SIST EN 81-21:2009
(Main)Safety rules for the construction and installation of lifts - Lifts for the transport of persons and goods - Part 21: New passenger and goods passenger lifts in existing builiding
Safety rules for the construction and installation of lifts - Lifts for the transport of persons and goods - Part 21: New passenger and goods passenger lifts in existing builiding
This European Standard specifies the safety rules related to new passenger- and goods/passenger lifts permanently installed in existing buildings where in some circumstances due to limitations enforced by building constraints, some requirements of EN 81-1 and EN 81-2 cannot be met (see also 3rd sentence of Introduction).
This European Standard addresses a number of these constraints and gives requirements for alternative solutions. It shall be read and applied in conjunction with the European Standards EN 81-1 or EN 81-2 and their amendments A1:2005 and A2:2004, including their Clause 0.
This European Standard covers:
- Either the construction and installation of one or more complete new lift(s) in an existing building; or
- The replacement of one or more existing lift(s) by new ones in existing well(s) and machinery spaces.
This European Standard does not cover:
- Replacement or modifications of some parts to a lift already installed;
- Other applications outside of the scope of EN 81-1 or EN 81-2.
Sicherheitsregeln für die Konstruktion und den Einbau von Aufzügen - Aufzüge für den Personen- und Gütertransport - Teil 21: Neue Personen- und Lastenaufzüge in bestehenden Gebäuden
Diese Europäische Norm legt Sicherheitsregeln für neue Personen- und Lastenaufzüge fest, die dauerhaft in bestehende Gebäude eingebaut werden, bei denen in manchen Fällen aufgrund von baulichen Einschränkungen durch bauliche Einschränkungen einige Anforderungen von EN 81 1 und EN 81-2 nicht erfüllt werden können (siehe Einleitung, 3. Satz).
Diese Europäische Norm befasst sich mit einer Anzahl dieser Einschränkungen und nennt Anforderungen für alternative Lösungen. Sie muss in Verbindung mit den Normen EN 81 1 oder EN 81 2 und deren Änderungen A1:2005 und A2:2004, einschließlich ihres Abschnittes 0, verstanden und angewendet werden.
Diese Europäische Norm gilt entweder für:
die konstruktive Ausführung und den Einbau eines oder mehrerer vollständig neuer Aufzüge in ein bestehendes Gebäude; oder
den Austausch eines oder mehrerer vorhandener Aufzüge durch neue in dem (den) vorhandenen Schacht (Schächten) und Aufstellungsorten für Triebwerk und Steuerung.
Diese Europäische Norm gilt nicht für:
den Austausch oder die Änderungen einzelner Teile eines bereits errichteten Aufzuges;
andere Anwendungen außerhalb des Anwendungsbereichs der EN 81 1 oder EN 81 2.
Règles de sécurité pour la construction et l'installation des élévateurs - Elévateur pour le transport de personnes et d'objets - Partie 21 : Ascenseurs et ascenseurs de charge neufs dans les bâtiments existants
La présente Norme européenne spécifie les règles de sécurité relatives aux ascenseurs et ascenseurs de charge installés de manière permanente dans des bâtiments existants, où, dans certaines circonstances, certaines prescriptions de l’EN 81-1 et de l’EN 81-2 ne peuvent pas être respectées en raison de limitations dues à des contraintes de construction (voir aussi la 4ème phrase de l’Introduction).
La présente Norme européenne donne la liste de quelques-unes de ces contraintes et fournit des prescriptions pour des solutions alternatives. Elle doit être lue et appliquée conjointement avec les Normes européennes EN 81-1 ou EN 81-2 et leurs amendements A1:2005 et A2:2004, y compris leur Article 0.
La présente Norme européenne couvre :
- soit la construction et l’installation d’un ou de plusieurs ascenseurs neufs complets, y compris les gaines et les emplacements de machinerie neufs, dans un bâtiment existant ;
- soit le remplacement d’un ou de plusieurs ascenseurs existants par de nouveaux dans des gaines et emplacements de machinerie existants.
La présente Norme européenne ne couvre pas :
- le remplacement ou les modifications de quelques pièces d’un ascenseur déjà installé ;
- toute autre application en dehors du domaine d’application de l’EN 81-1 ou de l’EN 81-2.
Varnostna pravila za konstruiranje in vgradnjo dvigal (liftov) - Dvigala za prevoz oseb in blaga - 21. del: Nova osebna in tovorno-osebna dvigala v obstoječih stavbah
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.REVWRMHþLKVWDYEDKSicherheitsregeln für die Konstruktion und den Einbau von Aufzügen - Aufzüge für den Personen- und Gütertransport - Teil 21: Neue Personen- und Lastenaufzüge in bestehenden GebäudenRègles de sécurité pour la construction et l'installation des élévateurs - Elévateur pour le transport de personnes et d'objets - Partie 21 : Ascenseurs et ascenseurs de charge neufs dans les bâtiments existantsSafety rules for the construction and installation of lifts - Lifts for the transport of persons and goods - Part 21: New passenger and goods passenger lifts in existing builiding91.140.90Lifts. EscalatorsICS:Ta slovenski standard je istoveten z:EN 81-21:2009SIST EN 81-21:2009en,fr,de01-december-2009SIST EN 81-21:2009SLOVENSKI
STANDARD
SIST EN 81-21:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 81-21September 2009ICS 91.140.90 English VersionSafety rules for the construction and installation of lifts - Lifts forthe transport of persons and goods - Part 21: New passengerand goods passenger lifts in existing buildingRègles de sécurité pour la construction et l'installation desélévateurs - Elévateurs pour le transport de personnes etd'objets - Partie 21 : Ascenseurs de personnes etascenseurs de charge neufs dans les bâtiments existantsSicherheitsregeln für die Konstruktion und den Einbau vonAufzügen - Aufzüge für den Personen- und Gütertransport -Teil 21: Neue Personen- und Lastenaufzüge inbestehenden GebäudenThis European Standard was approved by CEN on 16 July 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 81-21:2009: ESIST EN 81-21:2009
EN 81-21:2009 (E) 2 Contents Page Foreword .3Introduction .41Scope .52Normative references .53Terms and definitions .64List of significant hazards .75Safety requirements and/or protective measures .85.1Perforate wall of the lift well .85.2Clearances between car, counterweight or balancing weight .85.3Counterweight or balancing weight in a separate well .85.4Pulleys in the well .95.5Reduced top clearances . 105.6Car roof balustrade . 145.7Reduced bottom clearances . 155.8Apron . 195.9Height of machine room . 215.10Height of machine room doors . 215.11Dimensions of trap doors for machine room . 215.12Height of pulley rooms . 225.13Dimensions of trap doors for pulley room . 225.14Height of landing doors . 226Verification of safety requirements and/or protective measures . 226.1Verification table . 226.2Tests before putting the lift into service . 246.3Technical dossier. 247Information for use . 247.1Instructions . 247.2Notices and warnings . 25Annex A (normative)
List of the electric safety devices . 27Annex B (informative)
Periodical examinations and tests, examinations and tests after an important modification or after an accident . 28B.1Periodical examinations and tests . 28B.2Examinations and tests after an important modification or after an accident . 28Annex C (normative)
Examination of pre-triggered stopping system . 29C.1General provisions . 29C.2Statement and test samples . 29C.3Laboratory tests . 30C.3.1Method of test . 30C.3.2Determination of the nominal braking force of the stopping gear . 30C.3.3Checking after the tests . 30C.4Calculation . 31C.4.1Calculation method. 31C.4.2Site test case . 31C.4.3Worst cases . 31Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 95/16/EC . 33Bibliography . 34 SIST EN 81-21:2009
EN 81-21:2009 (E) 3 Foreword This document (EN 81-21:2009) has been prepared by Technical Committee CEN/TC 10 “Passenger lifts, escalators and moving walks”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2010, and conflicting national standards shall be withdrawn at the latest by March 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. This standard is part of the EN 81 series of standards “Safety rules for the construction and installation of lifts”. This is the first edition. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 81-21:2009
EN 81-21:2009 (E) 4 Introduction This document is a type C standard as stated in EN ISO 12100. When provisions of this type C standard are different from those stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this document. Where one or several requirements in EN 81-1 or EN 81-2, and their amendments A1:2005 and A2:2004, cannot be fulfilled, due to reasons such as the constraints of the structure of the existing building, the corresponding requirements in this European Standard apply. According to section 2.2 of Annex I to the Lifts Directive, the application of alternative measures to prevent the risk of crushing above and underneath the lift car is restricted to installations where the requirement for free space or refuge is impossible to fulfil and may be subject to prior approval by national authorities. The main concern dealt with in this standard is the reduction of top and pit clearances that may be required due to site conditions. The adopted principle of safety is based on two levels of achievement: first by means of an electrical stopping of the lift car, then by means of a mechanical stopping of the lift car. When drafting this standard, it has been considered for reduced overhead and pit the following: a) Risk reduction measures that rely solely on operations in compliance with procedures are considered as not acceptable, except in a few situations in which mistake-proof solutions are not available (e.g. some activities in repair and installation in which safety devices cannot be operational); b) The risk reduction measures shall be automatically (without any intervention) activated, or may be manually activated if mistake-proof-by-design, or a combination of both is used. SIST EN 81-21:2009
EN 81-21:2009 (E) 5 1 Scope This European Standard specifies the safety rules related to new passenger and goods/passenger lifts permanently installed in existing buildings where in some circumstances due to limitations enforced by building constraints, some requirements of EN 81-1 and EN 81-2 cannot be met (see also 4th sentence of Introduction). This European Standard addresses a number of these constraints and gives requirements for alternative solutions. It shall be read and applied in conjunction with the European Standards EN 81-1 or EN 81-2 and their amendments A1:2005 and A2:2004, including their Clause 0. This European Standard covers: Either the construction and installation of one or more complete new lift(s) including new well and machinery spaces in an existing building; or The replacement of one or more existing lift(s) by new ones in existing well(s) and machinery spaces. This European Standard does not cover: Replacement or modifications of some parts to a lift already installed; Other applications outside of the scope of EN 81-1 or EN 81-2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 81-1:1998, Safety rules for the construction and installation of lifts — Part 1: Electric lifts EN 81-1/A1:2005, Safety rules for the construction and installation of lifts — Part 1: Electric lifts EN 81-1/A2:2004, Safety rules for the construction and installation of lifts — Part 1: Electric lifts — A2: Machinery and pulley spaces EN 81-2:1998, Safety rules for the construction and installation of lifts — Part 2: Hydraulic lifts EN 81-2/A1:2005, Safety rules for the construction and installation of lifts — Part 2: Hydraulic lifts EN 81-2/A2:2004, Safety rules for the construction and installation of lifts — Part 2: Hydraulic lifts — A2: Machinery and pulley spaces EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic terminology, methodology (ISO 12100-1:2003) EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2:Technical principles (ISO 12100-2:2003) ISO 3864-1:2002, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety signs in workplaces and public areas SIST EN 81-21:2009
EN 81-21:2009 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 and
EN 81-1:1998 and EN 81-2:1998 and the following apply. 3.1 existing building building, which is used or was already used before the order for the lift was placed NOTE A building whose internal structure is completely renewed is considered as a new building. 3.2 movable stop mechanical device that under normal operation allows the free movement of the lift between normal terminal stops NOTE Where a person enters on the car roof or in the pit, the device limits the travel of the car to ensure sufficient safety space in the headroom or in the pit. 3.3 triggering device device for operating a stopping gear by a mechanical linkage when the lift car passes a predetermined position in the well NOTE This device is actuated when a door/trap door giving access to the lift well is open by means of a key. 3.4 stopping gear mechanical device for stopping, and maintaining stationary the lift car in the case of unintended movement of the lift car above and/or below a predetermined position in the well to protect person(s) on the car roof and/or in the pit 3.5 pre-triggered stopping system system including the triggering device, the mechanical stopping gear and a mechanical linkage in between NOTE Under normal operation of the lift the system allows the free movement of the lift between normal terminal stops. Where a person enters on the car roof or in the pit the system ensures sufficient safety space in the headroom or in the pit SIST EN 81-21:2009
EN 81-21:2009 (E) 7
4 List of significant hazards This clause contains all the significant hazards, hazardous situations and events, as far as they are dealt with in this standard, identified by risk assessment as significant for this type of machinery and which require action to eliminate or reduce the risk (See Table 1). Table 1 — List of significant hazards No Hazards as listed in Annex A of EN ISO 14121-1 Relevant clauses
1
Mechanical hazards due to: - Machine parts or work pieces, e.g.: - Accumulation of energy inside the machinery, e.g.: .
Crushing hazard 5.5, 5.7 Shearing hazard 5.1 a), 5.3.1 Entanglement hazard 5.4 a) Drawing-in or trapping hazard 5.5.3, 5.7.3 Impact hazard 5.2, 5.3.2, 5.4 b), 5.9, 5.10, 5.11, 5.12, 5.13, 5.14 Slip, trip and fall of persons (related to machinery) 5.1 b), 5.3.1, 5.8 - Uncontrolled amplitude of movements 5.2, 5.3.2 - From insufficient mechanical strength of parts 5.4 b), 5.5.2.2.2 d), 5.6.2 a), 5.7.2.2.3 d), 5.8.1 c) - From inadequate design of pulleys, drums 5.4 b) - Falling of person from person carrier 5.4 c), 5.6, 5.8 a) 2), 5.8 b) 2) 8
Hazards generated by neglecting ergonomic principles in machinery design as, e.g. hazards from:
Access 5.3.1 d), 5.4 c), 5.9, 5.10, 5.11, 5.12, 5.13, 5.14 Inadequate local lighting 5.3.1 h), 5.3.1 i) Unhealthy postures 5.5 Human error, human behaviour 5.5.4, 5.7.4, 7.2 From abnormal conditions of assembly / testing / use / maintenance 5.3, 5.5, 5.6, 5.7, 5.8 9
Hazards associated with the environment in which the machine is used
Failure of the power supply 5.5.2.4.1, 5.5.3.1, 5.5.3.2.2, 5.7.2.4.1, 5.7.3.1, 5.7.3.2.2 Failure of the control circuit 5.5, 5.7 Unexpected start-up, unexpected overrun / overspeed
(or any similar malfunction) from;
- Restoration of energy supply after an interruption 5.5.4, 5.7.4
SIST EN 81-21:2009
EN 81-21:2009 (E) 8 5 Safety requirements and/or protective measures Lifts within the scope of this standard shall comply with the relevant safety requirements and/or protective measures of this clause where one or several requirements in EN 81-1 or EN 81-2, and their amendments A1:2005 and A2:2004, cannot be fulfilled. In addition, the lift shall be designed according to the principles of EN ISO 12100 for relevant but not significant hazards, which are not dealt with by this standard. 5.1 Perforate wall of the lift well The requirements of EN 81-1:1998 and EN 81-2, 5.2.1 are completed by the following: Any existing well enclosure may be perforate provided that: a) EN ISO 13857, clause 4.2.4.2 is fulfilled; and b) A protective imperforate screen shall be provided around the landing door locking devices in order to prevent any manipulation of the locking devices by means of a rigid rod 0,30 m long. NOTE 1 National regulations for the preservation of historical buildings may require the retention of an existing perforate enclosure. NOTE 2 For lifts, which might be subject to vandalism, see EN 81-71, 5.1.1. 5.2 Clearances between car, counterweight or balancing weight The requirements of EN 81-1:1998 and EN 81-2, 11.3 may be replaced by the following: The car and its associated components shall be at a distance of at least 25 mm from the counterweight or balancing weight (if there is one) and its associated components. To avoid any impact between the car (and its associated components) and the counterweight or balancing weight (and its associated components), in case of failure of normal guidance, emergency guidance on the car and counterweight shall be provided to maintain the car and the counterweight in their horizontal position. 5.3 Counterweight or balancing weight in a separate well The counterweight or the balancing weight may be installed in a separate well than the car, provided that the configuration on site does not permit the installation of a lift having an available car area sufficient to fulfil the transport needs. NOTE The standard covers only the installation of one counterweight (or balancing weight) in its own well. The following shall be met. 5.3.1 Counterweight or balancing weight well provisions The requirements of EN 81-1:1998, and EN 81-2, 5.1.2 are supplemented as follows: In case of a separate well for the counterweight/balancing weight the following applies: a) All requirements related to the totally enclosed well (EN 81-1:1998 and EN 81-2, 5.2 and 5.3) shall be fulfilled for the well of the counterweight/balancing weight; b) Inspection traps shall be provided at both ends of the separate well and between them where they are necessary to allow safe maintenance and examinations of the well equipment; they shall comply with EN 81-1:1998 and EN 81-2, 5.2.2; SIST EN 81-21:2009
EN 81-21:2009 (E) 9 c) The distance between inspection traps and equipment requiring maintenance or inspection shall not exceed 0,7 m; d) Where a safety gear is installed at the counterweight/balancing weight, inspection traps shall be provided for the full length of the travel path; e) Stopping device(s) accessible on opening the inspection traps at both ends of the separate well shall be provided, in conformity with the requirements of EN 81-1:1998 and EN 81-2, 14.2.2 and 15.7; f) Electric socket outlet as defined in EN 81-1:1998 and EN 81-2, 13.6.2 shall be provided at the opening of the inspection trap on both ends of the separate well, inside the well; g) The separate well shall be exclusively used for the lift in compliance with EN 81-1:1998 and EN 81-2, 5.8; h) The separate well shall be provided with permanently installed electric lighting, giving an intensity of at least 50 lux on the equipment requiring maintenance/inspection; i) Means to switch the separate well lighting shall be provided on opening the inspection trap on the lower end of the well. 5.3.2 Guiding of the counterweight or balancing weight
The requirements of EN 81-1:1998 and EN 81-2, 10.2 are supplemented as follows: When travelling in a separate well, the counterweight or the balancing weight may be guided by ropes or by the shape of the counterweight or the balancing weight and its well enclosure. If the counterweight or balancing weight is resting on its buffers it shall be kept in a substantially upright position by the use of a small distance to the well enclosure or an emergency guiding. Provisions shall be made so as to avoid the counterweight or the balancing weight to rotate, e.g. by using equal number of left and right twisted suspension ropes. Where its shape guides the counterweight or balancing weight, the enclosure of the well shall be continuous and flush without any protrusion from which the counterweight or the balancing weight can be blocked. The well enclosure shall be covered by durable material. In case of ropes as guiding elements a minimum number of 4 ropes shall be used. Springs or weights shall tighten the ropes. The horizontal free distance between the counterweight or the balancing weight and the well enclosure shall be at least 50 mm if the enclosure of the well is continuous and flush otherwise it shall be increased by 2 mm for each meter of distance between the fixations of the ropes. 5.4 Pulleys in the well The requirements of EN 81-1:1998/A2:2004 and EN 81-2/A2:2004, 6.7.2 may be replaced by the following: Diverter pulleys may be installed in the headroom of the well within the projection of the car roof provided that: a) The diverter pulleys shall be protected according to EN 81-1:1998, 9.7 or EN 81-2, 9.4; b) Retaining devices shall prevent diverter pulleys from falling in the event of a mechanical failure of the pulley, shaft or bearings. The devices shall be able to support the weight of the pulley and the suspended loads; c) Examinations and tests and maintenance operations can be carried out in complete safety from the car roof, from inside the car, from a platform or from outside of the well; d) Clearances in the headroom shall comply with EN 81-1:1998 or EN 81-2, 5.7 or the requirements of 5.5. SIST EN 81-21:2009
EN 81-21:2009 (E) 10 5.5 Reduced top clearances
EN 81-1:1998, Annex K does not apply. The requirements of EN 81-1:1998, 5.7.1.1 b), c) and d), EN 81-1:1998, 5.7.2.2 and EN 81-2, 5.7.1.1 b), c) and d) may be replaced by the following: 5.5.1 General The lift shall be equipped with devices providing safety spaces in the headroom (5.5.2) and a safety system (5.5.3) controlling the operation of the lift. 5.5.2 Devices providing safety spaces in the headroom The devices providing safety spaces in the headroom shall be: a) Either movable stops; or b) A pre-triggered stopping system. 5.5.2.1 Movable stops Automatically operated movable stops shall be designed to prevent damage due to any collision when they are moved between the fully retracted and extended position. 5.5.2.1.1 Arrangement 5.5.2.1.1.1 In the case of traction drive lifts the movable stops shall be installed under the counterweight to mechanically stop the car. 5.5.2.1.1.2 In the case of positive drive lifts the movable stops shall be installed above the car to mechanically stop the car. 5.5.2.1.1.3 In the case of hydraulic lifts the movable stops shall consist of one or more devices external to the jack situated outside of the car projection, the resultant force of which is exerted on the centre line of the jack. 5.5.2.1.2 Buffering of movable stops 5.5.2.1.2.1 In the case of traction and positive drive lifts the movable stops shall be fitted with buffers complying with EN 81-1:1998, 10.3 and 10.4. 5.5.2.1.2.2 In the case of hydraulic lifts the design of the movable stops shall be such that the average retardation of the car does not exceed 1 gn and that in case of an indirect acting lift the retardation does not result in slack rope or chain. 5.5.2.2 Pre-triggered stopping system The pre-triggered stopping system shall include a triggering device with its actuation means for tripping a mechanical stopping gear by a linkage when the car reaches a fixed tripping point in the up direction. 5.5.2.2.1 The triggering device shall be easily accessible so that examinations and maintenance operations can be carried out in complete safety from the pit, or from the car roof or from outside of the well. 5.5.2.2.2 The pre-triggered stopping system shall comply with the following: a) The stopping gear shall be fixed on the car and act on the guide rails of the car; SIST EN 81-21:2009
EN 81-21:2009 (E) 11 b) The stopping gear shall be tripped by a mechanical triggering device using a mechanical linkage for the tripping operation; c) The stopping gear shall be kept tripped by the triggering device and the linkage when the car is at any position above the tripping point; In case of a release of the stopping gear due to dynamic effects or rescue operations it shall be re-engaged when the car moves again in up direction above the tripping point keeping the required safety space; d) The stopping gear shall be operated positively: 1) Where springs are used they shall act by compression; 2) Where a rope is used the safety factor of the rope shall be in accordance with EN 81-1:1998, 9.9.6.2 and EN 81-2, 9.10.6.2; e) The force required to activate the stopping gear shall be at least the greater of the following two values: 1) twice the engagement force of the stopping gear taking into consideration the tolerances due to friction; 2) 300 N; f) The stopping gear shall operate an electric safety device in conformity with EN 81-1:1998 and EN 81-2, 14.1.2, if it is engaged; g) When the stopping gear has been tripped its release shall require the intervention of a competent person; h) After the release, the stopping gear shall be in a condition to operate; i) The pre-triggered device shall be protected against the accidental insertion of objects, dirt and corrosion; j) The pre-triggered stopping system shall be able to stop the car and keep it stopped from any speed between zero and the tripping speed of the ascending car overspeed protections means; k) The maximum retardation by the stopping gear shall not exceed 1 gn in the worst condition as validated according to Annex C; l) When the stopping gear operates, the floor of the car with or without the load uniformly distributed shall not incline more than 5 % from its normal position; m) The pre-triggered stopping system shall be designed and verified according to the requirements in Annex
C.
SIST EN 81-21:2009
EN 81-21:2009 (E) 12 5.5.2.3 Clearances When the buffering parts of the movable stops are fully compressed or when the car is stopped by the pre-triggered stopping system (see Annex C), the following conditions shall be satisfied at the same time: a) The free vertical distance between the
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