EN 14958:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Food processing machinery - Machinery for grinding and processing flour and semolina - Safety and hygiene requirementsStroji za obdelavo hrane – Stroji za mletje in obdelavo moke in zdroba – Varnostne in higienske zahteveMachines pour les produits alimentaires - Machines pour la mouture et la transformation de farines et de semoules - Prescriptions relatives a la sécurité et a l'hygiéneGetreideverarbeitungsmaschinen - Mahlen und Verarbeiten von Mehl und Grieß - Sicherheits- und HygieneanforderungenTa slovenski standard je istoveten z:EN 14958:2006SIST EN 14958:2006en67.260Tovarne in oprema za živilsko industrijoPlants and equipment for the food industryICS:SLOVENSKI
STANDARDSIST EN 14958:200601-oktober-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14958June 2006ICS 67.260 English VersionFood processing machinery - Machinery for grinding andprocessing flour and semolina - Safety and hygienerequirementsMachines pour les produits alimentaires - Machines pour lamouture et la transformation de farines et de semoules -Prescriptions relatives à la sécurité et à l'hygiéneGetreideverarbeitungsmaschinen - Mahlen und Verarbeitenvon Mehl und Grieß - Sicherheits- undHygieneanforderungenThis European Standard was approved by CEN on 10 May 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.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, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14958:2006: E

Principles of design to ensure the cleanability of machinery.37 Annex B (normative)
Noise test code for grinding and processing flour and semolina (grade 2).47 Annex C (informative)
Evaluation of explosion risks in plants including grain processing machines.50 Annex ZA (normative)
Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC.54 Bibliography.55

This European Standard is not applicable to:  machines intended for household use or laboratory use;  stone mills;  equipment for dampening and heating;  auxiliary equipment for conveying, weighting and bagging (without changing the characteristics of the products). This European Standard is not dealing with the following:  hazards related to decommissioning;  the hazards of the installations into which the machines are incorporated other than those directly related to the machines in the scope (e.g. start of the installation, disconnection of energy supply, need from an emergency stop device);  hazards due to the use of the machinery in a potentially explosive atmosphere (when producing this standard it has been assumed that the machinery in the scope, if designed and used in accordance with this European Standard, is not creating itself a hazardous atmosphere wholly of partly surrounding it). NOTE If the machine is intended for use in a potentially explosive atmosphere, additional safety measures can be necessary1). This European Standard is not applicable to machines for grinding and processing of flour and semolina 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 distances to prevent danger zones being reached by the upper limbs EN 349:1993, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
1) For the EU and the EEA the requirements of the EU directive 94/9/EC may apply.

(see Figure 4). The following machines are included in this group: vibrating finishers, intensive scourers, rotating sifters, bran finishers, crumblers, de-germinators, de-huskers 3.5 impact machine machine that carry out a physical action on grain and/or grain products by causing a granulometric reduction by impact using rotating components (see Figure 5). The following machines are included in this group: impactors, infestation destroyers

Key 1 product inlet 2 grinding rolls 3 product outlet 4 drive motor 5 feeding rolls Figure 1 — Operating principle of roller mill

Key 1 product inlet 2 sieves 3 product outlet 4 centrifugal weights 5 suspension rods 6 drive motor Figure 2 — Operating principle of plan sifter and rotary separator

Key 1 product inlet 2 air exhaust 3 sieves 4 product outlets 5 supporting springs 6 vibrating devices Figure 3 — Operating principle of air classifier (purifier, gravity separator, aspirator, de-stoner, vibrating separator)

Key 1 product inlet 2 air exhaust 3 fixed component (sieve or screen) 4 rotating component 5 product outlet 6 drive motor Figure 4 — Operating principle of rotating machine (vibrating fisher, intensive scourer, rotating sifter, bran finisher, crumbler, de-germinator, de-husker)

Key 1 product inlet 2 rotating components 3 drive motor 4 product outlet Figure 5 — Operating principle of impact machine (impactor, infestation destroyer) 4 List of significant hazards 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 standard it is important to carry out a risk assessment of the different types of machines to check that it has the hazards identified in this clause.

phenomena – 5.3 4.3 Noise hazards e.g. hearing damage, tinnitus, accidents due to a reduced intelligibility of acoustic warning signals, limited speech intelligibility – 5.4 4.4 Hazards resulting from inhalation of dust – 5.5 4.5 Hazards due to neglecting ergonomic principles – 5.6 4.6 Hazards due to neglecting hygienic principles – 5.7.2.1 – 5.7.2.2 – 5.7.2.3 – 5.7.2.4 – 5.7.2.5 – 5.7.2.6 – 5.7.2.7 4.7 Fire and explosion hazards – 5.8 4.8 harmful substances
5.9
In general movable guards are not considered for the machines in the scope because of the nature of the process.  if the manufacturer adopts as an alternative a movable interlocking guard, this guard shall comply with EN 953 and 1088. In that case the possible need for interlocking with guard locking shall be defined on the basis of the risk assessment;  safety distances shall be in conformity with EN 294, EN 349 and EN 811. If the access to danger zones at product inlet and/or outlet openings has to be prevented by connection to the machine of auxiliary equipment or other machinery, the information for use shall include the necessary instructions for correct connection. 5.2.2 Roller mill (see Figure 6) 5.2.2.1 Zone 1: feeding rolls Access shall be prevented by fixed guard(s). 5.2.2.2 Zone 2: grinding rolls Access during the normal operation shall be made impossible by means of fixed guard(s). If access to this zone is necessary during normal operation, for example for verifying the product, such access shall only be possible at the out-feed side of the rolls, and an internal fixed guard shall be installed which prevent access to the danger points in accordance with EN 294 (Tables 3 or 4). In that case the external door giving access can be movable without interlocking. 5.2.2.3 Zone 3: roll drive arrangement The access to the roll drive arrangement (or the part of it) located on the same floor as the equipment shall be prevented by fixed enclosing guards. The access to the part of the roll drive arrangement situated below that floor shall also be prevented by fixed enclosing guards unless for danger zones located at more than 2,7 m from the lower floor (see EN 294:1992, 4.1.1).

Key Zone1: feeding rolls Zone 2: grinding rolls Zone 3: roll drive arrangement Zone 4: pneumatics pistons Zone 5: grinding rolls transmission drive Zone 6: feeding rolls transmission drive Zone 7: scraper Figure 6 — Hazard zones in the roller mill

Key Zone 1: centrifugal weights transmission Zone 2: centrifugal weights Zone 8: loss of stability Figure 7 — Hazard zones in the plan sifter
Key Zone 1: vibrating drive Zone 8: loss of stability Figure 8 — Hazard zones at air classifier (purifier)

Key Zone 1: rotor Zone 2: motor drive belt transmission Zone 3: screw Zone 4: vibrating drive Figure 9 — Hazard zones in the air classifier (aspirator)

Key Zone 1: rotor Zone 2: motor drive belt transmission Figure 10 — Hazard zones in the rotating machine

Key Zone 1: rotor Figure 11 — Hazard zones in the impact machine (impactor)

Key Zone 1: rotor Zone 2: motor drive transmission Figure 12 — Hazard zones in the impact machine (infestation destroyer) 5.3 Protective measures against electrical hazards 5.3.1 General All electrical equipment associated with the machine shall comply with the requirements of EN 60204-1 as indicated in this clause. 5.3.2 Protection against electric shock 5.3.2.1 Direct contact Live parts shall be located inside enclosures that provide protection against direct contact of at least IP2X as defined in EN 60529:1991. The opening of enclosure shall only be possible by using a key or tool, or by disconnecting the live parts before opening the enclosure (see 6.2.2 options a and b of EN 60204-1:1997). 5.3.2.2 Indirect contact Protection against indirect contact due to insulation failure between live parts and exposed conductive parts, shall be achieved by the connection of exposed conductive parts to the protective bonding circuits and disconnection of the supply in accordance with EN 60204-1:1997, 6.3.3. 5.3.3 Degrees of protection (see 12.3 of EN 60204-1:1997) Enclosure of control gear shall provide a degree of protection at least IP54.

Key
non food area
food area 1 inlet spout 2 feed rolls conveying chute 3 feed valve 4 feed rolls 5 grinding rolls conveying chute 6 grinding rolls 7 brushes/scrapers 8 outlet hopper 9 surfaces close to the feed zone 10, 11 surfaces close to the grinding rolls 12 surfaces close to brushes / scrapers Figure 13

Key
non food area
food area 1 inlet spout 2 sieves compartment upper cover 3 sieves compartment inner surfaces 4 sieve 5 sieve compartment lower cover 6 outlet spout Figure 14

Key
non food area
food area 1 inlet spout 2 feed zone 3 sieves 4 outlet hoppers Figure 15

Key
non food area
food area 1 inlet spout
2 moving body 3 outlet hopper Figure 16 5.7.2.5 Rotating machine (see Figure 17)

Key
non food area
food area 1 inlet spout 2 rotor 3 screen / sieve 4 inner surfaces 5 outlet hopper Figure 17 5.7.2.6 Impact machine (impactor) (see Figure 18)

Key
non food area
food area 1 inlet spout 2 pins zone 3 outlet spout Figure 18 5.7.2.7 Impact machine (infestation destroyer) (see Figure 19)

Key
non food area
food area 1 inlet spout 2 pins zone 3 outlet spout Figure 19 5.7.3 Splash area Not present in these machines. 5.7.4 Non food area All parts not mentioned in 5.7.2. 5.8 Measures against fire and explosion hazards 5.8.1 Fire hazard The machines shall be designed and constructed in accordance with the requirements of EN 13478. 5.8.2 Explosion hazard The machines shall be designed and constructed in accordance with the principles and requirements of EN 1127-1, in particular concerning:  measures for avoiding or reducing potentially explosive atmospheres;  measures against potential ignition sources (static electricity, mechanical sparks, overheating of moving parts,…);  measures to reduce explosion effects.
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