operational conditions.
2.1.24 Moving Walk – Power-driven installation for the conveyance of persons in which the surface carrying the users remains parallel to its direction of motion and is uninterrupted (for example, pallets, belt).
NOTE – Moving walks are machines, and even when out of operation, shall not be considered as fixed access as there could be a safety concern
2.1.25 Newel – End of the balustrade.
2.1.26 Nominal/Rated Speed – Speed in the direction of the moving steps, pallets or the belt stated by the manufacturer for which the escalator or moving walk has been designed, without load on the steps/pallets/belt at nominal frequency and nominal voltage.
2.1.27 Pit – Recess in the floor to receive that portion of the lower landing and the lower end of the incline section which occurs below the floor line when there is no floor under the escalator such as in a basement.
2.1.28 Rated Load – Load which the equipment is designed to move.
2.1.29 Rise (Travel) – Vertical distance between the upper and lower finished floor levels.
2.1.30 Safety Circuit – Part of the electric safety system consisting of electrical safety devices.
2.1.31 Skirting – Vertical part of the balustrade interfacing with the steps, pallets or belt.
2.1.32 Skirt Deflector – Device to minimize the risk of trapping between the step and the skirting.
2.2 Terms Related to Performance Requirements of Escalators and Moving Walks
2.2.1 Load Carrying Unit – Part of an escalator or moving walk designed to carry persons for the purpose of transportation. Example, step, pallet or belt.
2.2.2 Ride Quality – Sound levels and vibration of the steps/pallet, relevant to passenger perception, associated with escalator or moving walk operation.
2.2.3 Acceleration – Rate of change of velocity. It is expressed in m/s2.
2.2.4 Vibration – Variation with time of the magnitude of acceleration. It is expressed in m/s2.
2.2.5 Velocity – rate of change of displacement. Velocity is reported as speed and direction of travel. It is given in metres per second (m/s).
2.2.6 Sound Pressure Level (Lp) – Ten times the logarithm to the base 10 of the ratio of the square of the sound pressure to the square of the reference sound pressure.
NOTE The reference sound pressure level is 20 µPa (2x10-5 Pa).
2.2.7 Equivalent Sound Pressure Level (LpAeq) – Average A-weighted sound pressure level.
2.2.8 Emission Sound Pressure Level (LpA) – A-weighted sound pressure level at the specified positions, excluding the effects of background noise and contribution due to the room characteristics (reverberation) of the in-situ environment. It is expressed in decibels.
2.2.9 Background Noise Correction (K1A) – Correction term to account for the influence of background noise on the emission sound pressure level at the specified positions of the machine under test.
NOTE – The correction in the case of A-weighting is to be determined from A-weighted measured values.
2.2.10 Environmental Indicator (K2A) – Correction term to account for the influence of reflected sound on the emission sound pressure level due the characteristic of the test room.
2.2.11 Measured Speed – Speed of the escalator or moving walk with no load measured at the time of testing after the starting sequence has been completed.