Safety requirements for cableway installations designed to carry persons - Prevention and fight against fire

This European standard establishes the safety requirements that apply to prevention and fight against fire in cableway installations designed to carry persons.
This standard defines safety principles relating to the prevention of and fight against fires in terms of design, operability and maintainability of cableway installations, and operation and maintenance instructions.
This document supplements the existing standards listed in the foreword exclusively in respect of aspects of fire prevention and firefighting.
This standard does not apply to cableway installations for the transportation of goods nor to lifts.

Sicherheitsanforderungen an Seilbahnen für die Personenbeförderung - Brandverhütung und –bekämpfung

Die vorliegende Europäische Norm legt die Sicherheitsanforderungen für Brandverhütung und  bekämpfung an Seilbahnen für die Personenbeförderung fest.
In dieser Norm werden Sicherheitsgrundsätze im Bereich Brandverhütung und Brandbekämpfung für Planung, betriebs- und wartungstechnische Erfordernisse der Seilbahnanlagen, sowie Anweisungen für Betrieb und Instandhaltung festgelegt.
Dieses Dokument vervollständigt die bereits vorhandenen und im Vorwort aufgeführten Normen ausschließlich um Aspekte der Brandverhütung und  bekämpfung.
Diese Norm gilt weder für Seilbahnen des Güterverkehrs noch für Aufzüge.

Prescriptions de sécurité pour les installations à câbles transportant des personnes - Prévention et lutte contre les incendies

La présente norme européenne établit les prescriptions de sécurité s’appliquant à la prévention et la lutte contre l’incendie des installations à câbles transportant des personnes.
Dans cette norme, sont définis les principes de sécurité en matière de prévention et de lutte contre les incendies concernant la conception, l'exploitabilité et la maintenabilité des installations à câbles, ainsi que les instructions d’exploitation et de maintenance.
Ce document complète les normes existantes citées à l’avant-propos exclusivement en ce qui concerne les aspects de prévention et de lutte contre les incendies.
Cette norme ne s’applique ni aux installations de transport à câble destinées aux marchandises, ni aux ascenseurs.

Varnostne zahteve za žičniške naprave za prevoz oseb - Preprečevanje in gašenje požara

Ta evropski standard določa varnostne zahteve, ki se uporabljajo za preprečevanje in gašenje požara pri žičniških napravah za prevoz oseb.
Ta standard določa varnostna načela v zvezi s preprečevanjem in gašenjem požara v smislu zasnove, upravljanja in možnosti vzdrževanja žičniških naprav ter navodila za upravljanje in vzdrževanje.
Ta dokument dopolnjuje obstoječe standarde, navedene v predgovoru, izključno v zvezi z vidiki preprečevanja in gašenja požara.
Standard se ne uporablja za žičniške naprave za prevoz blaga ali dvigala.

General Information

Status
Published
Publication Date
13-Nov-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
14-Nov-2018
Completion Date
14-Nov-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SRåDUDSicherheitsanforderungen an Seilbahnen für den Personenverkehr - Brandverhütung und -bekämpfungPrescriptions de sécurité pour les installations à câbles transportant des personnes - Prévention et lutte contre les incendiesSafety requirements for cableway installations designed to carry persons - Prevention and fight against fire45.100Cableway equipment13.220.20Fire protectionICS:Ta slovenski standard je istoveten z:EN 17064:2018SIST EN 17064:2019en,fr,de01-april-2019SIST EN 17064:2019SLOVENSKI

STANDARDSIST-TP CEN/TR 14819-2:2006SIST CEN/TR 14819-1:20041DGRPHãþD
SIST EN 17064:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 17064
November
t r s z
tã t r r wEnglish Version

Safety requirements for cableway installations designed to carry persons æ Prevention and fight against fire Prescriptions de sécurité pour les installations à câbles transportant des personnes æ Prévention et lutte contre les incendies

Sicherheitsanforderungen an Seilbahnen für die Personenbeförderung æ Brandverhütung und æbekämpfung This European Standard was approved by CEN on

s u May
t r s zä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s y r x vã t r s z ESIST EN 17064:2019

EN 17064:2018 (E) 2 Contents Page European foreword ....................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 6 2 Normative references .................................................................................................................................... 6 3 Terms and definitions ................................................................................................................................... 7 4 General requirements ................................................................................................................................... 9 4.1 Application of the standard ......................................................................................................................... 9 4.2 Safety principles .............................................................................................................................................. 9 4.2.1 General ................................................................................................................................................................ 9 4.2.2 Hazard scenarios .......................................................................................................................................... 10 4.2.3 Safety analysis and report......................................................................................................................... 10 4.2.4 Safety objectives ........................................................................................................................................... 10 4.2.5 Safety measures ............................................................................................................................................ 11 4.2.6 Exceptions ....................................................................................................................................................... 12 5 Fire mode ........................................................................................................................................................ 12 5.1 General ............................................................................................................................................................. 12 5.2 General rules for aerial and funicular cableways ............................................................................ 13 5.3 Additional requirements for continuous-movement cableway installations ........................ 13 5.4 Additional requirements for two-way/ one-way/ pulsed cableway installations ............... 13 5.5 Additional requirements for cableway installations with on-board braking systems ....... 14 6 Requirements for carriers ........................................................................................................................ 15 6.1 General properties of materials ............................................................................................................. 15 6.2 Electrical cabinets ........................................................................................................................................ 16 6.3 Wiring outside of electrical cabinets and lighting ........................................................................... 17 6.4 Batteries, battery-powered installations and photovoltaic panels ........................................... 17 6.5 Heating/climate control ............................................................................................................................ 17 6.6 Additional braking systems (brake runner) ...................................................................................... 17 6.7 Measures designed to prevent sudden loss of the on-board braking system in the event of fire on or inside a carrier ......................................................................................................... 17 6.8 Hydraulic control units and circuits, pressurised equipment, coolers .................................... 18 6.9 Specific fire prevention and firefighting equipment ....................................................................... 18 6.10 Other requirements .................................................................................................................................... 19 7 Requirements for tunnels ......................................................................................................................... 19 7.1 General ............................................................................................................................................................. 19 7.2 Materials .......................................................................................................................................................... 20 7.3 Fire/smoke of external origin ................................................................................................................. 20 7.4 Fire/smoke originating inside tunnels ................................................................................................ 20 7.5 Electrical installations ................................................................................................................................ 20 7.6 Safety lighting devices ................................................................................................................................ 20 7.7 Evacuation and rescue routes .................................................................................................................. 20 7.8 Communication device ............................................................................................................................... 20 8 Requirements for spaces, buildings and lines ................................................................................... 21 8.1 General information and vicinity ........................................................................................................... 21 8.2 Other measures for spaces, buildings and lines................................................................................ 21 SIST EN 17064:2019

EN 17064:2018 (F) 3 9 Requirements for the safety of third parties ...................................................................................... 23 10 Instructions for operation and maintenance ..................................................................................... 23 Annexe A (informative) Foreseeable measures for cableway installation spaces and buildings, including for platforms and evacuation route areas for persons........................... 25 Annexe ZA (informative) Relationship between this European Standard and the essential requirements of Regulation (EU) 2016/424 ....................................................................................... 27 Bibliography ................................................................................................................................................................. 28

SIST EN 17064:2019

EN 17064:2018 (E) 4 European foreword This document (EN 17064:2018) has been prepared by Technical Committee CEN/TC 242 “Safety requirements for cableway installations designed to carry persons”, 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, by May 2019 at the latest, and all conflicting national standards shall be withdrawn no later than May 2019. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights or similar rights. CEN shall not be held responsible for identifying any or all such patent rights. This document will supersede CEN/TR 14819-1 and CEN/TR 14819-2. 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 Regulation (EU) 2016/424. For the relationship with Regulation (EU) 2016/424, see informative Annex ZA, which is an integral part of this document. This document comes in response to a request from the European Commission and the CEN and is intended for operators and designers of cableway installations designed to carry persons. This European standard establishes the safety requirements that apply to prevention and fight against fire in cableway installations designed to carry persons. This European standard forms part of the standards programme relating to the safety requirements for cableway installations designed to carry persons. This programme comprises the following standards: — EN 1907, Safety requirements for cableway installations designed to carry persons – Terminology; — EN 12929 (series), Safety requirements for cableway installations designed to carry persons — General requirements; — EN 12930, Safety requirements for cableway installations designed to carry persons — Calculations; — EN 12927 (series), Safety requirements for cableway installations designed to carry persons — Ropes; — EN 1908, Safety requirements for cableway installations designed to carry persons — Tensioning devices; — EN 13223, Safety requirements for cableway installations designed to carry persons — Drive systems and other mechanical equipment; — EN 13796 (series), Safety requirements for cableway installations designed to carry persons — Carriers; — EN 13243, Safety requirements for cableway installations designed to carry persons — Electrical equipment other than for drive systems; SIST EN 17064:2019

EN 17064:2018 (F) 5 — EN 13107, Safety requirements for cableway installations designed to carry persons — Civil engineering works; — EN 1709, Safety requirements for cableway installations designed to carry persons — Pre-commissioning inspection, maintenance and operational inspection and checks; — EN 1909, Safety requirements for cableway installations designed to carry persons — Recovery and evacuation; — EN 12397, Safety requirements for cableway installations designed to carry persons – Operation; — EN 12408, Safety requirements for cableway installations designed to carry persons — Quality assurance; — EN 17064, Safety requirements for cableway installations designed to carry persons — Fire prevention and firefighting. Together these form a series of standards regarding the design, manufacture, construction, maintenance and operation of all cableway installations designed to carry persons. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are required to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, the Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, the Republic of Serbia, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 17064:2019

EN 17064:2018 (E) 6 1 Scope This European standard establishes the safety requirements that apply to prevention and fight against fire in cableway installations designed to carry persons. This standard defines safety principles relating to the prevention of and fight against fires in terms of design, operability and maintainability of cableway installations, and operation and maintenance instructions. This document supplements the existing standards listed in the foreword exclusively in respect of aspects of fire prevention and firefighting. This standard does not apply to cableway installations for the transportation of goods nor to lifts. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the cited edition applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1021-1, Furniture — Assessment of the ignitability of upholstered furniture — Part 1: Ignition source: smouldering cigarette EN 1021-2, Furniture — Assessment of the ignitability of upholstered furniture — Part 2: Ignition source: match flame equivalent EN 1838, Lighting applications — Emergency lighting EN 1907, Safety requirements for cableway installations designed to carry persons — Terminology EN 12929-1, Safety requirements for cableway installations designed to carry persons — General requirements — Part 1: Requirements for all installations EN 13243:2015, Safety requirements for cableway installations designed to carry persons — Electrical equipment other than for drive systems EN 13501-1:2007+A1:2009, Fire classification of construction products and building elements — Part 1: Classification using test data from reaction to fire tests EN 50172, Emergency escape lighting systems EN 50272-1, Safety requirements for secondary batteries and battery installations — Part 1: General safety information EN 50272-2, Safety requirements for secondary batteries and battery installations — Part 2: Stationary batteries EN 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1) EN 60695-11-10, Fire hazard testing — Part 11-10: Test flames — 50 W horizontal and vertical flame test methods (IEC 60695-11-10) SIST EN 17064:2019

EN 17064:2018 (F) 7 EN 61730-1, Photovoltaic (PV) module safety qualification — Part 1: Requirements for construction (IEC 61730-1) EN 61730-2, Photovoltaic (PV) module safety qualification — Part 2: Requirements for testing (IEC 61730-2) EN ISO 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs (ISO 7010) EN ISO 8528-13, Reciprocating internal combustion engine driven alternating current generating sets — Part 13: Safety (ISO 8528-13) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1907 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: http://www.electropedia.org/ • ISO Online browsing platform: http://www.iso.org/obp NOTE Where definitions are identical to those in the EN 13501 series, this is indicated. 3.1 fire resistance ability of an object to maintain for a specified period the required fire stability, fire integrity, thermal insulation and/or any other required function specified in a standardized fire resistance test Note 1 to clause: The qualifier "fire resistant" only applies to this ability. 3.2 reaction to fire behaviour of a material that, as a result of its own decomposition, feeds a fire to which it is exposed under specified conditions [SOURCE: EN 13501-1:2007+A1:2009, 3.1.15, amended — "Product" has been replaced with "material" and the structure of this definition has been amended slightly.] 3.3 R – Load-bearing capacity load-bearing capacity R is the ability of one or more surfaces of a building element to withstand exposure to fire for a given duration under defined mechanical actions, without loss of structural stability [SOURCE: EN 13501-2:2016, 5.2.1] 3.4 E – Fire integrity criterion

fire integrity criterion E is the ability of one side of a separating building element to resist exposure to fire, without transferring the fire to the unexposed side through passage of large quantities of flame or hot gas to the non-exposed side [SOURCE: EN 13501-2:2016, 5.2.2.1] SIST EN 17064:2019

EN 17064:2018 (E) 8 3.5 I – Thermal insulation thermal insulation I is the ability of one side of a building element to resist exposure to fire without passing the fire from the exposed side to the unexposed side through significant heat transfer [SOURCE: EN 13501-2:2016, 5.2.3.1] 3.6 REI tt, EI tt, R tt tt: minimum time for which all of the criteria concerned in the specific case are met

EXAMPLE REI 60, EI 30, R 30. 3.7 Increased recovery time
iRT

time, expressed in minutes, equal to 1.5 times the duration which, in the event of fire, may be required for the loaded carrier to reach an evacuation area as quickly as possible, using the main or auxiliary drive system Note 1 to clause: The factor 1.5 takes into account, among other things, the time that may be required to restart or change direction and the time required for persons exiting the carrier to reach a safe place. 3.8 evacuation area an area where users may exit the carrier and reach a safe place, following an evacuation route if necessary (self-evacuation and/or assisted evacuation) EXAMPLE Stations. 3.9 compact station a type of station in which the technical components of the cableway installation and the shell of the station are supported by a single load-bearing structure Note 1 to clause: Examples of compact stations. In example a), part of the compact station is included in a building. SIST EN 17064:2019

EN 17064:2018 (F) 9
a) b)

c) Figure 1 — Example of compact stations 3.10 fire mode final operating mode enabling safety functions to be overridden easily and simply to facilitate the recovery of carriers in the event of a fire in the cableway installation 3.11 tunnel natural or artificial covering, longer than 80 m, irrespective of the type of construction: whether hollowed out or submerged, a covered trench, acoustic shell, or partial covering with a permanent external opening of a surface area less than one-fifth of the surface area of the apron Note 1 to clause: The length of the tunnel is the distance between the two ends of the tunnel or between two stations. 4 General requirements 4.1 Application of the standard The requirements of this document apply to all cableway installations designed to carry persons together with those of European standards EN 1709, EN 1908, EN 1909, EN 12397, EN 12408, EN 12927 (series), EN 12929 (series), EN 12930, EN 13107, EN 13223, EN 13243 and EN 13796 (series). 4.2 Safety principles 4.2.1 General

The safety principles set out in EN 12929-1 apply. SIST EN 17064:2019

EN 17064:2018 (E) 10 4.2.2 Hazard scenarios The following events may lead to hazardous situations which may be avoided or limited by the requirements of this document: — fire in a carrier; — fire along the line and/or in the tunnel; — fire in a station, particularly in a machinery space, a tensioning device space, electrical spaces, a drive unit in a compact station or a control point; NOTE Examples of electrical spaces: power space, transformer space. — fire outside the cableway installation and/or in spaces and buildings neighbouring the cableway installation. Specifically, the following aggravating elements should be taken into account: a) for all cableway installations: 1) stoppage of the cableway installation or carriers when a safety device is triggered; 2) because of the location or configuration of the cableway installation and the weather conditions, a certain time delay may be required for internal and/or external emergency and firefighting teams to arrive; 3) absence or insufficiency of an evacuation plan for persons; 4) absence or insufficiency of an evacuation route for persons; 5) foreseeable inappropriate behaviour of persons (passengers, personnel, third parties); b) for cableway installations in tunnels: additionally: 1)

tack effect of the tunnel; 2) change of direction of fumes and hot gases due to pressure differences. 4.2.3 Safety analysis and report The safety analysis and report shall take into consideration fire hazards. NOTE This standard is designed to help with drafting the safety analysis and report in relation to fire hazards. 4.2.4 Safety objectives Fire outbreak and fire spread hazards shall be minimised in the design, operation and maintenance of cable installations. The risk of endangering persons due to fire and/or any smoke emissions shall be minimised. SIST EN 17064:2019

EN 17064:2018 (F) 11 In the event of fire, the cableway installation shall be kept operational for as long as possible to ensure the recovery of persons.

NOTE This applies in particular to load-bearing, hauling and hauling/load-bearing cables, cable connections, as well as cable anchor points and tensioning devices. If fire breaks out in a carrier on the line, the priority is for it to reach an evacuation area as quickly as possible. If fire breaks out in a station and/or in a carrier in a station, the priority is to evacuate persons from carriers and from the station. Recovery of carriers during a fire shall be facilitated in the event of a safety device being triggered. 4.2.5 Safety measures In order to avoid or limit the hazardous scenarios listed in 4.2.2, safety measures shall be established based on the safety analysis outlined in 4.2.3, thereby ensuring that carrier passengers or persons present in the station avoid being injured by fire or choked by smoke. The safety measures shall take account of the type of cableway installation, the type of construction, the installation site and the local environment (roads, railways, buildings, forest, etc.). The measures listed in this document are construction and operational measures intended to: — avoid a fire resulting in damage to the cableway installation; — minimize the thermal loads in the cableway installation; — limit the damaging effects of a fire on the major safety components by timely detection, alarm and firefighting; — define adequate characteristics (in particular, reaction to fire and fire resistance) of the major safety components taking into account thermal stressing in the event of a fire in the cableway installation; — provide a fire-resistant separation between adjoining areas for an adequate period of time; — install adequate evacuation routes in stations and/or along the line; — provide personnel and passengers with suitable instructions; — provide training allowing personnel to act appropriately regarding fire prevention and firefighting. If recovery of carriers during a fire is required, the cableway installation shall be kept operational for the increased recovery time "iRT". In addition, if it is necessary, "fire mode" also allows carriers to be recovered as quickly as possible when one or several devices that engage a safety function (in accordance with EN 13243:2015, 3.1) no longer fulfil their function due to the fire. NOTE Devices that engage a safety function are, for example, external sensors and their electrical cables, whether on the line, in stations, or in carriers.

SIST EN 17064:2019

EN 17064:2018 (E) 12 4.2.6 Exceptions Exceptions to the provisions of this standard are possible, specifically in the case of innovations or in the specific case of cableway installations that do not have personnel present on the installation. These exceptions shall be justified by a safety analysis and achieve at least the same safety level. Exceptions to the provisions of this standard are also possible if components on existing cableway installations are replaced. 5 Fire mode 5.1 General The safety analysis shall determine whether the "fire mode" described below is relevant to the cableway installation. This determination shall take into account residual fire hazards after implementation of other measures included in this standard. The "fire mode" is intended to facilitate the recovery of carriers in the event of a fire outside of electrical spaces (e.g. control point, transformer space, low-voltage space) or machinery spaces. If a fire may damage detection elements (line, stations, carriers) and/or their electric cabling, it shall be possible, in "fire mode", as an exception to the standards cited in chapter 2, to override these safety functions in order to undertake the aforementioned recovery. The "fire mode" may only be activated by the operator and shall be used only in the event of a fire. Each activation of the "fire mode" shall be automatically stored in electronic format. The "fire mode" is designed to be as quick and easy as possible. When "fire mode" is activated, safety functions may be overridden as a whole or in groups of sub-assemblies. NOTE 1 Sub-assemblies can be grouped as follows: — drive station; — return station; — intermediate stations; — line or line sections; — two-way, one-way, pulsed and funicular aerial carrier;

— other: as appropriate depending on the safety analysis (for example: specific line section travelling above a forest, barn, building etc.). In "fire mode", the driver shall be able to adjust the speed of the cableway installation up to the maximum speed permitted at each point of the line. However, the functionality of the cableway installation in "fire mode" cannot be guaranteed under certain conditions, specifically in the event of a fire in electrical spaces (e.g. control point, transformer space, low-voltage space) or machinery spaces. NOTE 2 The power space is a low-voltage space. SIST EN 17064:2019

EN 17064:2018 (F) 13 5.2 General rules for aerial and funicular cableways In fire mode, the following requirements apply: a) The "fire mode" shall be designed to incorporate the main and auxiliary motors. b) If there is a general override of the safety functions, this "fire mode" shall be selected using an individual manual control mechanism. If the "fire mode" can be implemented via a grouping, such as that shown in Subclause 5.1, dedicated individual manual control mechanisms engage the "fire modes" at sub-assembly level.

c) All “fire mode” control mechanisms shall be located in the control point of the cableway installation.

d) Access to each individual manual "fire mode" control mechanism shall be designed so as to prevent its accidental handling. NOTE Access via a protected box, either break-glass or lead-sealed, can meet this requirement. e) Any inadvertent triggering of this "fire mode", following technical malfunction, should be avoided. f) A single technical malfunction on a control mechanism as defined in 5.2.b) shall not prevent the activation of the "fire mode”. g) As an exception to the standards referred to in chapter 2, engagement of “fire mode” shall not cause the cableway installation to come to a stop. Moreover, it is possible to start the cableway installation in “fire mode”. h) The "fire mode" helps to recover carriers at the maximum speed permitted at each point of the line, by ruling out stoppages and reductions in speed caused by the fault or malfunction of a device that engages a safety function (in accordance with EN 13243:2015, 3.1).

i) The activation of the "fire mode" shall trigger a special signal that may be clearly perceived by the driver of the cableway installation. If the communication systems are operational at the time that the "fire mode" is activated, this signal shall be triggered at all stations of the cableway installation. The special signal shall be clearly perceived by the operating personnel present. j) In "fire mode", all electrical control mechanisms (stop buttons) designed to stop the cableway installation shall be overridden, with the exception of those active at the control point. The electrical control mechanisms (stop buttons) on sub-assemblies that are not overridden, designed to stop the cableway installations that are present when necessary

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