SIST EN 12043:2002+A1:2011
(Main)Food processing machinery - Intermediate provers - Safety and hygiene requirements
Food processing machinery - Intermediate provers - Safety and hygiene requirements
This standard specifies safety and hygiene requirements for the design and manufacture of intermediate provers with moving pocket carriers as described in Clause 3 used in the food industry, pastry-making, bakeries, etc. for giving a resting time to dough between dividing and moulding processes. This European Standard specifies all significant hazards, hazardous situations and events relevant to the installation, adjustment, operation, cleaning, maintenance, dismantling, disabling and scrapping of intermediate provers with moving pocket carriers when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer. The significant hazards covered by the standard are mechanical (shearing, trapping, cutting, loss of stability), electrical, ergonomic and also those resulting from inhalation of flour dust and lack of hygiene. Noise is not considered to be a significant hazard from intermediate provers. This does not mean that the manufacturer of the machine is absolved from reducing noise and making a noise declaration. Therefore a noise test code is proposed in Annex B. The following machines are excluded: - rack provers; - experimental and testing machines under development by the manufacturer. This standard is not applicable to intermediate provers with moving pocket carriers which are manufactured before the date of its publication as EN.
Nahrungsmittelmaschinen - Zwischengärschrank - Sicherheits-und Hygieneanforderungen
Diese Norm legt die Sicherheits- und Hygieneforderungen an die Gestaltung und den Bau von Bärunterbrechern mit sich bewegenden Taschenträgern fest, die in der Nahrungsmittelindustrie, in Bäckereien, Konditoreien etc. zum Einsatz kommen, um dem Teig eine Ruhezeit zwischen den Teil- und Formvorgängen zu geben. Diese Norm umfaßt die in Abschnitt 3.12 von EN 292-1 und in der Betriebsanleitung des Herstellers definierten technischen Sicherheitsanforderungen für die Installation, das Einrichten, die Bedienung, Reinigung und Wartung dieser Maschinen.
Machines pour les produits alimentaires - Chambres de repos - Prescriptions relatives à la sécurité et à l'hygiène
La présente norme spécifie les prescriptions de sécurité et d'hygiène relatives à la conception et à la fabrication des chambres de repos à balancelles mobiles utilisées dans les industries alimentaires, boulangeries, pâtisseries, etc. afin de donner à la pâte un temps de détente entre la division et le façonnage. La norme couvre les prescriptions techniques de sécurité relatives à l'installation, au réglage, au fonctionnement, au nettoyage et à la maintenance de ces machines telles que les définissent le paragraphe 3.12 de la norme EN 292-1 et la notice d'instructions du constructeur.
Stroji za predelavo hrane - Komore za vmesno počivanje testa - Varnostne in higienske zahteve (vključno z dopolnilom A1)
Ta standard določa varnostne in higienske zahteve za načrtovanje in proizvodnjo komor za vmesno počivanje testa s premikajočimi se nosilci s košaricami, kot opisano v klavzuli 3, ki se uporabljajo v prehrambeni industriji, pri izdelavi peciva, v pekarnah itd., ter zagotavljajo počivanje testa med postopkom deljenja in gnetenja. Ta evropski standard določa vse velike nevarnosti, nevarne situacije in dogodke, pomembne za postavitev, prilagoditev, delovanje, čiščenje, vzdrževanje, razstavljanje, izklapljanje in uničenje komor za vmesno počivanje testa s premikajočimi se nosilci kotlov, kadar se uporabljajo, kot je predvideno in pod pogoji napačne uporabe, ki jih razumno predvidi proizvajalec. Velike nevarnosti, zajete s tem standardom, so mehanske (striženje, priščipnjenje, rezanje in izguba stabilnosti), električne, ergonomske in prav tako tiste, ki so posledica vdihavanja prahu moke in pomanjkanja higiene. Hrup ne šteje kot velika nevarnost iz komor za vmesno počivanje testa. To ne pomeni, da je proizvajalec stroja oproščen zmanjševanja hrupa in priprave označbe hrupa. Zato je preskusna koda hrupa predlagana v Dodatku B. Izvzeti so naslednji stroji: - komore za počivanje testa s košaricami in preskusni stroji, ki jih razvija proizvajalec. Ta standard ne velja za komore za vmesno počivanje testa s premikajočimi se nosilci s košaricami, ki so izdelane pred datumom njegove objave v obliki EN.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Nahrungsmittelmaschinen - Zwischengärschrank - Sicherheits-und HygieneanforderungenMachines pour les produits alimentaires - Chambres de repos - Prescriptions relatives à la sécurité et à l'hygièneFood processing machinery - Intermediate provers - Safety and hygiene requirements67.260Tovarne in oprema za živilsko industrijoPlants and equipment for the food industryICS:Ta slovenski standard je istoveten z:EN 12043:2000+A1:2010SIST EN 12043:2002+A1:2011en,fr,de01-januar-2011SIST EN 12043:2002+A1:2011SLOVENSKI
STANDARDSIST EN 12043:20021DGRPHãþD
SIST EN 12043:2002+A1:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12043:2000+A1
September 2010 ICS 67.260 Supersedes EN 12043:2000English Version
Food processing machinery - Intermediate provers - Safety and hygiene requirements
Machines pour les produits alimentaires - Chambres de repos -Prescriptions relatives à la sécurité et à l'hygiène
Nahrungsmittelmaschinen - Zwischengärschrank - Sicherheits-und Hygieneanforderungen This European Standard was approved by CEN on 3 July 2000 and includes Amendment 1 approved by CEN on 12 August 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 12043:2000+A1:2010: ESIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 2 Contents Foreword . 3Introduction . 41Scope . 52Normative references . 53!!!!Terms, definitions and description"""" . 63.1!!!!Terms and definitions"""" . 63.2!!!!Description"""" . 64!!!!List of significant hazards"""" . 74.1!!!!General"""" . 74.2Mechanical hazards . 74.3Electrical hazards . 104.4Hazards resulting from inhalation of dust . 104.5Hazard generated by neglecting hygienic design principles . 104.6Hazards generated by neglecting ergonomic principles . 105!!!!Safety and hygiene requirements and/or protective measures"""" . 115.1!!!!General"""" . 115.2Mechanical hazards . 115.3!!!!Electrical hazards"""". 195.4Protection against dust emission . 205.5Hygiene requirements . 205.6Hazards generated by neglecting ergonomic principles . 226!!!!Verification of safety and hygiene requirements and/or protective measures"""" . 227Information for use . 237.1!!!!General"""" . 237.2!!!!Instruction handbook"""" . 237.3Marking . 24Annex A (normative)
Principles of design to ensure the cleanability of intermediate provers . 25A.1Definitions . 25A.2Materials of construction . 25A.3Design . 27Annex B (normative)
Noise test code Grade 2 of accuracy . 46B.1Definitions . 46B.2Installation and mounting conditions . 46B.3Operating conditions . 46B.4Emission sound pressure level determination . 46B.5Measurement uncertainties . 47B.6Information to be recorded . 47B.7Information to be reported . 47B.8Declaration and verification of noise emission values . 47Annex ZA (informative)
!!!!Relationship between this European Standard and the
Essential Requirements of EU Directive 2006/42/EC"""" . 48Bibliography . 49 SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 3 Foreword !This document (EN 12043:2000+A1:2010) has been prepared by Technical Committee CEN/TC 153 “Machinery intended for use with foodstuffs and feed”, 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 March 2011, and conflicting national standards shall be withdrawn at the latest by March 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1, approved by CEN on 2010-08-12. This document supersedes EN 12043:2000. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". 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." 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 United Kingdom.
SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 4 Introduction !This European Standard 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 European Standard. 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." SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 5 1 Scope This standard specifies safety and hygiene requirements for the design and manufacture of intermediate provers with moving pocket carriers !as described in Clause 3" used in the food industry, pastry-making, bakeries, etc. for giving a resting time to dough between dividing and moulding processes. !This European Standard specifies all significant hazards, hazardous situations and events relevant to the installation, adjustment, operation, cleaning, maintenance, dismantling, disabling and scrapping of intermediate provers with moving pocket carriers when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Clause 4)." The significant hazards covered by the standard are mechanical (shearing, trapping, cutting, loss of stability), electrical, ergonomic and also those resulting from inhalation of flour dust and lack of hygiene. Noise is not considered to be a significant hazard from intermediate provers. This does not mean that the manufacturer of the machine is absolved from reducing noise and making a noise declaration. Therefore a noise test code is proposed in Annex B. !deleted text" The following machines are excluded: rack provers; experimental and testing machines under development by the manufacturer. !This standard is not applicable to intermediate provers with moving pocket carriers which are manufactured before the date of its publication as EN." 2 Normative references !The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 294:1992, Safety of machinery — Safety distance to prevent danger zones being reached by the upper limbs EN 614-1:2006+A1:2009, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general principles EN 953:1997+A1:2009, Safety of machinery — Guards — General requirements for the design and construction of fixed and movable guards EN 954-1:1996, Safety of machinery — Safety related parts of control systems — Part 1: General principles for design EN 1088:1995+A2:2008, Safety of machinery — Interlocking devices associated with guards — Principles for design and selection EN 1672-2:2005+A1:2009, Food processing machinery — Basic concepts — Part 2: Hygiene requirements EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:2005, modified) EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 6 EN ISO 3743-1:2009, Acoustics — Determination of sound power levels of noise sources — Engineering methods for small, movable sources in reverberant fields — Part 1: Comparison method for hard-walled test rooms (ISO 3743-1:1994) EN ISO 3744:2009, 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 4287:1998, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters (ISO 4287:1997) EN ISO 4871:2009, Acoustics — Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996) EN ISO 11201:2009, 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, including Cor 1:1997) EN ISO 11688-1:2009, Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 1: Planning (ISO/TR 11688-1:1995) EN ISO 12001:2009, Acoustics — Noise emitted by machinery and equipment — Rules for the drafting and presentation of a noise test code (ISO 12001:1996) 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 13849-1:2008, Safety of machinery — Safety related parts of control systems — Part 1: General principles for design (ISO 13849-1:2006)" ! 3 Terms, definitions and description 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 apply. 3.2 Description
As shown in Figure 1, an intermediate prover consists of: a variable number of fixed or hinged pockets supported in a carrier into which dough pieces are loaded. One pocket may hold more than one dough piece; a mechanical transfer system moving the pocket carrier along a fixed path inside the machine; a frame supporting or containing the transmission machinery." The following features may also be included: an automatic device to control the temperature and/or humidity inside the machine; a flour dusting device; SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 7 other accessories e.g. germicidal lamp (device to prevent the formation of mould - generally an ultraviolet lamp), pocket drier (device to dry the pockets - generally an infra-red lamp or a ventilation system with or without heating ). The resting time is the period of time from loading until discharge of a single pocket. This time can be fixed or variable. There are openings in the frame where dough portions are introduced into the machine (loading) and where they are taken out (discharge). The position of loading and discharge depends on the frame shape and the path of movement of the pockets. Some machines may have more than one discharge. These machines may provide different resting times depending on which of the discharges is being used. There are two main types of intermediate provers. These are differentiated by the type of feeding which can be either manual or automatic. Automatically fed machines may be loaded one portion of dough at a time, or the full carrier can be loaded, be it gutter or pocket shaped. When the full carrier is loaded, the automatic loading device can be either internal or external. The discharge of the machine may also be manual or automatic. When the discharge is manual, the dough portions are taken out from the pockets by hand through an opening in the frame. In some cases this aperture may be the same one used to load the machine. The movement of the pockets may be continuous or intermittent. In some cases, access to the path of movement of the pockets, in addition to the loading and discharge openings, is provided. 4 !!!!List of significant hazards"""" ! 4.1 General This clause contains all the significant hazards, hazardous situations and events, as far as they are dealt with in this Standard, identified by risk assessment as significant for this type of machinery, and which require action to eliminate or reduce the risks." 4.2 Mechanical hazards The significant mechanical hazards are: shearing hazard; trapping hazard; cutting hazard; loss of stability. The examples in Figure 1 illustrate the danger zones associated with these hazards: SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 8 Zone 1: zone of loading and unloading of the dough portions, hazards of shearing, trapping; Zone 2: drive mechanisms, hazards of shearing, trapping, cutting; Zone 3: carrier transfer system (except zone 1), hazards of shearing, trapping; Zone 4: zone covered by moving parts of the flour duster (if fitted), hazards of shearing, trapping; Zone 5: fan with or without heating device, hazards of cutting, burns.
Figure 1 a) Front loading, side unloading
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Figure 1 b) Front loading, rear unloading
Figure 1 c) Front loading, front unloading
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Figure 1 d) Manual loading and unloading in the same position Figure 1 Danger zones for various types of intermediate provers
4.3 Electrical hazards Hazard of electric shock from direct or indirect contact with live components. Hazard of external influences on electrical equipment (e.g. cleaning with water). 4.4 Hazards resulting from inhalation of dust Use of flour dusters may expose operators to dust including flour and ingredients which may be harmful to their health, causing rhinitis (running noses), watering eyes and possibly occupational asthma. 4.5 Hazard generated by neglecting hygienic design principles The neglection of hygienic principles can create unacceptable modification of foodstuff and therefore a risk to human health, i.e. through physical, chemical or microbial pollution. 4.6 Hazards generated by neglecting ergonomic principles During operation, cleaning and maintenance, there is a risk of injury or chronic damage to the body resulting from awkward body postures. SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 11 ! 5 Safety and hygiene requirements and/or protective measures"""" ! 5.1 General Machinery shall comply with the safety requirements and/or protective measures of this clause.
In addition, the machine shall be designed according to the principles of EN ISO 12100-2 for relevant but not significant hazards, which are not dealt with by this document. The safety related parts of the control systems shall meet at least category 1 of 6.2.2 of EN 954-1:1996 or present at least a performance level c defined in accordance with EN ISO 13849-1:2008. When fixed guards, or parts of the machine acting as such, are not permanently fixed e.g. by welding, their fixing systems shall remain attached to the guards or to the machinery when the guards are removed." 5.2 Mechanical hazards Where reference is made to interlocking devices, they shall comply with 4.2.1 and clauses 5 and 6 of !EN 1088:1995+A2:2008". Where the interlocking mechanism has movable parts, e.g. position switches, these shall be protected from contamination with dough or dry ingredients, e. g. by mounting them within the machine body. Alternatively, magnetic switches may be used if total removal of any guard is required. Where switches may be exposed to water, e.g. during cleaning, they shall be protected to an appropriate IP rating (EN 60529: 1991, e. g. IPX5). !deleted text" 5.2.1 Zone 1: Zone of loading and unloading of the dough portions 5.2.1.1 The risk of trapping the arm between the moving pocket carrier and the fixed edges of the loading or unloading openings shall be prevented by any of the following: ensuring the distance between the fixed edge of the opening and the nearest rigid part of the pocket carrier is a minimum of 120 mm (see Figures 2 a) and 2b); providing a pressure sensitive trip bar or wire (see !EN 1760-2") covering the opening where the trapping may occur (see Figure 2 c) with a stopping time less than or equal to 1 s; ensuring the force required to stop the motion of the pocket carrier does not exceed 150 N either loaded or unloaded; this could be achieved e.g. by a torque limiting device; where pocket carrier movement is not continuous, the pressure sensitive bar or wire is not required. The indexing movement may be controlled by a timer or the operation of a manual control device. This method can only be used where both the loading and the unloading area are visible from the position of the control device. 5.2.1.2 The risk of trapping between adjacent descending and ascending pocket carriers shall be prevented by any of the following: ensuring the distance between the axis of the ascending pocket and the axis of the descending pocket carrier is a minimum of 200 mm (see Figure 2 d)); SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 12 provision of a fixed plate behind the first line of carriers preventing through access; ensuring the force required to stop the motion of the pocket carrier does not exceed 150 N either loaded or unloaded. 5.2.1.3 Automatic loading systems When loading is automatic (see examples in Figure 3): either the system is enclosed in the machine frame with at least one interlocking guard, in order to permit access for cleaning; or the system is outside the frame and access to any danger points shall be prevented by any of the following: provision of a trip device with a stopping time less or equal to 1 s and with the dimensions shown in Figure 2 c); provision of a fixed or an interlocking guard with any openings in accordance with EN 294: 1992, Table 4; ensuring the force required to stop the motion of the dangerous elements does not exceed 150 N. 5.2.2 Zone 2: Drive mechanisms Access to the primary drive system, for example motor and vee belt drives, shall be prevented. This may be achieved by use of fixed guards complying with !EN 953:1997+A1:2009". The machine frame itself may act as a fixed guard. Access to inrunning nips between drive chains and sprockets for the pocket carriers shall be prevented. The machine frame normally acts as a guard. If any nips cannot be made inaccessible by means of openings in accordance with the distances in EN 294:1992, they shall be individually safeguarded as shown for example in Figure 2 e). 5.2.3 Zone 3: Carrier transfer system If access to the machine interior is required for maintenance or cleaning, doors or movable panels shall be designed as fixed or interlocking guards. 5.2.4 Zone 4: Flour duster If the force necessary to stop the moving parts of the flour duster is more than 150 N, the flour duster shall be protected by a fixed or interlocking guard. The flour container opening can be left unprotected if there is no risk from the flour feed system (e.g. if the feed consists of a spindle with rubber spokes or notches, or if the flour is sprinkled by a vibrating device). 5.2.5 Zone 5: Fan with or without heating device Access to the fan and/or heater shall be prevented by any of the following: either the sum of the distances from the floor to the danger point is greater than or equal to 2,50 m; or access to the danger point is prevented by fixed guards, e.g. wire mesh with dimensions in accordance with EN 294: 1992, Table 4. SIST EN 12043:2002+A1:2011
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Key
1 Movement of tilting pocket 2 Movement of soft pocket 3 Movement of rigid pocket Figure 2 a) Gap between fixed edge and moving pocket carrier
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Key
1 Fixed pocket or temporarily fixed during loading
Figure 2 b) Gap between fixed edge and pocket carrier SIST EN 12043:2002+A1:2011
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Key 1 Trip device 2 Fixed pocket or temporarily fixed during loading 3 Tilting pocket Figure 2 c) Safeguarding by trip device SIST EN 12043:2002+A1:2011
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Key 1 Tilting pockets Figure 2 d) Gap between ascending and descending pocket carrier
Figure 2 e) Safeguarding of inrunning nip between gear and chain Figure 2 Protective measures against mechanical hazards
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Figure 3 a) Pocket feeding device The pockets of the intermediate prover are individually fed by dough pieces coming e.g. directly from a conical rounder.
Figure 3 b) Simple tipping device A conveyor belt tips when it is totally filled, in order to drop the dough pieces in the next carrier of the intermediate prover.
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Figure 3 c) Opening moulding belts When the moulding belts are totally filled, they rotate apart in order to drop the dough pieces in the next carrier of the intermediate prover.
Figure 3 d) Pushing device A full conveyor belt is discharged by a pushing device, into the next carrier of the intermediate prover. Figure 3 Examples of automatic loading systems
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EN 12043:2000+A1:2010 (E) 19 5.2.6 Loss of stability Machines shall be designed to be stable. For machines to be fixed to the floor, wall, or roof, the instruction handbook shall indicate the values of forces at the fixing points. Free standing machines shall be stable when tilted 10° from the horizontal plane in the most unfavourable direction. Free standing machines with castors shall have a locking device for example a brake on two castors (or sets of castors). ! 5.3 Electrical hazards 5.3.1 General Electrical equipment, for example switches, that may be exposed to water, e.g. during cleaning, shall be protected to an appropriate IP rating according to EN 60529 and EN 60204-1. The electrical equipment shall comply with EN 60204-1:2006, with the following precision. 5.3.2 Safety requirements related to electromagnetic phenomena
The machines shall have sufficient immunity to electromagnetic disturbances to enable them to operate safely as intended and not fail to danger when exposed to the levels and types of disturbances intended by the manufacturer. The manufacturer of the machines shall design, install and wire the equipment and sub-assemblies taking into account the recommendations of the suppliers of these sub-assemblies. 5.3.3 Protection against electric shock The electrical equipment shall comply with Clause 6 of EN 60204-1:2006. 5.3.4 Power circuits Devices for detection and interruption of over-current have to be applied to each live conductor in compliance with EN 60204-1:2006, 7.2.3. In case of single phase machines, no such device is required for the earthed neutral conductor. 5.3.5 Protection against earth faults in control circuits For machinery supplied from a single-phase conductor and an earthed neutral conductor, there is no requirement for double pole interruption of the control circuit. The single pole interruption shall be in the phase conductor (see 9.4.3.1 of EN 60204-1:2006). 5.3.6 Emergency stop No emergency stop is required for intermediate provers. In this case particular attention shall be given to the accessibility of the normal OFF switch from the operator position. SIST EN 12043:2002+A1:2011
EN 12043:2000+A1:2010 (E) 20 5.3.7 Motor enclosures Where a motor has a degree of protection lower than IP23 (see EN 60529:1991) it shall be mounted inside an enclosure (see 14.2 of EN 60204-1:2006) that guarantees a minimum degree of protection of IP23 (see
EN 60529:1991)." 5.4 Protection against dust emission Means shall be provided to prevent flour from spilling onto the floor, for example a collecting device for flour below the end of conveyors. If a flour duster is used to sprinkle special types of dough, one or more of the following require
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