SIST EN 1777:2010
(Main)Hydraulic platforms (HPs) for fire fighting and rescue vehicles - Safety requirements and testing
Hydraulic platforms (HPs) for fire fighting and rescue vehicles - Safety requirements and testing
This European Standard applies to vehicle mounted Hydraulic Platforms (HP's) as defined in 3.1, intended for use by fire and rescue services. HP's may participate in fire fighting, rescue or protection of persons, protection of the environment and in a variety of other technical operations. This document identifies the significant hazards (see Clause 4) for all sizes of HP's used by fire and rescue services, on the basis that they are supplied in a complete form, tested and ready for use. It also gives methods for the elimination or reduction of these hazards. This document applies only to HP's classified in group B - type 1 according to EN 280:2001, 1.4. This document is intended to be used in conjunction with EN 1846-2 and EN 1846-3. This document deals with the technical safety requirements to minimise the hazards listed in Clause 4 which can arise during the commissioning, the operational use, the routine checking and maintenance of hydraulic platforms when carried out in accordance with the specifications given by the manufacturer or his authorised representative. This document deals with all significant hazards, hazardous situations and events relevant to HP's, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer and taking account of their whole lifecycle (see Clause 4).
Hubrettungsfahrzeuge für Feuerwehren und Rettungsdienste, Hubarbeitsbühnen (HABn) - Sicherheitstechnische Anforderungen und Prüfung
Diese Europäische Norm gilt für auf Fahrzeugen aufgebaute Hubarbeitsbühnen (HABn) nach 3.1 für die Feuerwehr und Rettungsdienste. HABn können an der Brandbekämpfung, der Rettung und dem Schutz von Personen, dem Schutz der Umwelt und an vielfältigen sonstigen technischen Einsätzen beteiligt sein.
Dieses Dokument legt die wesentlichen Gefährdungen (siehe Abschnitt 4) bei Verwendung aller HABn Grö¬ßen für die Feuerwehr und Rettungsdienste fest, vorausgesetzt, sie werden in komplettem, geprüftem und einsatzbereitem Zustand ausgeliefert. Außerdem legt die Norm Verfahren zur Beseitigung oder Verminderung dieser Gefährdungen fest. Das vorliegende Dokument gilt nur für HABn, die nach EN 280:2001, 1.4 in Gruppe B – Typ 1 eingruppiert sind.
ANMERKUNG 1 HABn der Gruppe B – Typ 1 sind diejenigen, bei denen die senkrechte Ausladung des Lastschwer-punktes außerhalb der Kippkanten liegen kann und bei denen das Umsetzen nur zulässig ist, wenn sich die HAB in ihrer Transportstellung befindet.
Folglich gilt dieses Dokument nicht für HABn mit der folgenden Klassifizierung nach EN 280:2001, 1.4:
- Gruppe A – Typ 1;
- Gruppe A Typ 2;
- Gruppe A Typ 3;
- Gruppe B Typ 2;
- Gruppe B Typ 3.
Es ist vorgesehen, dieses Dokument in Verbindung mit EN 1846 2 und EN 1846 3 zu verwenden.
Das vorliegende Dokument behandelt die technischen Sicherheitsanforderungen zum Minimieren der in Abschnitt 4 aufgeführten Gefährdungen, die während der Inbetriebnahme, des betrieblichen Einsatzes, der Routineüberprüfungen und Instandhaltung von Hubarbeitsbühnen auftreten können, wenn diese Arbeiten in Übereinstimmung mit den Festlegungen des Herstellers oder seines bevollmächtigten Stellvertreters ausge-führt werden.
Bras Élévateur Aérien (BEA) des services d'incendie et de secours - Prescriptions de sécurité et essais
Le présent document spécifie les prescriptions et les mesures de sécurité techniques pour les bras élévateurs aériens (BEA) utilisés par des services de secours et de lutte contre l'incendie. Les BEA peuvent intervenir pour faciliter les opérations de lutte contre l'incendie, de protection des personnes et de l'environnement, pendant les opérations de lutte contre l'incendie et au cours d'autres interventions techniques.
Le présent document identifie les phénomènes dangereux significatifs (voir Article 4) pour toutes les tailles de BEA utilisés par des services de secours et de lutte contre l'incendie, tel qu'ils sont fournis sous leur forme finale, ayant été soumis à essai et prêts à être utilisés, et fournit des méthodes pour éliminer ou réduire ces phénomènes dangereux et pour appliquer des pratiques de travail sans danger.
Le présent document couvre les BEA dans lesquels la projection verticale du centre de gravité de la charge peut être à l'extérieur des lignes de renversement et pour lesquels le déplacement est uniquement autorisé lorsque le BEA est dans sa position de transport. Autrement dit, le présent document s'applique uniquement aux BEA du groupe B type 1 selon le 1.4 de l'EN 280:2001.
Par conséquent le présent document ne s’applique pas aux BEA appartenant à la classification suivante conformément au 1.4 de l’EN 80:2001 :
groupe A type 1 ;
groupe A type 2 ;
groupe A type 3 ;
groupe B type 2 ;
groupe B type 3.
NOTE Les principes du présent document ont été utilisés pour les BEA allant des plus petites hauteurs de travail jusqu'aux hauteurs de travail dépassant 70 m, et sont destinés à être appliqués à tous les développements envisageables pour les BEA destinés aux services de secours et de lutte contre l'incendie.
Le présent document est destiné à être utilisé conjointement avec l'EN 1846 2 et l'EN 1846 3 pour les BEA montés sur véhicules porteurs.
Hidravlične ploščadi (HPs) za gasilske in reševalne enote - Varnostne zahteve in preskušanje
Ta evropski standard velja za hidravlične ploščadi (HP), nameščene na vozila, kot so opredeljene v točki 3.1, namenjene temu, da jih uporabljajo gasilske in reševalne enote. HP so lahko udeležene pri gašenju požarov, reševanju ali zaščiti oseb, zaščiti okolja in pri različnih drugih tehničnih operacijah. Ta dokument opredeljuje velike nevarnosti (glej Klavzulo 4) za vse velikosti HP, ki jih uporabljajo gasilske in reševalne enote, pod pogojem, da so priskrbljene v popolni obliki, preskušene in pripravljene za uporabo. Prav tako podaja metode za odpravo ali zmanjševanje teh nevarnosti. Ta dokument velja le za HP, klasificirane v skupino B – vrste 1 po EN 280:2001, točki 1.4. Ta dokument se uporablja skupaj z EN 1846-2 in EN 1846-3. Ta dokument obravnava tehnične varnostne zahteve za minimaliziranje nevarnosti, navedenih v Klavzuli 4, do katerih lahko pride med prevzemom, operativno rabo, rutinskim pregledom in vzdrževanjem hidravličnih ploščadi, ki se izvajajo v skladu s specifikacijami, ki jih je podal proizvajalec ali njegov pooblaščeni predstavnik. Ta evropski standard obravnava vse velike nevarnosti, nevarne situacije in primere, ki se tičejo HP, kadar se uporabljajo, kot je predvideno, in pod pogoji napačne uporabe, ki jih razumno predvidi proizvajalec in ob upoštevanju njihovega celotnega življenjskega cikla(glej Klavzulo 4).
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SUHVNXãDQMHHubrettungsfahrzeuge für Feuerwehren und Rettungsdienste, Hubarbeitsbühnen (HABn) - Sicherheitstechnische Anforderungen und PrüfungBras Élévateur Aérien (BEA) des services d'incendie et de secours - Prescriptions de sécurité et essaisHydraulic platforms (HPs) for fire fighting and rescue vehicles - Safety requirements and testing13.220.10Gašenje požaraFire-fightingICS:Ta slovenski standard je istoveten z:EN 1777:2010SIST EN 1777:2010en,fr,de01-junij-2010SIST EN 1777:2010SLOVENSKI
STANDARDSIST EN 1777:2005+A1:20091DGRPHãþD
SIST EN 1777:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1777
March 2010 ICS 13.220.10 Supersedes EN 1777:2004+A1:2009English Version
Hydraulic platforms (HPs) for fire fighting and rescue services - Safety requirements and testing
Bras Élévateur Aérien (BEA) des services d'incendie et de secours - Prescriptions de sécurité et essais
Hubrettungsfahrzeuge für Feuerwehren und Rettungsdienste, Hubarbeitsbühnen (HABn) - Sicherheitstechnische Anforderungen und Prüfung This European Standard was approved by CEN on 6 February 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1777:2010: ESIST EN 1777:2010
EN 1777:2010 (E) 2 Contents Page Foreword .4Introduction .61 Scope .72 Normative references .73 Terms and definitions .94 List of significant hazards . 125 Safety requirements and/or protective measures . 155.1 General . 155.2 Stability and structural calculations . 155.2.1 General . 155.2.2 Loads and forces . 165.2.3 Determination of loads and forces . 165.2.4 Stability calculations . 195.2.5 Structural calculations . 245.3 Chassis and stabilizers . 265.4 Extending structure . 285.4.1 Methods to reduce the risk of overturning and exceeding permissible stresses . 285.4.2 Operation of the extending structure in a specific sequence to avoid instability . 315.4.3 Locking of masts at fixed working position . 325.4.4 Crushing and shearing points between parts of the extending structure, the base and platform . 325.4.5 Emergency evacuation means for the platform . 325.4.6 Operator seat . 345.4.7 Supporting of extending structure in transport position . 345.5 Extending structure drive systems . 345.5.1 General . 345.5.2 Wire rope drive systems . 355.5.3 Chain drive systems . 375.6 Platform . 385.7 Controls . 415.8 Electrical systems. 445.9 Pneumatic control systems . 455.10 Hydraulic drive systems . 465.11 Hydraulic cylinders . 475.11.1 Structural design . 475.11.2 Prevention of unintended movement of the cylinder . 525.11.3 Verification of requirements on hydraulic cylinders . 525.12 Static tilt angle δδδδ. 535.13 Safety devices . 536 Verification . 566.1 Type tests . 566.1.1 General . 566.1.2 Static test to verify the stability calculation . 566.1.3 Residual load test . 576.1.4 Static overload test . 576.1.5 Ladder type tests . 576.1.6 Dynamic tests . 586.1.7 Tests of vertical load sensing and total moment sensing systems . 58SIST EN 1777:2010
EN 1777:2010 (E) 3 6.1.8 Type test on noise . 596.2 Acceptance tests . 597 Information for use . 597.1 Instruction handbook . 597.1.1 General . 597.1.2 Operating instructions . 597.1.3 Transport, handling and storage information . 607.1.4 Information on commissioning . 617.1.5 HP details . 617.1.6 Maximum permitted loads on the platform . 617.1.7 Maintenance information for use by trained personnel . 617.1.8 Special working methods or conditions . 627.1.9 Operating instructions for emergency . 627.1.10 Periodical examinations and tests . 627.2 Marking . 627.3 Safety signs . 64Annex A (informative)
Special loads and forces — Use of HP's in wind speeds greater than Beaufort Scale 6 (see 5.2.3.4.1) . 65Annex B (informative)
Dynamic factors in stability and structural calculations . 66Annex C (informative)
Major alterations and repairs. 67Annex D (normative)
Design of wire rope drive systems for the extending structures and platform levelling systems . 68D.1 General . 68D.2 Calculation of rope drive . 68D.3 Calculation of rope diameter (coefficient c) . 68D.4 Calculation of the diameters of rope drums, rope pulleys and compensating pulleys [coefficient (h1 × h2)] . 70D.5 Efficiency of rope drives . 73Annex E (informative)
Calculation example of Annex D for wire rope, drum and pulley diameters . 75E.1 Notes . 75E.2 Annex D method summarised . 75E.3 Example . 76E.3.1 General . 76E.3.2 Drive group — See D.2 and Table D.1 . 76E.3.3 Calculation of minimum rope diameter — See D.3 . 76E.3.4 Calculation of the diameters of rope drums, pulleys and static pulleys — See D.4 . 77Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC . 80Bibliography . 81 SIST EN 1777:2010
EN 1777:2010 (E) 4 Foreword This document (EN 1777:2010) has been prepared by Technical Committee CEN/TC 192 “Fire service equipment”, the secretariat of which is held by BSI. 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 September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. 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 supersedes EN 1777:2004+A1:2009. 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. Significant changes The significant changes with respect to the previous edition EN 1777:2004+A1:2009 are listed below: a) Scope revised to state more precisely, limitation of scope to HP's with classification group B − type 1 according to EN 280:2001, 1.4 only and deletion of requirements and tests relating to all other groups and types not covered by the scope, flat belts for extending structure drive systems excluded from scope; b) terms and definitions of "hydraulic platform (HP)" and "levelling" added; c) some terms and definitions revised; d) list of significant hazards editorially revised and hazards relating to self propelled HP's and Group A HP's (where the vertical projection of the centre of gravity of the load is always inside the tipping lines) deleted, which are outside the scope; e) specific tests directly linked to the appropriate requirement; f) requirements relating to temperature range, forces, calculation, fatigue stress analyses, chassis and stabilizers revised; g) requirements and tests added relating to "Moment sensing system with increased safety requirements and enhanced overload criteria" as a new, fourth solution to reduce tilting hazards and hazards caused by exceeding of permissible loads; h) requirements and tests added relating to a minimum residual load of 6 % of the vehicle's unladen mass (obtained on the not loaded side, in the most unfavourable position); i) new subclause 5.13 "Safety devices" added analogous to EN 280/A1:2004; j) requirement added that the extending structure shall be supported in the transport position in such a way as to avoid harmful vibrations during transport; k) requirement added that failures in wire rope or chain drive systems for extending structure shall be self-revealing; l) maximum tensile grade of the wires in wire rope drive systems for extending structure increased to 2 160 N/mm2; m) leadscrew and rack and pinion drive systems deleted; SIST EN 1777:2010
EN 1777:2010 (E) 5 n) warning signals shall consist of a continuous visual warning and an acoustic signal; o) height difference after the static overload test is now depending from the rescue height (for HP's with a rescue height up to 30 m, the height difference shall be less than 100 mm following application of 150 % of the rated load 10 min after unloading, for HP's with a rescue height greater than 30 m the manufacturer shall state the maximum height difference); p) emergency evacuation means for the platform added (rescue ladder fixed in parallel to the extending structure or alternatives after carrying out a risk assessment); q) requirements on platform doors and guardrails/handrails revised; r) anchoring points for the allowed number of persons in the cage for personal protective equipment against falling added; s) device added to stop all aggravating movements on sustaining impact; t) requirements and tests relating to operator seat, controls and electrical systems revised; u) pneumatic and hydraulic control systems revised that besides the specific requirements the basic standards EN 983 and EN 982 applies; v) requirements and tests revised relating to static tilt angle δ ; w) at acceptance tests and at periodical examinations and tests the static overload test has been added; x) instruction handbook added with test report, where appropriate, detailing the static and dynamic tests; y) operating instructions for emergency added; z) marking revised; aa) Annex A and Annex B revised according to the changes in EN 280; bb) former Annex F (Calculation example — Dynamic factor, kerb test) deleted, because the kerb test relates to self propelled HP's, which are outside the scope; cc) content of standard editorially revised. 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, Croatia, 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 1777:2010
EN 1777:2010 (E) 6 Introduction This document is a type C standard as stated in EN ISO 12100. The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this document. When provisions of this type C standard are different from those which are 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. As no satisfactory explanation could be found for the dynamic factors used for stability calculations in EN 280 and previous national standards, the results of the tests carried out by CEN/TC 98 "Lifting platforms" to determine a suitable factor and stability calculation method for mobile elevating work platforms (MEWPs) have been adopted. The test method is described in Annex B as a guide for manufacturers wishing to use higher or lower operating speeds and to take advantage of developments in control systems. Similarly, to avoid the unexplained inconsistencies in wire rope coefficients of utilization and drum and pulley diameters found in other standards for lifting devices, EN 280:2001, Annex C based on DIN 15020-1, together with EN 280:2001, Annex D, have been adopted. SIST EN 1777:2010
EN 1777:2010 (E) 7 1 Scope This European Standard applies to vehicle mounted Hydraulic Platforms (HP's) as defined in 3.1, intended for use by fire and rescue services. HP's may participate in fire fighting, rescue or protection of persons, protection of the environment and in a variety of other technical operations. This document identifies the significant hazards (see Clause 4) for all sizes of HP's used by fire and rescue services, on the basis that they are supplied in a complete form, tested and ready for use. It also gives methods for the elimination or reduction of these hazards. This document applies only to HP's classified in group B − type 1 according to EN 280:2001, 1.4. NOTE 1 HPs of group B − type 1 are those where the vertical projection of the centre of gravity of the load may be outside the tipping lines and for which travelling is only allowed with the HP in its travel condition. Consequently this document does not apply to HP's with the following classification according to EN 280:2001, 1.4: group A − type 1; group A − type 2; group A − type 3; group B − type 2; group B − type 3. This document is intended to be used in conjunction with EN 1846-2 and EN 1846-3. This document deals with the technical safety requirements to minimise the hazards listed in Clause 4 which can arise during the commissioning, the operational use, the routine checking and maintenance of hydraulic platforms when carried out in accordance with the specifications given by the manufacturer or his authorised representative. This document deals with all significant hazards, hazardous situations and events relevant to HP's, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer and taking account of their whole lifecycle (see Clause 4). NOTE 2 The lifecycle includes construction, transport, assembly and installation, commissioning, use (including setting, teaching/programming or process changeover), operation, cleaning, fault finding, maintenance, decommissioning, dismantling and, as far as safety is concerned, disposal. This document does not deal with the additional hazards for: use in underground work (mines); use in potentially explosive atmospheres; flat belts for extending structure drive systems. This document is not applicable to HP's which were manufactured before the date of publication of this document by CEN. 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. SIST EN 1777:2010
EN 1777:2010 (E) 8 EN 349, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body EN 842, Safety of machinery — Visual danger signals — General requirements, design and testing EN 894-1, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 1: General principles for human interactions with displays and control actuators EN 894-2, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 2: Displays EN 894-3, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 3: Control actuators prEN 894-4, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 4: Location and arrangement of displays and control actuators EN 981, Safety of machinery — System of auditory and visual danger and information signals EN 982, Safety of machinery — Safety requirements for fluid power systems and their components — Hydraulics EN 983, Safety of machinery — Safety requirements for fluid power systems and their components — Pneumatics EN 1846-1:1998, Firefighting and rescue service vehicles — Part 1: Nomenclature and designation EN 1846-2:2009, Firefighting and rescue service vehicles — Part 2: Common requirements — Safety and performance EN 1846-3, Firefighting and rescue service vehicles — Part 3: Permanently installed equipment — Safety and performance EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:2005, modified) EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 60947-5-1, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching elements — Electromechanical control circuit devices (IEC 60947-5-1:2003)
CEN/TS 15989, Firefighting vehicles and equipment — Symbols for operator controls and other displays 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) EN ISO 13732-1, Ergonomics of the thermal environment — Methods for the assessment of human responses to contact with surfaces — Part 1: Hot surfaces (ISO 13732-1:2006) EN ISO 13849-1:2008, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1:2006) EN ISO 13849-2, Safety of machinery — Safety-related parts of control systems — Part 2: Validation (ISO 13849-2:2003) EN ISO 13850, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006) EN ISO 14122-3, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs, stepladders and guard-rails (ISO 14122-3:2001) SIST EN 1777:2010
EN 1777:2010 (E) 9 EN ISO 14122-4, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders (ISO 14122-4:2004) ISO 2408:2004, Steel wire ropes for general purposes — Minimum requirements ISO 3864-1, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety signs in workplaces and public areas ISO 3864-2:2004, Graphical symbols — Safety colours and safety signs — Part 2: Design principles for product safety labels ISO 3864-3, Graphical symbols — Safety colours and safety signs — Part 3: Design principles for graphical symbols for use in safety signs ISO 4305, Mobile cranes — Determination of stability ISO 4309, Cranes — Wire ropes — Care, maintenance, installation, examination and discard
3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1846-1:1998, EN 1846-2:2009, EN ISO 12100-1:2003 and the following apply. NOTE The terms platform, extending structure, base, lowering/raising, slewing, rotating and travelling are illustrated in Figure 1 and Figure 2. 3.1 hydraulic platform
HP elevating platform consisting of a work platform and a hydraulic extending structure, mounted on a base that is a self propelled chassis and intended for moving persons and their equipment, and in some cases also fire fighting monitors, to working locations for interventions such as those related to fire fighting, rescue or protection of persons, protection of the environment and in a variety of other technical operations 3.2 platform fenced platform in which persons and equipment are carried and which can be moved under load to the required working position by the extending structure and/or by movement of the base NOTE Secondary platforms may include for example extended floors outside guardrails for rescue purposes or landings for access to boom ladders. 3.3 extending structure one or more rigid or telescopic or articulating mechanisms, or any combination of them in the form of booms and/or ladders or scissor mechanism which may or may not slew on the base 3.4 stabilizer device or system used to maintain the stability of the HP NOTE These include for example screw jacks, hydraulic jacks, outriggers, vehicle suspension locking devices, extending axles, systems for levelling the extending structure relative to the base, etc. SIST EN 1777:2010
EN 1777:2010 (E) 10 3.5 access position position of the
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