SIST EN 15027:2008+A1:2009
(Main)Transportable wall saw and wire saw equipment for job site - Safety
Transportable wall saw and wire saw equipment for job site - Safety
The global description "wall saw and wire saw equipment" contains two differing types of machines for use in the construction industry, and both used to make cuts on walls, ceilings and floors composed of mineral construction materials and/or composite materials. The many different cutting tasks and choice of operating method determine the type of machine to be used for each application.
The machines may therefore be split into the following two principal classifications:
- Wall saws - exclusively rail guided - transportable.
- Wire saws - transportable.
The machines are intended for the use of diamond tools. The types of cutting tools used in conjunction with the machines as described above fall within the design and use parameters supplied by the manufacturer.
Cutting debris generated by the cutting action is removed from the cutting joint by a medium such as water directed to the cutting tool.
Machines covered by this standard may be powered by: electric motor, IC engine, electro-hydraulic drive and IC engine-hydraulic drive.
This European Standard deals with all significant hazards, hazardous situations and events relevant to wall saws and wire saws machinery, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Clause 4).
This standard specifies the appropriate technical measures to eliminate or reduce risks arising from the significant hazards generated by the cutting process work cycle.
For special applications, for example, when working in potentially explosive atmospheres, additional safety requirements is necessary which are not covered by this standard.
This European Standard does not apply for wire saws intended for quarrying and stationary machining of natural stone as covered by prEN 15163.
This European Standard applies primarily to machines which are manufactured after the date of approval by CEN of this standard.
Transportable Wand- und Seilsägen für den Baustelleneinsatz - Sicherheit
Die allgemeine Bezeichnung „Wand- und Seilsägen“ beinhaltet zwei unterschiedliche Typen von Maschinen für den Einsatz in der Bauindustrie, die beide dazu verwendet werden, Schnitte in Wände, Decken und Böden vorzunehmen, die aus mineralischen Baumaterialien und/oder Verbundmaterialien bestehen. Die Vielzahl der unterschiedlichen Schneidaufgaben und die Auswahl des geeigneten Verfahrens bestimmen den für die jeweilige Anwendung einzusetzenden Maschinentypen.
Die Maschinen können deshalb in die folgenden zwei Hauptkategorien unterteilt werden:
Wandsägen – ausschließlich schienengeführt – transportabel.
Seilsägen – transportabel.
Die Maschinen sind zum Einsatz mit Diamantwerkzeugen vorgesehen. Die Typen von Schneidwerkzeugen, die bei den oben beschriebenen Maschinen einzusetzen sind, werden durch die vom Hersteller vorgegebenen Konstruktions- und Anwendungsparameter bestimmt.
Während des Schneidvorgangs erzeugte Bruchstücke werden aus dem Schneidschlitz mittels eines auf das Schneidwerkzeug gerichteten Mediums, wie z. B. Wasser, entfernt.
Die Maschinen, die durch diese Norm abgedeckt sind, können wie folgt angetrieben werden: Elektromotor, Verbrennungsmotor, elektrohydraulischer Antrieb oder hydraulischer Antrieb über einen Verbrennungsmotor.
Diese Norm behandelt alle signifikanten Gefährdungen, Gefährdungssituationen und Gefährdungsereignisse, die auf Wand- und Seilsägen für den Baustelleneinsatz zutreffen, wenn sie bestimmungsgemäß verwendet werden. Die nach vernünftigem Ermessen für den Hersteller vorhersehbare Nutzung der Maschine außerhalb der bestimmungsgemäßen Verwendung ist ebenfalls berücksichtigt (siehe Abschnitt 4).
Diese Norm spezifiziert die entsprechenden technischen Maßnahmen zur Beseitigung oder Verminderung der Risiken, die von den signifikanten Gefährdungen ausgehen, die durch den Schneidevorgang erzeugt werden.
Scies murales et scies à fil transportables de chantier - Sécurité
La désignation générale «scies murales et scies à fil transportables de chantier» englobe des machines de
deux types différents utilisées dans l'industrie du bâtiment, les machines des deux types servant à pratiquer des
entailles dans les murs, les plafonds et les planchers composés de matériaux de construction minéraux et/ou de
matériaux composites. Les nombreuses tâches de coupe différentes et le choix de la méthode de fonctionnement
déterminent le type de machine à utiliser pour chaque application.
Les machines peuvent donc être réparties dans les deux grandes classes suivantes :
— scies murales — exclusivement guidées par rail — transportables ;
— scies à fil — transportables.
Les machines sont destinées à l’utilisation d’outils diamantés. Les types d'outils de coupe utilisés conjointement avec
les machines décrites ci-dessus entrent dans le cadre des paramètres de conception et d'utilisation communiqués
par le fabricant.
Les chutes engendrées par l'action de coupe sont enlevées du joint de coupe par un milieu tel que de l'eau, dirigé
sur l'outil de coupe.
Les machines couvertes par la présente norme peuvent être alimentées par un moteur électrique, un moteur à
combustion interne, par un entraînement électro-hydraulique ou par un moteur à combustion interne à entraînement
hydraulique.
La présente Norme européenne traite tous les phénomènes dangereux, situations et événements dangereux
significatifs spécifiques aux scies murales et aux scies à fil transportables de chantier lorsqu’elles sont utilisées
normalement et dans les conditions de mauvais usages raisonnablement prévisibles par le fabricant (voir Article 4).
La présente norme spécifie les mesures techniques appropriées permettant d'éliminer ou de réduire les risques
provenant des phénomènes dangereux significatifs engendrés par le cycle de travail du processus de coupe.
Oprema za prenosne stenske in žične žage za delovišča - Varnost
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Transportable Wand- und Seilsägen für den Baustelleneinsatz - SicherheitScies murales et scies à fil transportables de chantier - SécuritéTransportable wall saw and wire saw equipment for job site - Safety91.220Gradbena opremaConstruction equipment25.080.60Strojne žageSawing machinesICS:Ta slovenski standard je istoveten z:EN 15027:2007+A1:2009SIST EN 15027:2008+A1:2009en,fr01-maj-2009SIST EN 15027:2008+A1:2009SLOVENSKI
STANDARD
SIST EN 15027:2008+A1:2009
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15027:2007+A1
March 2009 ICS 25.080.60; 91.220 Supersedes EN 15027:2007English Version
Transportable wall saw and wire saw equipment for job site - Safety
Scies murales et scies à fil transportables de chantier - Sécurité
Transportable Wand- und Seilsägen für den Baustelleneinsatz - Sicherheit This European Standard was approved by CEN on 7 October 2007 and includes Amendment 1 approved by CEN on 15 February 2009.
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, 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 © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15027:2007+A1:2009: ESIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 2 Contents Page Foreword .4Introduction .51Scope .62Normative references .63Terms and definitions .74List of significant hazards . 115Safety requirements and/or measures . 125.1General . 125.2Mechanical hazards . 135.2.1General . 135.2.2Protection against moving parts . 135.2.3Stability . 145.2.4Transport and handling . 145.2.5Fixing of the cutting tool . 145.2.6Manual starting . 145.2.7Guiding systems . 155.2.8Control devices . 155.2.9Failure of power supply . 155.3Electrical hazards . 165.4Thermal hazards . 165.5Exhaust fumes (internal combustion engines) . 165.6Hydraulic and pneumatic installations . 165.6.1Hydraulic installations . 165.6.2Pneumatic installations . 175.6.3Hoses and pipes under pressure . 175.7Fluid containers . 175.8Cutting debris and dust emission . 175.9Rotational speed . 175.10Noise reduction at design stage . 175.11Maintenance . 186Verification of safety requirements and/or measures . 187Information for use . 187.1General . 187.2Marking . 187.2.1Regular marking. 187.2.2Other information. 197.2.3Warning about residual risks . 197.3Accompanying documents . 197.3.1General . 197.3.2Operator's instructions . 197.3.3Maintenance instructions . 227.3.4Spare parts list . 23Annex A (normative)
Noise test code – Grade 2 of accuracy . 24A.1General . 24A.2Measurement of the A-weighted emission sound pressure level at the work station . 24A.3Determination of the A-weighted sound power level emitted by the machine . 24A.4Operating conditions . 24SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 3 A.5Information to be recorded . 25A.6Information to be reported. 25A.7Noise declaration by the manufacturer . 25Annex B (normative)
Requirements for cutting-off wheel and wire guards . 27B.1General . 27B.2Tool guards for wall saws. 27B.3Tool guard for wire saws . 28Annex C (normative)
Pictograms . 30Annex D (normative)
Verification of surface temperature . 31D.1Test equipment . 31D.2Test method . 31D.3Test acceptance . 31Annex E (informative)
Examples for working areas and dangerous areas for wire saws . 32Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC . 35Annex ZB (informative)
!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC" . 36Bibliography . 37 Figures Figure 1 — Components of a wall saw . 8Figure 2 — Components of a wire saw . 10Figure B.1 — Wall saw – Tool guard . 27Figure B.2 — Wire saw – Tool guard . 28Figure C.1 — “Caution, risk of cutting” . 30Figure
C.2 — "Read operator’s instructions" (see ISO 7000:2004) . 30Figure C.3 — “Ear Hearing protection shall be worn” . 30Figure C.4 — “Eye protection shall be worn” . 30Figure C.5 — “Hand protection shall be worn“ . 30Figure D.1 — Test cone to detect hot surface . 31Figure E.1 — Danger zones for wall cutting with additional wire guiding devices . 32Figure E.2 — Danger zones for wall cutting without additional wire guiding devices . 33Figure E.3 — Danger zones for floor cutting . 34Tables Table 1 — List of significant hazards . 12Table B.1 — Minimum thickness of tool guard parts for wall saws . 28Table B.2 — Minimum thickness of tool guard parts for wire saws . 29 SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 4 Foreword This document (EN 15027:2007+A1:2009) has been prepared by Technical Committee CEN/TC 151 “Construction equipment and building material machines — Safety”, 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 September 2009, and conflicting national standards shall be withdrawn at the latest by December 2009. This document includes Amendment 1, approved by CEN on 2009-02-15. This document supersedes EN 15027:2007. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". 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 Annexes ZA and ZB, which are integral parts of this document." 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 United Kingdom.
SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 5 Introduction This document is a type C standard as stated in EN ISO 12100-1:2003. 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. It is intended to revise this standard to align with changes in legislation and the availability of other European Standards in preparation. SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 6
1 Scope The global description “wall saw and wire saw equipment” contains two differing types of machines for use in the construction industry, and both used to make cuts on walls, ceilings and floors composed of mineral construction materials and/or composite materials. The many different cutting tasks and choice of operating method determine the type of machine to be used for each application. The machines may therefore be split into the following two principal classifications: Wall saws – exclusively rail guided – transportable. Wire saws – transportable. The machines are intended for the use of diamond tools. The types of cutting tools used in conjunction with the machines as described above fall within the design and use parameters supplied by the manufacturer. Cutting debris generated by the cutting action is removed from the cutting joint by a medium such as water directed to the cutting tool. Machines covered by this standard may be powered by: electric motor, IC engine, electro-hydraulic drive and IC engine-hydraulic drive. This European Standard deals with all significant hazards, hazardous situations and events relevant to wall saws and wire saws machinery, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Clause 4). This standard specifies the appropriate technical measures to eliminate or reduce risks arising from the significant hazards generated by the cutting process work cycle. For special applications, for example, when working in potentially explosive atmospheres, additional safety requirements is necessary which are not covered by this standard. This European Standard does not apply for wire saws intended for quarrying and stationary machining of natural stone as covered by !EN 15163". This European Standard applies primarily to machines which are manufactured after the date of approval by CEN of this standard. 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. !deleted text" EN 573-3:2007, Aluminium and aluminium alloys — Chemical composition and form of wrought products — Part 3: Chemical composition !EN 953", Safety of machinery — Guards — General requirements for the design and construction of fixed and movable guards EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Hydraulics SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 7 EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Pneumatics !EN 10111:2008", Continuously hot-rolled low carbon steel sheet and strip for cold forming — Technical delivery conditions EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:2005, modified) EN 61029-1:2000, Safety of transportable motor-operated electric tools — Part 1: General requirements
(IEC 61029-1:1990, modified) EN ISO 3744:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994) EN ISO 11201:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Engineering method in an essentially free field over a reflecting plane (ISO 11201:1995) 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 13732-1:2006, 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 13849-1:2006, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1:2006) EN ISO 13850:2006, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006) !EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and lower limbs (ISO 13857:2008)" 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 and the following apply. 3.1 wall saw transportable machine utilising a diamond cutting-off wheel, for sawing primarily on walls, floors and ceilings. A wall saw is powered by an integral or an external power source as described in Clause 1. Feed and depth of cut can be adjusted/operated manually or by remote control NOTE The components of a wall saw are shown in Figure 1. 3.2 wire saw transportable machine utilising a diamond wire, for sawing primarily on walls, floors and ceilings. A wire saw is powered by an integral or an external power source as described in Clause 1. The machine is operated by remote control NOTE The components of a wire saw are shown in Figure 2. SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 8
3.3 components of wall saws
Key
1 cutting head
2 drive motor hydraulic/drive motor electric
3 tool protection/blade guard
4
track guiding system
5 mounting devices
6 remote control system
7 feed system
8 depth control
9 power source
10 power transmission
11 tool mounting device
12 diamond tool
13
coolant supply
Figure 1 — Components of a wall saw SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 9 3.3.1 cutting head cutting head for wall saws powered by an internal or external power source incorporates the mounting device for the diamond cutting tool (e. g. flange, arbour), the cutting tool driving device, feeding and depth control device and the protective/safety devices to afford protection to the operator or site personnel. It incorporates a specific device to be mounted and guided on the track 3.3.2 track guiding system track guiding system for wall saws is mounted in relation to the surface to be cut by means of fixing elements. It guides the cutting head during the working process and is designed to withstand the imparted stresses. It incorporates end stops to retain the cutting head at the track ends 3.3.3 cutting tool rotating diamond tool(s) to perform the cutting operation 3.3.4 tool mounting device device (e. g. flange) for wall saws to securely hold the cutting tool on the cutting head during the cutting operation 3.3.5 clamping flange system clamping flange system for wall saws consists of two plates with concentric tool seat. They are spanned by a locking device 3.3.6 flush cut flange system flush cut flange system for wall saws consists of a single flange with concentric tool seat and a fixing device in order to mount the tool 3.3.7 tool protection guard guard which encloses non-working parts of the cutting tool 3.3.8 power supply unit unit supplying electric or hydraulic power required in order to perform the specific cutting operation SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 10 3.4 components of a wire saw
Key
1 wire drive unit
2 tool protection/guards
3 power source
4 remote control
5 power and coolant transmission
6 feed system
7 wire guiding device
8 wire drive wheel
9 wire storage
10 diamond tool (wire)
Figure 2 — Components of a wire saw 3.4.1 wire drive unit drive unit for wire saws powered by an internal or external power source incorporates the driving wheel(s) for the diamond wire, feeding and tensioning device and the protective/safety devices to afford protection to the operator or site personnel. It may incorporate a wire storage and guiding device 3.4.2 wire guiding devices device(s) which can be mounted in the vicinity of the surface to be cut in order to guide the wire during the cutting operation 3.4.3 cutting tool flexible circulating tool consisting of a core (wire rope) fitted with diamond impregnated beds (cutting rings) 3.4.4 power supply unit unit supplying electric or hydraulic power required in order to perform the specific cutting operation SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 11 3.5 rated speed maximum speed of the rotating spindle in revolutions per minute at the rated conditions specified by the manufacturer without cutting tool and under no load 3.6 nominal mass mass of the machine components as defined in the instruction manual but without cutting tool. All tanks empty 4 List of significant hazards This clause contains all hazards and hazardous situations and events, as far as they are dealt with in this European Standard, identified by risk assessment as significant for this type of machinery and which require action to eliminate or reduce the risk. SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 12 Table 1 — List of significant hazards
Hazards Concerned subclauses 4.1 Crushing hazard 5.2.1, 5.2.2, 5.2.4, 5.2.5, 5.2.7 4.2 Shearing hazard 5.2.1, 5.2.2, 5.2.4, 5.2.5, 5.2.7 4.3 Cutting and severing hazard 5.2.1, 5.2.2, 7.3.2 4.4 Entanglement hazard 5.2.1, 5.2.2, 7.3.2 4.5 Drawing in or trapping hazard 5.2.1, 5.2.2, 7.3.2 4.6 Impact hazard 5.2.1, 5.2.2, 5.2.6, 7.3.2 4.7 Fluid injection hazard 5.6 4.8 Hazards caused by ejection of parts, material, lash of bands etc. 5.2.1, 5.2.2, 5.2.5, 5.2.6, 5.9, 7.3.2, 7.3.2.3, Annex B 4.9 Hazards caused by loss of stability 5.2.3, 7.3.2 4.10 Slip, trip and fall hazard in relation with machine 5.7, 7.3.2 4.11 Hazards caused by electrical contact direct/indirect 5.3 4.12 Hazards resulting in burns or scalds, by possible contact of persons by flames, explosion and radiation of heat sources. 5.4, Annex D 4.13 Hearing loss, physiological disorders, interference with speech communication and auditory danger signals 5.10, 7.3.2, Annex A 4.14 Hazards resulting from contact with or inhalation of harmful fluids, gases, mists, fumes and dusts. 5.5, 5.8, 7.3.2 4.15 Hazards caused by fire or explosion. 5.11, 7.3.2 4.16 Hazard combinations 5 4.17 Hazard caused by failure of energy supply or control circuits 5.2.8, 5.2.9 4.18 Hazards caused by failure or malfunction of control system 5.2.8 4.19 Hazards caused by assembly errors 7.3.2, 7.3.3 4.20 Hazards caused by temporary missing or incorrectly positioned safety related measures such as: -
4.20.1 Guards of all kinds 5.2.2 4.20.2 Safety related protection devices of all kinds 5.2.2 4.20.3 Starting and stopping devices 5.2.8 4.20.4 Safety signs and tags 7.2.3, 7.3.2, Annex C 4.20.5 Information and warning devices of all kinds 7.2.2 4.20.6 Essential equipment and accessories for safe adjusting and maintenance 7.2.2 !6.1 Low frequency, radio frequency radiation, micro waves 5.3, 7.3.2.3" 5 Safety requirements and/or measures 5.1 General Machinery shall comply with the safety requirements and/or measures of this clause and in addition with EN ISO 12100-1:2003 and EN ISO 12100-2:2003 for hazards which are relevant but not significant and which are not dealt with in this standard. The application of the reference standards !EN ISO 13857:2008", !EN 953" used in this standard refers only to the operation of intended elements (see also 7.3.2.3). SIST EN 15027:2008+A1:2009
EN 15027:2007+A1:2009 (E) 13 5.2 Mechanical hazards 5.2.1 General As components and parts have to be manually handled, all accessible parts, the cutting tool excepted, shall be free of sharp edges and burrs which could generate hazards when setting up, using, handling and maintaining the machine. Burrs from, for example, manufacturing, casting and welding shall be eliminated, sharp edges shall be smoothed. 5.2.2 Protection against moving parts 5.2.2.1 Moving parts not involved in the working process Rotating transmission parts, for example, couplings and drive shafts shall be provided with fixed guards to prevent contact. !Guards shall comply with EN 953 and 5.3.2.2 of EN ISO 12100-2:2003." Fixed guards shall be used and be held in position either by welding or mounting them in such a way that they can only be opened or removed only with the aid of tools or keys. !deleted text" 5.2.2.2 Moving parts involved in the working process 5.2.2.2.1 General The guards for the protection against contact with the tool and its driving and guiding devices shall be so designed and robust enough to resist strains resulting from an accidental projection of fragments of the cutting tool. Brittleness of the guard material shall be taken into account. Permanent plastic deformation of the guard resulting from stress shall be allowed. Requirements for the strength of cutting-off wheel and wire guards are specified in Annex B. The existence of a device stopping the cutting-off wheel is not necessary, when the absence or the opening of the guard creates a projection of water, which prevents an intended use of the machine. 5.2.2.2.2 Wall saws The upper part of the cutting tool and its fixing shall be covered with a fixed guard to avoid inadvertent contact and designed with sufficient strength to protect against ejection of fragments of the tool, water, the material to be cut and take into account that the machine may be remotely controlled by the operator. The mountin
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