SIST EN 12042:2006
(Main)Food processing machinery - Automatic dividers - Safety and hygiene requirements
Food processing machinery - Automatic dividers - Safety and hygiene requirements
1.1 This European Standard applies to the design and manufacture of automatic dividers whose function is based on the volumetric principle using one or more suction and/or pressing pistons. Dough dividers working in other ways are excluded from the scope of this European Standard.
These automatic dividers are used in the food industry and shops (pastry-making, bakeries, confectionery, etc.) for dividing dough or pastry into portions to produce the required weight of dough piece. These machines can be fed by hand or automatically.
This European Standard deals with all significant hazards, hazardous situations and events relevant to the installation, adjustment, operation, cleaning and maintenance of automatic dividers, when they are used as intended and under the conditions foreseen by the manufacturer (see clause 4).
When drafting this European Standard, it has been assumed that the machines are not intended to be cleaned with water.
1.2 The following machines are excluded:
experimental and testing machines, under development by the manufacturer;
weighting devices;
"knife and belt" dividers and other types of machines where the dividing mechanism is based on the functioning of a moving knife;
lifting and tilting machines ) or other separate feeding machines.
1.3 A noise test code is included in Annex A to assist manufacturers to measure noise levels for the purpose of the noise emission declaration.
1.4 This European Standard is not applicable to machines which are manufactured before the date of publication of this European Standard by CEN.
Nahrungsmittelmaschinen - Teigteilmaschinen - Sicherheits- und Hygieneanforderungen
1.1 Diese Europäische Norm gilt für die Gestaltung/Konstruktion und Herstellung von automatischen Teigteilmaschinen, deren Funktion auf dem volumetrischen Prinzip basiert, bei dem ein oder mehrere Saug- bzw. Druckkolben zum Einsatz kommen, Teigteiler, die auf andere Art arbeiten, sind vom Anwendungsbereich dieser Europäischen Norm ausgeschlossen.
Diese automatischen Teigteilmaschinen werden in der Nahrungsmittelindustrie und in Geschäften (Konditoreien, Bäckereien, Kohnfisserien usw.) für das Teilen von Teig oder Blätterteig in Portionen um das gewünschte Gewicht der Teigportion herzustellen. Diese Maschinen werden automatisch oder von Hand bestückt.
Diese Europäische Norm umfasst sämtliche signifikanten Gefährdungen, Gefährdungssituationen und Ereignisse in Bezug auf Installation, das Einrichten, die Bedienung, Reinigung und Wartung automatischer Teigteilmaschinen, die relevant für den bestimmungsgemäßen Gebrauch unter den vom Hersteller vorhersehbaren Bedingungen, sind (siehe Abschnitt 4).
Bei Verfassung dieser Europäschen Norm wurde davon ausgegangen, dass diese Maschinen nicht für eine Reinigung mit Wasser vorgesehen sind.
1.2 Die folgenden Maschinen sind ausgenommen:
Versuchs- und Prüfmaschinen die in der Entwicklung beim Hersteller sind;
Wägeeinrichtungen;
Messer- und Band-Teiler und andere Bauarten von Maschinen, bei denen der Teilmechanismus auf der Funktion eines sich bewegenden Messers basiert;
Hub und Kippeinrichtungen ) oder andere separate Zuführmechanismen.
1.3 Im Anhang A befinden sich ein Verfahren zur Geräuschmessung als Hilfestellung für den Hersteller zur Geräuschmessung zur Angabe der Geräuschemission.
1.4 Diese Europäische Norm gilt nicht für Maschinen, die vor dem Veröffentlichungsdatum dieser Europäischen Norm durch CEN, gebaut wurden.
Machines pour les produits alimentaires - Diviseuses automatiques - Prescriptions relatives a la sécurité et a l'hygiene
1.1 La présente Norme européenne s'applique a la conception et a la fabrication de diviseuses automatiques dont le fonctionnement est basé sur le principe volumétrique utilisant un ou plusieurs pistons d'aspiration et/ou de compression. Les diviseuses de pâte fonctionnant sur d'autres principes sont exclues du domaine d'application de la présente Norme européenne.
Ces diviseuses automatiques sont utilisées dans l'industrie alimentaire et les commerces de l'alimentation (pâtisseries, boulangeries, confiseries, etc.) pour diviser la pâte ou la pâtisserie afin de produire des pâtons d’un poids déterminé. Ces machines peuvent etre alimentées a la main ou automatiquement.
La présente Norme européenne traite de tous les phénomenes dangereux, situations et événements dangereux significatifs relatifs a l'installation, au réglage, au fonctionnement, au nettoyage et a la maintenance des diviseuses automatiques lorsqu'elles sont utilisées dans le cadre et dans les conditions normalement prévus par le fabricant (voir Article 4).
A la rédaction de la présente Norme européenne, il a été présumé que le nettoyage des machines a l'eau n'est pas prévu.
1.2 Les machines suivantes sont exclues du domaine d'application :
- les machines expérimentales et d'essais en cours de mise au point par le fabricant ;
- les dispositifs de pesée ;
- les diviseuses « a couteau et a bande » et autres types de machine ou le mécanisme diviseur est basé sur le fonctionnement d'un couteau mobile ;
- les élévateurs/basculeurs ) ou autres machines a alimentation séparée.
1.3 Un code d’essai acoustique est inclus dans l’Annexe A pour aider les fabricants a mesurer les niveaux de bruit en vue d’une déclaration d'émission sonore.
1.4 La présente Norme européenne ne s'applique pas aux machines qui sont fabriquées avant la date de publication de la présente Norme européenne par le CEN.
Stroji za predelavo hrane – Avtomatski delilniki testa – Varnostne in higienske zahteve
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12042:2006
01-marec-2006
Stroji za predelavo hrane – Avtomatski delilniki testa – Varnostne in higienske
zahteve
Food processing machinery - Automatic dividers - Safety and hygiene requirements
Nahrungsmittelmaschinen - Teigteilmaschinen - Sicherheits- und Hygieneanforderungen
Machines pour les produits alimentaires - Diviseuses automatiques - Prescriptions
relatives a la sécurité et a l'hygiene
Ta slovenski standard je istoveten z: EN 12042:2005
ICS:
67.260 Tovarne in oprema za Plants and equipment for the
živilsko industrijo food industry
SIST EN 12042:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 12042
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2005
ICS 67.260
English Version
Food processing machinery - Automatic dividers - Safety and
hygiene requirements
Machines pour les produits alimentaires - Diviseuses Nahrungsmittelmaschinen - Teigteilmaschinen -
automatiques - Prescriptions relatives à la sécurité et à Sicherheits- und Hygieneanforderungen
l'hygiène
This European Standard was approved by CEN on 1 August 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12042:2005: E
worldwide for CEN national Members.
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EN 12042:2005 (E)
Contents Page
Foreword .4
Introduction.5
1 Scope .6
2 Normative references .6
3 Terms, definitions and description.7
3.1 Terms and definitions.7
3.2 Description .8
4 List of significant hazards.10
4.1 General .10
4.2 Mechanical hazards .10
4.3 Electrical hazards.11
4.4 Hazards generated by noise.11
4.5 Hazards resulting from dust inhalation.11
4.6 Hygiene.11
4.7 Hazards generated by neglecting ergonomic principles .11
4.8 Hazards specific to divider oil.12
4.9 Pneumatic and hydraulic equipment.12
5 Safety and hygiene requirements and/or measures.12
5.1 General .12
5.2 Mechanical hazards .12
5.3 Electrical hazards.19
5.4 Noise reduction.20
5.5 Protection against dust emission.20
5.6 Protection against spilling oil .20
5.7 Hygiene requirements .20
5.8 Hazards generated by neglecting ergonomic principles .21
5.9 Pneumatic and hydraulic equipment.22
6 Verification of safety and hygiene requirements and/or measures .23
7 Information for use .24
7.1 Signals and warning .24
7.2 Instruction handbook .24
7.3 Marking .25
Annex A (normative) Noise test code for automatic dividers – Grade 2 of accuracy.26
Annex B (normative) Principles of design to ensure the cleanability of automatic dividers.29
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC, amended by 98/79/EC.48
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EN 12042:2005 (E)
Bibliography.49
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EN 12042:2005 (E)
Foreword
This European Standard (EN 12042:2005) has been prepared by Technical Committee CEN/TC 153 “Food
processing machinery — Safety and hygiene specifications”, 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 April 2006, and conflicting national standards shall be withdrawn at the
latest by April 2006.
This European Standard has been prepared under a Mandate given to CEN by the Commission of 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 European
Standard.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
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EN 12042:2005 (E)
Introduction
This European Standard is a type C standard as stated in EN ISO 12100-1.
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 that 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.
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EN 12042:2005 (E)
1 Scope
1.1 This European Standard applies to the design and manufacture of automatic dividers whose function is
based on the volumetric principle using one or more suction and/or pressing pistons. Dough dividers working
in other ways are excluded from the scope of this European Standard.
These automatic dividers are used in the food industry and shops (pastry-making, bakeries, confectionery,
etc.) for dividing dough or pastry into portions to produce the required weight of dough piece. These machines
can be fed by hand or automatically.
This European Standard deals with all significant hazards, hazardous situations and events relevant to the
installation, adjustment, operation, cleaning and maintenance of automatic dividers, when they are used as
intended and under the conditions foreseen by the manufacturer (see clause 4).
When drafting this European Standard, it has been assumed that the machines are not intended to be cleaned
with water.
1.2 The following machines are excluded:
experimental and testing machines, under development by the manufacturer;
weighting devices;
“knife and belt" dividers and other types of machines where the dividing mechanism is based on the
functioning of a moving knife;
1)
lifting and tilting machines or other separate feeding machines.
1.3 A noise test code is included in Annex A to assist manufacturers to measure noise levels for the
purpose of the noise emission declaration.
1.4 This European Standard is not applicable to machines which are manufactured before the date of
publication of this European Standard by CEN.
2 Normative references
The following referenced documents are indispensable for the application of this European Standard. 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 614-1:1995, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general
principles.
EN 619, Continuous handling equipment and systems — Safety and EMC requirements for equipment for
mechanical handling of unit loads.
EN 953:1997, 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.
1) see EN 13288
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EN 12042:2005 (E)
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 1037, Safety of machinery — Prevention of unexpected start-up.
EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design
and selection.
EN 1672-2:2005, Food processing machinery — Basic concepts — Part 2: Hygiene requirements.
EN 1760-2, Safety of machinery — Pressure sensitive protective devices — Part 2: General principles for the
design and testing of pressure sensitive edges and pressure sensitive bars.
EN 60204-1:1997, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
(IEC 60204-1:1997).
EN 60529, Degrees of protection provided by enclosures (IP code)(IEC 60529:1989).
EN 61310-1, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual,
auditory and tactile signals (IEC 61310-1/1995).
EN ISO 3743-1, 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 3744:1995, 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 4287, Geometrical product Specifications (GPS) – Surface texture: Profile method — Terms,
definitions and surface texture parameters (ISO 4287:1997).
EN ISO 4871, Acoustics — Declaration and verification of noise emission values of machinery and equipment
(ISO 4871:1996).
EN ISO 11201, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound
pressure levels at the work station and at other specified positions — Engineering method in an essentially
free field over a reflecting plane (ISO 11201:1995).
EN ISO 11688-1, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning (ISO/TR 11688-1:1995).
EN ISO 12001, 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).
3 Terms, definitions and description
3.1 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN ISO 12100-1:2003 apply.
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EN 12042:2005 (E)
3.2 Description
The dividers in the scope consist of the elements listed below (covered optional equipment is also included)
(see Figure 1):
1) loading hopper;
2) feeding assistance device (optional, see Figure 2);
3) volumetric dividing device which can be of one of the following types:
drum and piston;
sliding drawer;
and the operating mechanisms;
4) flour duster at the delivery of pieces of dough (optional);
5) one or more conveyor belts designed to discharge pieces of dough;
6) one or more drive units to operate the dividing device and the discharge devices;
7) sundry devices, e. g. to set the weight of the portions;
8) control system.
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EN 12042:2005 (E)
Figure 1 — Main parts of an automatic divider
Figure 2 — Examples of feeding assistance devices
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EN 12042:2005 (E)
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 European Standard, identified by risk assessment as significant for this type of machinery and which
require action to eliminate or reduce the risk.
Before using this European Standard it is important to carry out a risk assessment of the automatic dividers to
check that they have the hazards identified in this clause.
4.2 Mechanical hazards
The significant mechanical hazards are:
crushing;
shearing;
cutting;
drawing-in;
abrasion;
loss of stability.
Figure 3 illustrates five danger zones associated with mechanical hazards:
Zone 1: dividing zone or feeding device zone if any, access via hopper:
hazards of shearing, crushing, cutting;
Zone 2: Access to dividing mechanisms and other moving parts via discharge opening/discharge belt:
hazards of entanglement and crushing;
NOTE In principle, there is no significant hazard at the discharge side of a drum and piston type dividing
mechanism.
Zone 3: discharge belt, space between belt and roller:
hazard of crushing;
Zone 4: drive mechanisms and other moving internal components:
hazards of crushing, impact, shearing, drawing-in;
Zone 5: Flour duster:
hazard of entanglement.
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EN 12042:2005 (E)
Key
1 zone 1
2 zone 2
3 zone 3
4 zone 4
5 zone 5
Figure 3 — Danger zones of an automatic divider
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 generated by noise
Automatic dividers may generate airborne noise which can result in hearing damage, in accidents due to
interference with speech communication and in interference with the perception of acoustic signals.
4.5 Hazards resulting from dust inhalation
Use of flour dusters exposes operators to dust including flour and ingredients which may be harmful to their
health, causing rhinitis (running noses), watering eyes and possibly occupational asthma.
4.6 Hygiene
Lack of hygiene can create a risk to human health and unacceptable modification of foodstuff e.g.
contamination by microbial growth or foreign materials.
4.7 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.
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EN 12042:2005 (E)
4.8 Hazards specific to divider oil
A slipping hazard results if divider oil is allowed to spill onto the floor around the divider.
4.9 Pneumatic and hydraulic equipment
Pneumatic and hydraulic equipment presents crushing, shearing, ejection of parts, explosion and injection of
fluids hazards. Stored energy in pneumatic or hydraulic systems may cause mechanisms to move
unexpectedly even when power supplies are disconnected. In addition hydraulic oil and pneumatic lubricating
oil present a potential fire hazard and can contaminate agri-foodstuffs.
5 Safety and hygiene requirements and/or measures
5.1 General
Machinery shall comply with the safety and hygiene requirements and/or protective measures of this clause.
In addition, the machine shall be designed according to the principles of EN ISO 12100 for hazards relevant
but not significant, which are not dealt with by this European Standard (e. g. sharp edges).
NOTE For hazards which are to be reduced by the application of type B standards such as EN 294, EN 614-1,
EN 953, EN 954-1, EN 982, EN 983, EN 1037, EN 1088, EN 1760-2, EN 60529, EN 60204-1 and EN 61310-1, the
manufacturer should carry out a risk assessment to establish the requirements of that standard which are to be applied.
This specific risk assessment is part of the general risk assessment of the machine.
Where the means of reducing the risk is by the physical arrangement or positioning of the installed machine,
the manufacturer shall include in the information for use a reference to the reduction means to be provided,
and to any limiting value of the requirement, and, if appropriate, to the means of verification.
Where the means of reducing the risk is by a safe system of working the machinery, the manufacturer shall
include in the Information for use details of the system and of the elements of training required by the
operating personnel.
5.2 Mechanical hazards
5.2.1 General
Guards shall comply with EN 953. Where reference is made to interlocking devices throughout clause 5, they
shall comply with 4.2.1 of EN 953:1997 (guard interlocking without locking) and clauses 5 and 6 of
EN 1088:1995. Interlocking devices on hinged hoppers and similar equipment shall be activated before the
opening between the movable and the fixed parts exceeds 25 mm.
Where the interlocking mechanism has movable parts, e.g. position switches, these shall be protected from
contamination by 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.
Safety related control systems shall be at least category 1 as defined in clause 6 of EN 954-1:1996.
The outside walls of the machine shall be designed (e. g. vertical and smooth) to prevent the operator
climbing on the machine.
Folding interlocked steps, if fitted, shall either be designed so that they are always active or designed so that it
is not be possible to climb on them in the folded position.
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EN 12042:2005 (E)
5.2.2 Zone 1: Access to the dividing zone or feeding device zone if any, via the hopper
5.2.2.1 General
When a hoist or lifting and tilting machine is used to feed the hopper of the dough divider, the hazardous area,
at the interface between the tilting machine and the automatic dividers, shall be safeguarded. This can be
achieved by enclosure of the hoist or lifting and tilting machine and divider hopper by a combination of fixed
and interlocked guards whose dimensions comply with Table 2 or Table 4 of EN 294:1992, by pressure
sensitive bars around the top of the hopper, or by a combination of both.
In addition, warning signs (see Figure 4) shall be attached to the hopper, warning of the shearing hazards that
exist within the hopper.
For machines where the upper rim of the hopper is equal to or higher than 1,6 m, the following additional
requirements also apply on machines where no interlocking steps or working platforms are provided
(see 5.2.2.4):
means for observing of the dough from floor level shall be provided, for example one or more mirrors or
transparent panels in the side of the hoppers;
facility to allow cleaning from floor level, for example an interlocked hinged hopper or removable hopper
panels that comply with EN 953.
Figure 4 — Safety signs
5.2.2.2 Automatically fed machines
Access via the hopper opening to the hazardous zone shall be prevented while the machine is in operation.
The hazardous area shall be enclosed by fixed and/or interlocked guards whose dimensions comply with
Table 4 of EN 294:1992.
The principle of distance guarding shall only be used if the height of the protective structure in the sense of
EN 294 is at least 3 m.
Where an intermediate hopper is fitted this can form part of the guarding system.
5.2.2.3 Hand-fed machines
The access to the danger zones in the feed intake hopper shall be restricted or prevented by one of the
following methods:
a) by the provision of an interlocked lid or guard (see 3.25.4 of EN ISO 12100-1:2003) which is dimensioned
and positioned in accordance with Table 4 of EN 294:1992. Where the distance to the danger point is at
least 850 mm, an aperture measuring no more than 180 mm x 180 mm is allowed in the lid provided,
warning signs are fitted next to the aperture. The dimensions of the warning signs shall be in accordance
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EN 12042:2005 (E)
with EN 61310-1. The stopping time after functioning of the interlocking device shall be less than or equal
to 4 s or the guard shall be interlocked with guard locking.
b) by the provision of an interlocked extension feed chute or swan neck (see Figure 5) which is dimensioned
and positioned in accordance with EN 294:1992, Table 2.
This solution shall also take account of ergonomics aspects.
The stopping time after functioning of the interlocking device shall be less than or equal to 4 s or the
guard shall be interlocked with guard locking;
Key
1 danger zone
a height of danger zone
b height of protective structure
c horizontal distance to danger zone
Figure 5 — Example with an interlocking extension feed chute
For cleaning reasons, the swan neck extension shall be hinged and interlocked.
c) by fitting pressure sensitive trip-devices that comply with EN 1760-2 around the entire hopper edge and
the safety distances shown in Figure 6;
The design of the trip devices shall minimise the risk of dough preventing their operation.
The stopping time after the actuating of the trip device shall be less than or equal to 1 s.
NOTE At present new solutions for the safeguarding of a hopper are under study. One of these is a light barrier with
delayed switching action placed on top of the hopper. On the basis of the difference in time the dough and the operator's
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EN 12042:2005 (E)
arm are interrupting the light rays, the device is capable of distinguishing between both. This means that dough can be
added without interrupting the machine functioning.
5.2.2.4 Additional measures – Interlocked step or platforms
If danger points in the feed intake hopper can be reached from steps or platforms with S as defined in Figure 6
less than 2 250 mm, the steps or treads of platforms shall be interlocked. The interlock shall stop the machine
and make it impossible to start if the steps or platforms are in the usable position or if a person is stepping on
the platform. When the automatic dividers are running empty, the mechanism shall come to a standstill within
4 s after the interlocking system has been actuated.
The interlocking system of the movable step shall comply with 5.2.1 and the safety-related components of the
control system shall comply with 6.2.2, category 1 of EN 954-1:1996.
The standing area of steps shall have a width ≥ 500 mm and a length ≥ 400 mm and a toe rail of a height of
15 mm. If the standing area is < 500 mm above ground, an area of a width ≥ 400 mm and a length ≥ 350 mm
is sufficient. The standing area shall be of the non-slip type.
Platforms which are located > 500 mm above ground shall be fitted with safety devices to prevent falls.
Intermediate steps, stairs or ladders and grab handles shall be provided if the step-up height to the step or to
the platform is > 500 mm. The standing areas and treads shall be sufficiently large and of the non-slip type
and arranged at identical distances from one another.
The standing area of the intermediate step shall have a width of ≥ 300 mm and a length of ≥ 200 mm. Treads
of ladders shall have a length of ≥ 500 mm and a width of ≥ 80 mm. A ladder shall be arranged at an angle of
< 70° to the horizontal.
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EN 12042:2005 (E)
Key
1 sensitive trip-device H ≥ 1 100 mm
1
2 Interlocked step
H ≥ 1 600 mm
2
3 danger zone
D ≥ 550 mm
A ≤ 50 mm
S = H + E + D ≥ 2 250
2
where
A = distance between the internal rim of the trip device and the top edge of the hopper
D = minimum distance from the top edge of the hopper, interlocking extension or guard
to the danger point
H = minimum distance to the upper edge from the floor
2
h = height of the step
Figure 6 — Required safety distances with the use of a pressure sensitive trip-device around the
hopper edge and an interlocked step
If h ≥ 500 mm, one or more intermediate steps shall be used.
5.2.3 Zone 2: Access to the dividing mechanism and other moving parts via the discharge opening
NOTE In principle, there is no significant hazard at the discharge side of a drum and piston type dividing mechanism.
Access to the hazardous dividing mechanisms and other moving parts via the discharge opening shall be
prevented by:
either a fixed guard with dimensions according to the EN 294:1992 Table 4; or
movable interlocking distance guard in accordance with Table 4 of EN 294:1992; or
movable interlocking distance guard in accordance with Table 1 and Figure 7.
If the guard has openings, the distance between bars or mesh shall comply with EN 294:1992 Table 4.
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EN 12042:2005 (E)
Table 1 — Dimensions of the guard or tunnel
Dimensions in millimetres
L 35 40 45 50 55 60 65 70 80 105 150
D 200 225 250 300 350 400 450 500 550 550 850
where
L = distance from the conveyor belt to the edge of the tunnel;
D = distance from the edge of the tunnel to danger point of the mechanism.
...
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