EN 12779:2004

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

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
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

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.
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.
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.
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)
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.
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
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
movable equipment with a volume up to 0,5 m for storage of chips and dust
3.1.11
container
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
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)
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
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
Area S m
Volume V m
-1
Air velocity v ms
3 -1
Air flow Q m h
a
Pressure p Pa
Pressure differential Pa
∆
p
Temperature t C
Power P kW
-1
Material flow Q kgh
m
-1
K value K bar ms
st st
Fan efficiency η %
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)
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
11.6 Energy supply disconnection devices 5.2.2; 5.2.3; 5.14
11.7 Emergency devices 5.2.2; 5.2.3.4
11.9 Essential equipment and accessories for safe adjusting 5.15; 6.4.5
and/or maintaining
5 Safety requirements and/or measures
5.1 General
The machine shall comply with the safety requirements and/or protective measures of this clause. In addition,
the machine shall be designed in accordance with the principles of EN ISO 12100-1:2003 for hazards relevant
but not significant, which are not dealt with by this document (e.g. sharp edges).
For guidance in connection with risk reduction by design, see Clause 4 of EN ISO 12100-2:2003 and for
safeguarding measures see Clause 5 of EN ISO 12100-2:2003.
5.2 Controls
5.2.1 General
For the purpose of this standard all electrical equipment shall comply with the requirements of
EN 60204-1:1997, and in addition:
5.2.2 Safety and reliability of control systems
For the purpose of this standard a safety related control system means the system controlling the extraction
system from and including automatic blast gate(s) with detector(s) in the feeding system to the connected
woodworking machine(s) if any are present, to the silo filling system including the final level switch in the silo.
The safety related control systems of this machine are those for:
 emergency stopping (see 5.2.3.4);
 interlocking (see 5.3.7 and 5.4.1.7);
 fire detection (see 5.4.1.5);
 starting (see 5.2.3.2);
 normal stopping (see 5.2.3.3);
 sequence interlocking (see 5.2.3.2, 5.2.3.3 and 5.2.3.4);
 indication of extraction vacuum (see 5.4.3.1.2);
 return air monitoring (see 5.4.3.2.2);
 detection of pressure difference in separators (5.4.3.1.2);
 detection of the emptying system function;
 detection of silo/container filling.
The control systems for emergency stopping and for interlocking shall as minimum be Category 1 in
accordance with the requirements of EN 954-1:1996 and shall be “hardwired”.
The other control systems can be equipped with an electronic system.
Well-tried components and principles for the purpose of this standard are:
a) electrical components if they comply with relevant standards including the following as:
1) EN 60947-5-1:2004 (Section 3) for control switches with positive opening operation used as
mechanically actuated position detectors for interlocking of guards and for relays used in auxiliary
circuits;
2) EN 60947-4-1:2001 for electromechanical contactors and motor starters used in main circuits;
3) HD 22.1 S4:2002 for rubber insulated cables;
4) HD 21.1 S4:2002 for polyvinyl chloride cable if these cables are additionally protected against
mechanical damage by positioning (e.g. inside frames).
b) electrical principles if they comply with measures listed from first to fourth paragraph in 9.4.2.1of
EN 60204-1:1997. The circuits shall be "hardwired“. Electronic components alone do not satisfy the “well-
tried" requirements;
c) mechanical components if, for example, they operate in the positive mode in accordance with the
description given in 4.5 of EN ISO 12100-2:2003;
d) mechanically actuated position detectors for guards if they are actuated in positive mode and their
arrangement/fastening and the cam design/mounting comply with the requirements of 5.2 and 5.3 of EN
1088:1995;
e) interlocking devices with guard locking if they satisfy the requirements described in 5.3.7;
f) pneumatic and hydraulic components and systems if they comply with the requirements of
EN 983:1996 and EN 982:1996 respectively;
g) detectors and indicators if they comply with the requirements of Category B of EN 954-1:1996;
h) time delay relays if they comply with the requirements of Category B of EN 954-1:1996 and are
designed for 1 million operations.
The control systems including detectors, indicators and time delay relays (5.2.2 g) and 5.2.2 h)) shall as a
minimum be of Category B in accordance with the requirements of EN 954-1:1996.
For the purpose of this standard Programmable Logic Controllers (PLC) are considered as Category B.
Verification : By visual inspection of the extraction system and by checking the relevant drawings and/or circuit
diagrams. For any components by requiring confirmation from the manufacturer of the component which
conforms to the relevant standards.
5.2.3 Position of and other requirements to controls
5.2.3.1 General
All electrical controls shall be placed at a minimum height of 600 mm and a maximum height of 1 800 mm
from the servicing level.
(For the position of emergency stop controls see 5.2.3.4).
Verification: By visual inspection and measurement on the extraction system.
5.2.3.2 Starting
The starting conditions shall comply with the requirements in 9.2.5.2 of EN 60204-1:1997 (also see 6.4.4).
For extraction systems with an automatic emptying system, the starting sequence shall ensure that the
emptying system is running prior to starting the extraction system.
NOTE For example the transport system between a filter and silo shall run normally before the extraction system
connected to the woodworking machine is started.
After the emergency stop has been activated and reset, the extraction system shall perform a sequence that
brings it to a point where a normal start up can be performed.
Verification: By visual inspection, checking the relevant diagrams and functional testing on the extraction
system.
5.2.3.3 Normal stopping
The extraction system shall be fitted with a system stop control which, when actuated, shall provide a shut-
down of all components in a predetermined sequence as defined by the manufacturer (see 6.4.4).
NOTE An example of a predetermined sequence is when the filter regeneration system has stopped, the filter
emptying system shall continue until it has cleaned itself.
Any individual component stop control shall at least stop all components of the extraction system prior to the
individual component in the correct sequence of operation.
Verification: By visual inspection, checking the relevant diagrams and functional testing on the extraction
system.
5.2.3.4 Emergency stop
The emergency stop function shall be of Category 1 in accordance with the requirements of EN 60204-1:1997.
Emergency stop devices shall meet the requirements of EN 418:1992 and 9.2.5.4 and 10.7 of
EN 60204-1:1997 and shall be provided as follows:
a) on the control panel where the normal electrical controls are situated;
b) a maximum of 50 m from all electrically connected parts of the extraction system;
c) a minimum of one emergency stop in each room with electrical parts or mechanical driven parts
connected to the extraction system;
d) be directly accessible from any frequently used moveable interlocked guard (see 5.3.7) and if
necessary any other point of access.
Examples of emergency stop location are shown in Figure 3.
A recommendation that the extraction system is re-started, as soon as the emergency situation has been
cleared, shall be included in the instruction handbook (see 6.4.4 and 5.2.3.2).
Verification: By visual inspection, checking the relevant diagrams and functional testing on the extraction
system.
Key
1 Electrical
2 Control panel
Figure 3 — Examples of emergency stop control location
5.2.4 Mode selection
If a mode selection switch is provided (e.g. for selecting between normal mode of operation and setting mode
of operation for silo’s equipped with an automatic silo discharge system (see 5.4.1.7 m)) it shall be of the
lockable type.
5.2.5 Speed changing
Not relevant.
50m
5.2.6 Failure of the power supply
Automatic re-starting of the extraction system shall be prevented (see 7.5 paragraphs 1 and 3 of
EN 60204-1:1997).
When actuating the start control after failure of the power supply, the extraction system shall, before entering
the normal starting sequence, perform a sequence in accordance with the requirements of 5.2.3.2 that brings
the system into a position where a normal start up can be performed.
Verification: By visual inspection, checking the relevant diagrams and functional testing on the extraction
system.
5.2.7 Failure of control circuits
See 5.2.2.
5.3 Protection against mechanical hazards
5.3.1 Stability of supports
All parts of the extraction system support structure shall be designed so that they can carry, at the same time,
the weight of the component itself (e.g. duct, fan, separator or rotary valve) and any foreseeable additional
-3
load (e.g. the weight of unintended wood waste filled component interior (150 kgm ), maintenance persons
(100 kg per person), scaffoldings, reactions from internal movements, wind load, snow etc.)
Support structures for components with explosion relief shall also be able to withstand reaction forces resulting
from the explosion blast wave.
NOTE 1 CEN/TC 305/WG 3 standards can provide helpful information (see Bibliography).
Fan supports shall be able to withstand the unbalance requirements shown in 5.10.
NOTE 2 For more information see 5.2.6 of EN ISO 12100-2:2003.
Verification: By requiring confirmation from the manufacturer of the relevant components and by calculation
based on measurements and/or technical specifications.
5.3.2 Risk of break up during operation
Fans and components (e.g. ducts, separators and rotary valves) adjacent to the fan outlet shall be designed
taking into account the stresses they are subject to (see 4.3 of EN ISO 12100-2:2003).
Verification: By requiring confirmation from the manufacturer of the relevant components and by calculation
based on measurements and/or technical specifications.
5.3.3 Tool holder and tool design
Not relevant.
5.3.4 Braking systems
Not relevant.
5.3.5 Ejection
Not relevant.
5.3.6 Work-piece support and guides
Not relevant.
5.3.7 Prevention of access to moving parts
Powered moving elements (e.g. fan wheels, chain conveyors, rotary valves, screw conveyors and automatic
blast gates) of the extraction system shall be guarded with a fixed guard.
Where an opening is provided for frequent access (e.g. for setting, adjustment or cleaning) such openings
shall be via a moveable guard interlocked with the dangerous movement of the extraction system. For the
purpose of this standard frequent is more than once per week.
Any moving component (e.g. fans and rotary valves) with a run down time greater than 10 s and guarded by
an interlocking guard shall also have guard locking.
Guards shall comply with the requirements of EN 953:1997 and the safety distances in EN 294:1992.
Verification: By visual inspection of the extraction system, measurement and checking the relevant drawings.
5.3.8 Automation and mechanisation
Not relevant.
5.3.9 Clamping devices
Not relevant.
5.3.10 Multi-station machines
Not relevant
5.3.11 Safety appliances
Not relevant.
5.4 Protection against non-mechanical hazards
5.4.1 Fire and explosion
5.4.1.1 General
Extraction systems shall be located and be constructed such that sources of ignition, fire and explosion are
removed and risks caused by fire and explosion are minimised.
Extraction systems connected to woodworking machines processing only wood shall be designed with a K
st
-1
value of 200 bar ms .
If the extraction system is connected to woodworking machines processing wood combined with non-wood
material (e.g. lacquer, laminate and aluminium) it is recommended to evaluate whether the K value is above
st
-1
200 bar ms . If this is the case additional safety measures may be required (e.g. fire extinguishing devices,
additional explosion relief, safety valves, added strength construction).
Verification: By checking the relevant drawings and visual inspection of the extraction system.
5.4.1.2 Location of separator, fan and silo
The separator, fan and wood waste accumulation system shall be located outdoors (outside the working
areas) or in specially designed rooms/buildings.
The separator, fan and silo shall be located in a safe or non-hazardous area.
Verification: By visual inspection of the extraction system.
5.4.1.3 Wood waste accumulation in ducts and separators
The conveying air velocity in all parts of the ducting shall be sufficient to avoid accumulation of wood waste in
-1
the ducts. The minimum conveying air velocity for dry wood waste shall be 20 m s as an average on an
hourly basis.
Inspection and cleaning of the ducting shall be made possible by means of inspection doors or easily
detachable assemblies.
Examples of access methods for the inspection and cleaning of ducts are shown in Figure 4.

Figure 4 — Examples of duct access for inspection and cleaning
Ducts, branch ducts, inspection doors, dampers, blast-gates, fire-gates etc. in ducting conveying chips and
dust shall be designed in such a way that all the chips always pass through without the risk of hanging.
If a mesh or a grate that can cause hanging is necessary in the extraction system, its function shall be
controlled and a means for monitoring shall be provided (e.g. a pressure loss indicator window for visual
inspection).
Separators shall be designed such that the material build-up within the filter housing is less than 200 l per
3 -1
1 000 m h of air-flow-capacity.
3 -1
NOTE 1 The 200 l/1 000 m h value is made up from 2 main elements:
a) surface build-up of waste on the filter sleeves;
b) build-up of waste in the filter hopper prior to release into the transport system.
NOTE 2 The cleaning cycle normally takes place before the build up on the filter surface is greater than 15 l/m . This
corresponds to an average thickness of 15 mm of material on the filter surface.
Example of dust build-up is shown in Figure 5.
Verification: By visual inspection, calculations, measurements and functional testing on the extraction system.
Key
1 Dust build-up
Figure 5 — Example of chip and dust build-up in a reverse air cleaned filter
5.4.1.4 Ignition sources
Components of the extraction system shall be designed in such a way that ignition sources are not generated
by normal use and wear.
NOTE 1 Ignition sources cannot be eliminated due to the nature of the machines connected to the extraction systems.
The risk of ignition sources will depend on the type of machine.
NOTE 2 For extraction systems including sanding m
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