SIST EN 12779:2005

SLOVENSKI STANDARD
SIST EN 12779:2005
01-april-2005
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Safety of woodworking machines - Chip and dust extraction systems with fixed
installation - Safety related performances and safety requirements
Sicherheit von Holzbearbeitungsmaschinen - Ortsfeste Absauganlagen für Holzstaub
und Späne - Sicherheitstechnische Anforderungen und Leistungen
Machines pour le travail du bois - Installations fixes d'extraction de copeaux et de
poussieres - Performances relatives a la sécurité et prescriptions de sécurité
Ta slovenski standard je istoveten z: EN 12779:2004
ICS:
79.120.10 Lesnoobdelovalni stroji Woodworking machines
SIST EN 12779:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 12779
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 79.120.10
English version
Safety of woodworking machines - Chip and dust extraction
systems with fixed installation - Safety related performances and
safety requirements
Machines pour le travail du bois - Installations fixes Sicherheit von Holzbearbeitungsmaschinen - Ortsfeste
d'extraction de copeaux et de poussières - Performances Absauganlagen für Holzstaub und Späne -
relatives à la sécurité et prescriptions de sécurité Sicherheitstechniche Anforderungen und Leistungen
This European Standard was approved by CEN on 20 October 2004.
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
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12779:2004: E
worldwide for CEN national Members.

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EN 12779:2004 (E)
Contents
page
Foreword.4
Introduction .5
1 Scope .6
2 Normative references .7
3 Terms, definitions, terminology and symbols .9
3.1 Terms and definitions .9
3.2 Terminology .12
3.3 Symbols and units.12
4 List of significant hazards .13
5 Safety requirements and/or measures .14
5.1 General.14
5.2 Controls .14
5.2.1 General.14
5.2.2 Safety and reliability of control systems.15
5.2.3 Position of and other requirements to controls .16
5.2.4 Mode selection.17
5.2.5 Speed changing .17
5.2.6 Failure of the power supply.18
5.2.7 Failure of control circuits.18
5.3 Protection against mechanical hazards .18
5.3.1 Stability of supports .18
5.3.2 Risk of break up during operation .18
5.3.3 Tool holder and tool design.18
5.3.4 Braking systems .18
5.3.5 Ejection .18
5.3.6 Work-piece support and guides.19
5.3.7 Prevention of access to moving parts.19
5.3.8 Automation and mechanisation .19
5.3.9 Clamping devices .19
5.3.10 Multi-station machines.19
5.3.11 Safety appliances.19
5.4 Protection against non-mechanical hazards .19
5.4.1 Fire and explosion .19
5.4.2 Noise .33
5.4.3 Emission of chips, dust and gases.36
5.5 Electricity.42
5.6 Ergonomics and handling.42
5.6.1 Electrical controls.42
5.6.2 Mechanical controls .42
5.7 Lighting.42
5.8 Pneumatics.42
5.9 Hydraulics.42
5.10 Vibration .43
5.11 Laser .43
5.12 Static electricity .43
5.13 Errors of fitting.43
5.14 Isolation .43
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EN 12779:2004 (E)
5.15 Maintenance.44
6 Information for use.44
6.1 General .44
6.2 Warning .44
6.2.1 Warning devices .44
6.2.2 Warning signs.44
6.3 Marking.45
6.4 Instruction handbook.45
6.4.1 General .45
6.4.2 Performance.46
6.4.3 Explosion protection and safety systems .46
6.4.4 Information for use.47
6.4.5 Maintenance practice.47
6.4.6 Noise declaration.48
Annex A (informative)  Table with corresponding terms in English, French and German.49
Annex B (informative)  Relationship between airflow, vacuum, air velocity and power
consumption .53
Annex C (informative) Verification of performance measurement.56
Annex D (normative)  Noise reduction at the design stage .58
Annex E (informative)  Air velocity and extraction hood design.60
Annex ZA (informative)  Clauses of this document addressing essential requirements or other
provisions of EU Directives.62
Bibliography.63

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EN 12779:2004 (E)
Foreword
This document (EN 12779:2004) has been prepared by Technical Committee CEN/TC 142 “Woodworking
machines - Safety”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2005 and conflicting national standards shall be withdrawn at the
latest by June 2005.
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.
The European Standards produced by CEN/TC 142 are particular to woodworking machines and compliment
the relevant “A” and “B” standards on the subject of general safety (see introduction of
EN ISO 12100-1:2003 for a description of A, B and C standards).
This standard for Chip and dust extraction systems with fixed installation will be followed by a separate
standard for Semi-stationary chip and dust extraction machines.
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 12779:2004 (E)
Introduction
This standard has been prepared to be a harmonized standard to provide one means of conforming to the
Essential Health and Safety Requirements of the Machinery Directive and associated EFTA Regulations. This
document is a type “C” standard as defined in EN ISO 12100-1:2003.
The machinery concerned and the extent to which hazards, hazardous situations and events 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 other standards, for machines
that have been designed and built in accordance with the provisions of this type C standard.
The requirements of this document are directed to manufacturers and their authorised representatives of chip
and dust extraction systems. It is also useful for designers.
This document also includes information, which can be provided by the manufacturer to the user.
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EN 12779:2004 (E)
1 Scope
This document sets out the safety related performance requirements and specifies the methods for elimination
of hazards or the measures that shall be taken to minimise hazards, which cannot be eliminated, on chip and
dust extraction systems with fixed installation as defined in 3.1.1 and 3.1.2, for the purpose of this standard,
hereinafter referred to as extraction system, connected to woodworking machines, designed to process solid
wood, chipboard, fibreboard, plywood and also these materials where these are covered with plastic laminate
or edgings. The extraction and conveying system operates pneumatically by vacuum and/or pressure between
± 0,3 bar.
This standard does not:
3 -1
a) apply to fixed installations with an air flow capacity below 6 000 m h installed indoors;
3 -1
b) apply to moveable units with an air flow capacity below 6 000 m h ;
c) apply to extraction equipment (e.g. extraction hoods, ducts) within a woodworking machine i.e. up to
and including the outlet to which the extraction system is coupled;
d) apply to extraction systems connected to machines processing non-wood materials, such as plastic,
plastic laminates, metals, glass or stone;
e) deal with the hazards from contact with or inhalation of dusts from wood coated with lacquer, plastic,
aluminium and material with high additive contents or similar;
f) deal with shop fresh air supply;
-1
g) apply to chip and dust extraction systems designed for K values above 200 bar ms ;
st
h) apply to the silo discharge system;
i) cover the hazards related to Electromagnetic Compatibility (EMC) as required by the EMC Directive
89/336/EEC dated 3-5-89.
This document deals with the interaction with the silo discharge system if any.
This document covers the hazards relevant to these machines as stated in Clause 4. document
Directive 94/9/EC concerning equipment and protective systems intended for use in potentially explosive
atmospheres can be applicable to the type of machine or equipment covered by this document.
The present standard is not intended to provide means of complying with the Essential Health and Safety
Requirements (EHSR) of Directive 94/9/EC.
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EN 12779:2004 (E)
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 418:1992, Safety of machinery - Emergency stop equipment, functional aspects - Principles for design
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
EN 982:1996, Safety of machinery - Safety requirements for fluid power systems and their components –
Hydraulics
EN 983:1996, Safety of machinery - Safety requirements for fluid power systems and their components –
Pneumatics
EN 1127-1:1997, Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and
methodology
EN 1366-1:1999, Fire resistance tests on service installations - Part 1: Ducts
EN 1366-2:1999, Fire resistance tests for service installations - Part 2: Fire dampers
EN 13284-1:2001, Stationary source emissions - Determination of low range mass concentration of dust - Part
1: Manual gravimetric method
EN 60204-1:1997, Safety of machinery - Electrical equipment of machines - Part 1: General requirements
(IEC 60204-1:1997)
EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 60947-4-1:2001, Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-starters (IEC 60947-4-1:2000).
EN 60947-5-1:2004, Low-voltage switchgear and controlgear - Part 5-1: Control circuit devices and switching
elements - Electromechanical control circuit devices (IEC 60947-5-1:2003).
EN ISO 11202:1995, Acoustics - Noise emitted by machinery and equipment - Measurement of emission
sound pressure levels at a work station and at other specified positions - Survey method in situ (ISO
11202:1995)
EN ISO 11688-1:1998, Acoustics - Recommended practice for the design of low-noise machinery and
equipment - Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100-1:2003, Safety of machinery - Basic concepts, general principles for design - Part 1: Basic
terminology and methodology (ISO 12100-1:2003)
EN ISO 12100-2:2003, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
principles and specifications (ISO 12100-2:2003)
EN ISO 14122-2:2001, Safety of machinery - Safety means of permanent access to machinery - Part 2:
Working platforms and gangways (ISO 14122-2:2001)
EN ISO 14122-3:2001, Safety of machinery - Permanent means of access to machinery - Part 3: Stairs,
stepladders and guard rails (ISO 14122-3:2001)
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EN 12779:2004 (E)
EN ISO 14122-4:2004, Safety of machinery - Permanent means of access to machinery - Part 4: Fixed
ladders (ISO 14122-4:2004)
ISO 7000:2004, Graphical symbols for use on equipment - Index and synopsis
ISO 10816-1:1995, Mechanical vibration - Evaluation of machine vibration by measurements on non-rotating
parts - Part 1: General guidelines
HD 22.1 S4:2002, Cables of rated voltages up to and including 450/750 V and having cross-linked insulation -
Part 1: General requirements.

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EN 12779:2004 (E)
3 Terms, definitions, terminology and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003 and the following
apply.
3.1.1
chip and dust extraction system
wood waste handling system including ducting, fans, filters, cyclones and storage facilities, including silo
except its discharge system. The system is intended for conveyance, separation and storage of chips and
dust from woodworking machines.
A typical example of an extraction system with fixed installation is illustrated as the shaded part of Figure 1

Figure 1 — Chip and dust extraction system
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EN 12779:2004 (E)
3.1.2
fixed installation
extraction system which is permanently located and installed, or a moveable extraction system with air flow
3 -1
capacity greater than 6 000 m h
3.1.3
chips
particles of wood emanating from processing at woodworking machines. The particle size for chips is set to
equal or greater than 0,5 mm
3.1.4
dust
particles of wood emanating from processing at woodworking machines. The particle size for dust is set to less
than 0,5 mm
3.1.5
ducting
pipe-work, connecting woodworking machines to the fans and separators
3.1.6
main duct
duct to which branch ducts from a group of machines are connected
3.1.7
fan
component which produces the airflow for conveying chips and dust within the system
3.1.8
separator
device for separation of chips and dust from the conveying air
NOTE Filters and cyclones are examples of separators.
3.1.9
silo
fixed installed equipment for storage of chips and dust
3.1.10
bin
3
movable equipment with a volume up to 0,5 m for storage of chips and dust
3.1.11
container
3
movable equipment with a volume over 0,5 m for storage of chips and dust
3.1.12
silo discharge system
system which continually or intermittently empties chips and dust from silo/container
3.1.13
emptying system
system which continually or intermittently removes chips and dust from the separator
3.1.14
transport system
system to convey chips and dust from one or more separator or silo to other parts of the extraction system
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EN 12779:2004 (E)
3.1.15
extraction vacuum
static vacuum in a duct connecting point of a pneumatic extraction system
3.1.16
air velocity
average velocity of the air inside a duct, calculated over the whole cross section and which allows the
determination of the air flow rate (see Figure 2)
3.1.17
capture velocity
minimum air velocity that will draw the chips and dust towards the extraction hood (see Figure 2)
1
2

Key
1 Air velocity
2 Capture velocity
Figure 2 — Air velocities
3.1.18
concurrency factor
ratio in percent between the actual planned maximum air flow and the total air flow demand of all machines
connected to the extraction system
3.1.19
K value
st
explosive characteristic of combustible dust in air
NOTE K values are detailed in EN 26184-1.
st
3.1.20
dust loaded part
dust loaded interior of the extraction system including ducting, silo, container, bin, separator etc. from the duct
inlet connected to the wood working machine to the filter medium surface, where the air filtration is performed
3.1.21
clean air part
interior of the extraction system from the filter medium surface, where the air filtration is performed, to the air
outlet
3.1.22
return air
filtered air reintroduced into the working area
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EN 12779:2004 (E)
3.1.23
servicing level
level on which persons stand when operating or maintaining the equipment
3.2 Terminology
List of corresponding terms in English, French and German is included in Annex A.
3.3 Symbols and units
Following symbols and units are used in this document:
Parameter SymbolUnit
Diameter D mm
Length L m
2
Area S m
3
Volume V m
-1
Air velocity v ms
3 -1
Air flow Q m h
a
Pressure p Pa
Pressure differential Pa
∆
p
0
Temperature t C
Power P kW
-1
Material flow Q kgh
m
-1
K value K bar ms
st st
Fan efficiency η %
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EN 12779:2004 (E)
4 List of significant hazards
This standard deals with all the significant hazards relevant to the extraction system defined in the scope:
 for significant hazards, by defining safety requirements and/or measures or by reference to relevant B
standards;
 for general, minor or secondary aspects, by reference to relevant A standards, especially
EN ISO 12100-1.
These hazards are listed below in accordance with Annex A of EN 1050:1996 which is based on
EN ISO 12100-1:2003 and EN ISO 12100-2:2003 with one additional item (7.4).
Table 1 — List of significant hazards
Number Hazard Relevant sub-clauses of this
document
1 Mechanical hazards caused for example by:
- shape;
- relative location;
- mass and stability (potential energy of elements);
- mass and velocity (kinetic energy of elements);
- inadequacy of the mechanical strength.
Accumulation of potential energy by:
- elastic elements (springs); or
- liquids or gases under pressure; or
- vacuum.
of the machine parts or workpieces.
1.1 Crushing hazard 5.4.1.7; 5.3.7
1.2 Shearing hazard 5.4.1.7; 5.3.7
1.3 Cutting or severing hazard 5.4.1.7; 5.3.7
1.4 Entanglement hazard 5.4.1.7; 5.3.7
1.10 Ejection of parts (of machinery and processed 5.3.2
materials/workpieces)
1.11 Loss of stability of machinery and machine parts 5.3.1; 5.10
1.12 Slip, trip and fall hazards in relationship with machinery 5.4.1.7; 5.6.2
(because of their mechanical nature)
2 Electrical hazards caused for example by:
2.1 Electrical contact (direct or indirect) 5.2.2; 5.5
2.2 Electrostatic phenomena 5.4.1.4; 5.12
3 Thermal hazards resulting in:
3.1 Burns and scalds, by a possible contact of persons, by 5.4.1
flames or explosion and also by the radiation of heat
sources
4 Hazards generated by noise resulting in:
4.1 Hearing losses (deafness), or other physiological 5.4.2; 6.4.6
disorders (e.g. loss of balance, loss of awareness)
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EN 12779:2004 (E)
Table 1 — List of significant hazards (continued)
Number Hazard Relevant sub-clauses of this
document
7 Hazards generated by materials and substances
processed, used or exhausted by machinery for example:
7.1 Hazards resulting from contact with or inhalation of 5.4.3
harmful fluids, gases, mists, fumes and dust
7.2 Fire or explosion hazard 5.4.1
7.4 Suffocation and drowning 5.4.1.7
8 Hazards generated by neglecting ergonomic principles in
machine design (mismatch of machinery with human
characteristics and abilities) caused for example by :
8.3 Neglect of use of personal protection equipment 6.4.5
8.6 Human error 5.15; 6.4
10 Hazards caused by failure of energy supply breaking
down of machinery parts and other functional disorders,
for example:
10.1 Failure of energy supply (of energy and/or control circuits) 5.2.5; 5.8
10.2 Unexpected ejection of machine parts or fluids 5.3.2
10.3 Failure, malfunction of control systems (unexpected start 5.2.2
up, unexpected overrun)
10.4 Errors of fitting 5.4.3.2.1
10.5 Overturn, unexpected loss of machine stability 5.3.1; 5.10
11 Hazards caused by (temporary) missing and/or incorrectly
positioned safety related measures/means for example:
11.1 All kinds of guard 5.3.7; 5.4.1.7
11.2 All kinds of safety related (protection) devices 5.2.2
11.3 Starting and stopping devices 5.2.3; 5.6.2
11.4 Safety signs and signals 5.4.3.1.2; 6.2; 6.3
11.5 All kinds of information and warning devices 6.2
...