SIST EN 13374:2013+A1:2019
(Main)Temporary edge protection systems - Product specification - Test methods
Temporary edge protection systems - Product specification - Test methods
This document specifies the requirements and test methods for temporary edge protection systems for
use during construction or maintenance of buildings and other structures.
This document applies to edge protection systems for flat and inclined surfaces and specifies the
requirements for three classes of temporary edge protection.
For edge protection systems with an arrest function (e.g. falling or sliding down a sloping roof) this
standard specifies requirements for energy absorption.
This standard includes edge protection systems, some of which are fixed to the structure and others,
which rely on gravity and friction on flat surfaces.
This standard does not provide requirements for edge protection systems intended for:
— protection against impact from vehicles or from other mobile equipment,
— protection from sliding down of bulk loose materials, snow etc,
— protection of areas accessible to the public.
This standard does not apply to side protection on scaffolds according to EN 12811-1 and EN 1004.
NOTE This does not prevent these systems to be used on temporary structures.
Temporäre Seitenschutzsysteme - Produktfestlegungen - Prüfverfahren
Dieses Dokument legt Anforderungen und Prüfverfahren für temporäre Seitenschutzsysteme fest, die während der Errichtung oder der Instandhaltung von Gebäuden oder sonstigen Baukonstruktionen angewendet werden.
Dieses Dokument gilt für Seitenschutzsysteme an ebenen und geneigten Flächen und legt die Anforderungen an temporäre Seitenschutzsysteme fest, die nach drei Klassen unterschieden werden.
Für Seitenschutzsysteme mit Auffangfunktion (z. B. beim Fallen oder Abgleiten von einer geneigten Dachfläche) werden in dieser Norm Anforderungen an die Energieaufnahmefähigkeit festgelegt.
Diese Norm erfasst sowohl Seitenschutzsysteme, die mit der Konstruktion verbunden werden, als auch andere, deren Lage auf ebenen Oberflächen durch Schwerkraft und Reibung gesichert wird.
Diese Norm enthält keine Anforderungen an Seitenschutzsysteme, die vorgesehen sind für den Schutz:
- gegen Stöße durch Fahrzeuge oder andere bewegliche Geräte;
- gegen das Abgleiten von losem Schüttgut, Schnee usw.;
- von Passanten in öffentlich zugänglichen Bereichen.
Diese Norm gilt nicht für Seitenschutzbauteile an Gerüsten nach EN 12811-1 und EN 1004.
ANMERKUNG Das heißt nicht, dass die Verwendung dieser Systeme an temporären Konstruktionen ausgeschlossen ist.
Garde-corps périphériques temporaires - Spécification du produit - Méthodes d'éssai
Le présent document spécifie les exigences et les méthodes d'essai relatives aux garde-corps périphériques temporaires destinés à être utilisés lors de la construction ou de l'entretien de bâtiments et d'autres structures.
Le présent document s'applique aux garde-corps périphériques pour surfaces planes et inclinées et spécifie les exigences relatives à trois classes de garde-corps périphériques temporaires.
Pour les garde-corps périphériques remplissant une fonction antichute (par exemple, chute ou glissade le long d'une toiture en pente), la présente norme spécifie les exigences concernant l'absorption d'énergie.
La présente norme traite de garde-corps périphériques dont certains sont fixés à la structure et certains autres sont fondés sur la pesanteur et le frottement sur des surfaces planes.
La présente norme ne donne pas d'exigences relatives à des garde-corps périphériques destinés à :
- la protection contre le choc impliquant des véhicules ou autres équipements mobiles ;
- la protection contre le glissement de masses de matériaux meubles, neige, etc. ;
- la protection du public en général contre la chute.
La présente norme ne s'applique pas à la protection latérale sur les échafaudages conformes à l'EN 12811-1 et à l'EN 1004.
NOTE Cela n'empêche pas d'utiliser ces systèmes sur des structures temporaires.
Začasne ograje - Specifikacija proizvoda - Metode preskušanja
Ta dokument določa zahteve in preskusne metode za sisteme za začasno zaščito robov, ki naj se uporabljajo med gradnjo ali vzdrževanjem stavb in drugih objektov.
Ta dokument se nanaša na sisteme za zaščito robov za ravne in nagnjene površine ter določa zahteve za tri razrede začasne zaščite robov.
Za sisteme z zaščito robov s funkcijo ustavljanja (npr. padanje ali drsenje s strehe z naklonom) ta standard določa zahteve za absorpcijo energije.
Ta standard vključuje sistem za zaščito robov, od katerih so nekateri pritrjeni na strukturo, drugi pa se zanašajo na težnost in trenje na ravnih površinah.
Ta standard ne vključuje zahtev za sisteme za zaščito robov, ki so namenjeni:
– zaščiti pred trki vozil in druge premikajoče se opreme,
– zaščiti pred zdrsom kupov prostega materiala, snega itd.,
– zaščiti področij, ki so dostopna javnosti.
Ta standard se ne uporablja za stransko zaščito odrov v skladu z EN 12811-1 in EN 1004.
OPOMBA: To ne preprečuje uporabe teh sistemov na začasnih strukturah.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Temporäre Seitenschutzsysteme - Produktfestlegungen - PrüfverfahrenGarde-corps périphériques temporaires - Spécification du produit - Méthodes d'éssaiTemporary edge protection systems - Product specification - Test methods91.220Gradbena opremaConstruction equipment13.340.99Druga varovalna opremaOther protective equipmentICS:Ta slovenski standard je istoveten z:EN 13374:2013+A1:2018SIST EN 13374:2013+A1:2019en,fr,de01-marec-2019SIST EN 13374:2013+A1:2019SLOVENSKI
STANDARD
SIST EN 13374:2013+A1:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13374:2013/A1
December
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s uä u v rä { {â
{ sä t t r Supersedes EN
s u u y vã t r s uEnglish Version
Temporary edge protection systems æ Product specification æ Test methods Gardeæcorps périphériques temporaires æ Spécification du produit æ Méthodes d 5éssai
Temporäre Seitenschutzsysteme æ Produktfestlegungen æ Prüfverfahren This European Standard was approved by CEN on
t s March
t r s u and includes Amendment
s approved by CEN on
t z August
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
9
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 2 Contents Page European foreword . 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 7 4 Classification of edge protection systems . 10 4.1 Class A . 10 4.2 Class B . 11 4.3 Class C . 11 5 Requirements . 11 5.1 General . 11 5.1.1 Basic requirements . 11 5.1.2 Nets . 11 5.1.3 Principal guardrail . 11 5.1.4 Toeboard . 11 5.2 Additional dimensional requirements for individual classes . 12 5.2.1 Edge protection system class A . 12 5.2.2 Edge protection system class B . 12 5.2.3 Edge protection system class C . 12 5.3 Material requirements . 13 5.3.1 General . 13 5.3.2 Steel . 13 5.3.3 Timber . 13 5.3.4 Material for counterweights . 14 5.4 Static and dynamic design requirements for individual classes. 14 5.4.1 General . 14 5.4.2 Edge protection system class A . 14 5.4.3 Edge protection system class B . 14 5.4.4 Edge protection system class C . 14 6 Structural design . 15 6.1 General . 15 6.1.1 Introduction . 15 6.1.2 Method of design . 15 6.1.3 Ultimate limit state (fundamental and accidental loads) . 16 6.1.4 Serviceability limit state . 16 6.2 Partial safety factors . 16 6.2.1 Ultimate limit state with fundamental loads . 16 6.2.2 Serviceability limit state . 17 6.2.3 Ultimate limit state with accidental loads. 17 6.3 Static loads . 17 6.3.1 General . 17 6.3.2 Serviceability limit state . 18 6.3.3 Ultimate limit state – Point loads . 19 6.3.4 Ultimate limit state - Maximum wind load . 20 6.3.5 Ultimate limit state –Load combination. 21 6.3.6 Ultimate limit state - Load parallel to the edge protection system . 22 SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 3 6.3.7 Ultimate limit state with accidental loads . 22 7 Test methods . 23 7.1 General . 23 7.2 Load application . 24 7.3 Sample to be tested . 24 7.4 Tests for conformity with static load requirements for classes A and B . 24 7.4.1 General . 24 7.4.2 Tests for serviceability . 24 7.4.3 Test for strength . 25 7.5 Tests for conformity with dynamic load requirements for classes B and C . 25 7.5.1 Test procedure for Class B !and Class C" . 25 7.5.2 Test procedure for Class C . 28 7.6 Test reports . 30 8 Designation . 30 9 Marking . 30 10 Information to be given to the site . 31 10.1 General requirements . 31 10.2 Principal contents . 31 11 Assessment. 32 Annex A (informative)
Appropriate classes for the use at different inclinations and falling heights . 33 Bibliography . 34
SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 4 European foreword This document (EN 13374:2013+A1:2018) has been prepared by Technical Committee CEN/TC 53 “Temporary works equipment”, the secretariat of which is held by DIN. 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 June 2019, and conflicting national standards shall be withdrawn at the latest by June 2019. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1 approved by CEN on 28 August 2018. This document supersedes EN 13374:2013. The start and finish of text introduced or altered by amendment is indicated in the text by tags !". Temporary edge protection systems are used in construction work, primarily to prevent persons and objects from falling to a lower level from roofs, edges, stairs and other areas where protection is required. In most European countries temporary edge protection, or other types of fall protection devices, are required when a risk assessment identifies a fall risk regardless of height. In contrast to being secured by a lanyard, greater mobility in the working area is provided when edge protection is in place. The temporary edge protection can in some situations also act as a handrail for people to hold onto when working or walking close to an edge. COUNCIL DIRECTIVE 92/57/EEC was taken into consideration when reviewing this product standard. While this standard also includes requirements to protect people from falling objects, e.g. by the provision of toeboards, there could be circumstances where this is insufficient and additional measures, which are beyond the scope of this document, will need to be taken. Classes specified in this standard are intended to cater for the varied requirements appropriate for different uses. It is important that the structure to which temporary edge protection is attached can support the load that the system is designed for. This standard is a revised version of the 2004 version. In general, the following changes have been made: — the normative references have been updated, — most of the figures have been updated, — three tables have been added to clarify design and test requirements, — all testing related information from Clause 5 and 6 have been moved to Clause 7, — subclause 5.3 has been simplified, SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 5 — subclause 6.1.3 has been added, — subclause 6.3 has been clarified with table and pictures, — Clause 7 has been rewritten in most parts, — Annex A has been deleted, the former Annex B is now Annex A; — editorial changes and clarifications have been done. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. 1 Scope This document specifies the requirements and test methods for temporary edge protection systems for use during construction or maintenance of buildings and other structures. This document applies to edge protection systems for flat and inclined surfaces and specifies the requirements for three classes of temporary edge protection. For edge protection systems with an arrest function (e.g. falling or sliding down a sloping roof) this standard specifies requirements for energy absorption. This standard includes edge protection systems, some of which are fixed to the structure and others, which rely on gravity and friction on flat surfaces. This standard does not provide requirements for edge protection systems intended for: — protection against impact from vehicles or from other mobile equipment, — protection from sliding down of bulk loose materials, snow etc, — protection of areas accessible to the public. This standard does not apply to side protection on scaffolds according to EN 12811-1 and EN 1004. NOTE This does not prevent these systems to be used on temporary structures. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 74-1, Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1: Couplers for tubes - Requirements and test procedures EN 74-2, Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 2: Special couplers - Requirements and test procedures EN 74-3, Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 3: Plain base plates and spigot pins - Requirements and test procedures SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 6 EN 338, Structural timber - Strength classes EN 596, Timber structures - Test methods - Soft body impact test of timber framed walls EN 1263-1, Temporary works equipment - Safety nets - Part 1: Safety requirements, test methods EN 1990, Eurocode - Basis of structural design EN 1991-1-4, Eurocode 1: Actions on structures - Part 1-4: General actions - Wind actions EN 1993-1-1, Eurocode 3: Design of steel structures - Part 1-1: General rules and rules for buildings EN 1993-1-2, Eurocode 3: Design of steel structures - Part 1-2: General rules - Structural fire design EN 1993-1-3, Eurocode 3 - Design of steel structures - Part 1-3: General rules - Supplementary rules for cold-formed members and sheeting EN 1993-1-4, Eurocode 3 - Design of steel structures - Part 1-4: General rules - Supplementary rules for stainless steels EN 1993-1-5, Eurocode 3 - Design of steel structures - Part 1-5: Plated structural elements EN 1993-1-6, Eurocode 3 - Design of steel structures - Part 1-6: Strength and Stability of Shell Structures EN 1993-1-7, Eurocode 3 - Design of steel structures - Part 1-7: Plated structures subject to out of plane loading EN 1993-1-8, Eurocode 3: Design of steel structures - Part 1-8: Design of joints EN 1993-1-9, Eurocode 3: Design of steel structures - Part 1-9: Fatigue EN 1993-1-10, Eurocode 3: Design of steel structures - Part 1-10: Material toughness and through-thickness properties EN 1993-1-11, Eurocode 3 - Design of steel structures - Part 1-11: Design of structures with tension components EN 1993-1-12, Eurocode 3 - Design of steel structures - Part 1-12: Additional rules for the extension of EN 1993 up to steel grades S 700 EN 1993-2, Eurocode 3 - Design of steel structures - Part 2: Steel Bridges EN 1993-3-1, Eurocode 3 - Design of steel structures - Part 3-1: Towers, masts and chimneys - Towers and masts EN 1993-3-2, Eurocode 3 - Design of steel structures - Part 3-2: Towers, masts and chimneys - Chimneys EN 1993-4-1, Eurocode 3 - Design of steel structures - Part 4-1: Silos EN 1993-4-2, Eurocode 3 - Design of steel structures - Part 4-2: Tanks EN 1993-4-3, Eurocode 3: Design of steel structures — Part 4-3: Pipelines EN 1993-5, Eurocode 3 - Design of steel structures - Part 5: Piling SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 7 EN 1993-6, Eurocode 3 - Design of steel structures - Part 6: Crane supporting structures EN 1995-1-1, Eurocode 5: Design of timber structures - Part 1-1: General - Common rules and rules for buildings EN 1995-1-2, Eurocode 5: Design of timber structures - Part 1-2: General - Structural fire design EN 1995-2, Eurocode 5: Design of timber structures - Part 2: Bridges EN 1999-1-1, Eurocode 9 — Design of aluminium structures — Part 1-1: General structural rules EN 1999-1-2, Eurocode 9 - Design of aluminium structures - Part 1-2: Structural fire design EN 1999-1-3, Eurocode 9: Design of aluminium structures – Part 1-3: Structures susceptible to fatigue EN 1999-1-4, Eurocode 9 - Design of aluminium structures - Part 1-4: Cold-formed structural sheeting EN 1999-1-5, Eurocode 9 - Design of aluminium structures - Part 1-5: Shell structures EN 12811-3:2002, Temporary works equipment - Part 3: Load testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 edge protection system set of components intended to protect people from falling to a lower level and to retain materials Note 1 to entry: see Figure 1. 3.2 principal guardrail rail or continuous element forming the top of the edge protection system 3.3 intermediate guardrail rail or continuous element between the principal guardrail and the working surface 3.4 intermediate protection protection barrier formed (e.g. as a fencing structure or a safety net) between the principal guardrail and the working surface Note 1 to entry: see Figure 2. 3.5 toeboard upstanding element provided specifically to prevent materials or persons from falling or sliding off a surface 3.6 post principal vertical support of the edge protection system to which the guardrails and toeboards are attached SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 8 Note 1 to entry: Components 3.2 to 3.6 can be manufactured in full or part of an integrated edge protection system. 3.7 falling heigt, Hf vertical distance between the point on which a person may stand and the lowest point on the protection intended to arrest any fall Note 1 to entry: See Figure 3. 3.8 height of the edge protection system distance between the uppermost point of the principal guardrail and the working surface measured perpendicular to the working surface 3.9 working surface surface on which persons stand, walk or work SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 9 3.10 counterweight component to (by its own weight) prevent the edge protection system from sliding or from overturning Note 1 to entry: Figure 1 illustrates some of the various types of edge protection.
Key 1 slab edge clamp system 6 beam bottom flange clamp system 2 fixed to floor type system 7 column clamp system – sloping roof 3 counterweighted system 8 fencing system 4 beam top flange clamp system 9 edge protection on temporary structure 5 column clamp system – slabs and flat/low sloping roofs 10 temporary structure (not defined in this standard) Figure 1 — Diagrammatic examples of different types of temporary edge protection SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 10
Figure 2 — Example of an edge protection system with a net as intermediate protection on a sloping roof
Key Hf
falling height
angle of inclination of the working surface 1 edge protection system Figure 3 — Falling height on an inclined surface 4 Classification of edge protection systems 4.1 Class A Class A protection provides resistance to static loads only, based on the requirements to: — support a person leaning on the protection or provide a handhold when walking beside it; and — collectively stop a person who is walking or falling towards the protection. SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 11 4.2 Class B Class B protection provides resistance to static loads and low dynamic actions only, based on the requirements to: — support a person leaning on the protection or provide a handhold when walking beside it; and — collectively stop a person who is walking or falling towards the protection; — collectively stop a person sliding/falling down a sloping surface. 4.3 Class C Class C protection provides resistance to high dynamic forces based on the safety requirements to prevent the fall of a person sliding down a steep sloping surface. — Collectively stop a person sliding/falling down a steep sloping surface. NOTE More guidance about the use of classes is given in Annex A. 5 Requirements 5.1 General 5.1.1 Basic requirements An edge protection system shall consist of a principal guardrail and either an intermediate guardrail or an intermediate protection. It shall also be possible to attach a toeboard. All components in the system shall be designed to avoid accidental removal or displacement of any component in any direction during use. The components shall be designed and manufactured so that injury to persons from puncturing or lacerating of the skin is prevented. NOTE
An edge protection system can be manufactured as an integrated unit. 5.1.2 Nets Safety nets used in edge protection systems shall be in accordance with EN 1263-1. The fixing of each net shall satisfy the load requirements of the intended class or classes. Nets shall be installed in tension to avoid slackness. 5.1.3 Principal guardrail The distance between the uppermost part of the principal guardrail and the working surface shall be at least 1 000 mm, at any point, measured perpendicular to the working surface, see Figure 4 and 5. The principal guardrails shall be continuous and any horizontal gaps shall be less than 120 mm. 5.1.4 Toeboard The distance between the uppermost part of the toeboard and the working surface shall be at least 150 mm, at any point, measured perpendicular to the working surface, see Figure 4 and 5. The toeboard shall be designed to avoid gaps between it and the working surface. If there are gaps, a sphere with a diameter of 20 mm shall not pass through them. For other situations for example where the working surface is not flat, any gaps should be maintained as small as practicable. SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 12 5.2 Additional dimensional requirements for individual classes Dimensions in millimetres
Figure 4 — Dimensional height and spacing of edge protection components 5.2.1 Edge protection system class A !The inclination of edge protection system class A shall not deviate from the vertical by more than 15°, outwards or inwards." If an intermediate guardrail is provided, any gap shall be so dimensioned that a sphere of 470 mm diameter will not pass through the protection, see Figure 4. If there is no intermediate guardrail or if it is not continuous, the edge protection system shall be so dimensioned that a sphere with a diameter of 250 mm will not pass through it. 5.2.2 Edge protection system class B !The inclination of edge protection system class B shall not deviate from the vertical by more than 15°, outwards or inwards." Any gap in a class B edge protection shall be so dimensioned that a sphere of 250 mm diameter will not pass through the protection. 5.2.3 Edge protection system class C The inclination of the edge protection shall be between the vertical line AC of Figure 5, and a line perpendicular to the surface, line BC. Gaps in class C edge protection shall be dimensioned so that a sphere with a diameter of 100 mm will not pass through them. SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 13 Dimensions in millimetres
Key AC vertical line BC line perpendicular to working surface
angle of inclination of the working surface Figure 5 — The inclination of the edge protection system 5.3 Material requirements 5.3.1 General Materials shall fulfil the requirements given in relevant European Standards, where design data is provided. Other materials shall be in accordance with appropriate European Standards. If European Standards do not exist, ISO Standards may be applied. Materials shall be sufficiently robust and durable to withstand normal working conditions. Materials shall be free from any impurities and defects, which may affect their satisfactory use. Information about the most commonly used materials is given in EN 12811-2. Material requirements for nets are given in EN 1263-1. When materials are used, whose properties in relation to the intended application (e.g. temperature, ageing, UV-degradation) are not given in any available standard an adequate assessment is required in order to fulfil the requirements of this standard. Requirements for couplers are given in EN 74 parts 1 to 3. Couplers and tubes used shall be tested and proven for function and compliance with the standard. 5.3.2 Steel Steels of deoxidation type FU (rimming steels) shall not be used. Information on common types of corrosion protection is given in EN 12811-2. 5.3.3 Timber Timber shall be strength graded in accordance with EN 338 to have a minimum classification of C16. If a protective coating is used, it shall not impede the visual inspection of the material. SIST EN 13374:2013+A1:2019
EN 13374:2013+A1:2018 (E) 14 Plywood shall have good durability with regard to climatic conditions. 5.3.4 Material for counterweights The materials employed shall be solid within the usual range of temperature. Granulated or fluid materials such as sand or water shall not be used. Each counterweight shall be capable of being pos
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