prEN 12921

SLOVENSKI STANDARD
01-maj-2026
Naprave za površinsko čiščenje in predobdelavo industrijskih proizvodov s
pomočjo tekočin ali par - 1. del: Varnostne zahteve
Machines for surface cleaning and pre-treatment of industrial items using liquids or
vapours - Safety requirements
Maschinen zur Oberflächenreinigung und -vorbehandlung von industriellen Produkten
mittels Flüssigkeiten oder Dampfphasen - Sicherheitsanforderungen
Machines de nettoyage et de pré-traitement de pièces industrielles utilisant des liquides
ou des vapeurs - Prescriptions de sécurité
Ta slovenski standard je istoveten z: prEN 12921
ICS:
97.080 Aparati za čiščenje Cleaning appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2026
ICS 97.080 Will supersede EN 12921-1:2005+A1:2010, EN
12921-2:2005+A1:2008, EN 12921-3:2005+A1:2008,
EN 12921-4:2005+A1:2008
English Version
Machines for surface cleaning and pre-treatment of
industrial items using liquids or vapours - Safety
requirements
Machines de nettoyage et de pré-traitement de pièces Maschinen zur Oberflächenreinigung und -
industrielles utilisant des liquides ou des vapeurs - vorbehandlung von industriellen Produkten mittels
Prescriptions de sécurité Flüssigkeiten oder Dampfphasen -
Sicherheitsanforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 271.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12921:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 9
3 Terms and definitions . 12
4 Safety requirements and/or protective/risk reduction measures . 12
4.1 Materials and products . 12
4.2 Lighting . 12
4.3 Ergonomics . 12
4.3.1 Operation . 12
4.3.2 Maintenance . 13
4.3.3 Control devices . 13
4.3.4 Warning devices . 13
4.4 Operating positions . 13
4.5 Protection against corruption . 13
4.6 Control systems . 13
4.6.1 Safety and reliability of control systems . 13
4.6.2 Design and construction of control systems . 14
4.6.3 Control devices . 14
4.6.4 Starting, stopping, selection of operation modes and prevention of unexpected
startup . 14
4.6.5 Emergency stop . 14
4.6.6 Assembly of machinery . 14
4.6.7 Failure of the power supply or communication network connection . 14
4.7 Mechanical . 14
4.7.1 Loss of stability . 14
4.7.2 Break-up during operation . 15
4.7.3 Falling objects . 16
4.7.4 Surfaces, edges or angles. 16
4.7.5 Moving parts . 16
4.7.6 Protection against risks arising from moving parts . 17
4.7.7 Uncontrolled movements . 17
4.8 Electricity . 17
4.8.1 General. 17
4.8.2 External influences on the electrical equipment. 18
4.9 Energy supply other than electricity . 18
4.9.1 Pneumatic . 18
4.9.2 Hydraulic. 18
4.9.3 Fuelgas . 18
4.10 Extreme temperatures . 18
4.10.1 Hot surfaces . 18
4.10.2 Ejection of hot liquids . 19
4.10.3 Heating system . 19
4.11 Fire . 19
4.11.1 Fire load of machinery parts . 19
4.11.2 Machinery processing flammable substances . 19
4.12 Explosion . 20
4.12.1 General . 20
4.12.2 Measures to avoid explosive atmosphere. 20
4.12.3 Ignition protection . 22
4.13 Noise . 23
4.14 Emission of hazardous substances . 24
4.14.1 General . 24
4.14.2 Enclosure of the process area . 24
4.14.3 Maintaining underpressure in the process area . 25
4.14.4 Overfilling . 26
4.14.5 Liquid carrying machine parts . 26
4.14.6 Draining . 27
4.15 Being trapped . 27
4.16 Slipping, tripping and falling . 27
4.17 Lightning . 27
4.18 Maintenance . 28
4.18.1 General . 28
4.18.2 Isolation of energy sources . 28
5 Verification of safety requirements and/or protective/risk reduction measures . 28
6 Information for use . 46
6.1 General . 46
6.2 Instruction for use . 46
6.2.1 General . 46
6.2.2 Instruction for installation . 47
6.2.3 Instructions for operation . 48
6.2.4 Instructions for maintenance . 48
6.3 Marking . 49
6.3.1 General . 49
6.3.2 Prohibition and warning signs . 49
6.3.3 Type plate . 50
6.4 Sales literature . 50
Annex A (informative) Hazards . 51
Annex B (informative) Energy-efficiency and reduction of environmental impact . 54
B.1 General . 54
B.2 Machinery . 54
Annex C (informative) Noise emission declaration . 56
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2023/1230 aimed to be covered . 58
Bibliography . 61
European foreword
This document (prEN 12921:2026) has been prepared by Technical Committee CEN/TC 271 “Surface
treatment equipment - Safety”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12921-1:2005+A1:2010, EN 12921-2:2005+A1:2008,
EN 12921-3:2005+A1:2008 and EN 12921-4:2005+A1:2008.
EN 12921-1:2005+A1:2010, EN 12921-2:2005+A1:2008, EN 12921-3:2005+A1:2008 and
EN 12921-4:2005+A1:2008:
a) the four parts of the EN 12921 series have been merged into one document;
b) requirements for minimization of contact with process liquid, aerosol and vapours have been
added as 4.1 and 4.14;
c) requirements for lighting have been added as 4.2;
d) requirements for ergonomics have been added as 4.3;
e) requirements for operating positions have been added as 4.4;
f) requirements for protection against corruption have been added as 4.5;
g) requirements for controls (e.g. required performance level) have been updated as 4.6;
h) requirements for mechanical safety have been revised as 4.7;
i) requirements for surfaces, edges or angles have been added as 4.7.4;
j) requirements for design of electrical equipment to withstand thermal and chemical influences have
been added as 4.8.2;
k) requirements for pneumatic power, hydraulic power and fuelgas supply have been added as 4.9;
l) requirements for protection against hot surfaces have been added in more detail as 4.10.1;
m) requirements for protection against hot liquids have been added as 4.10.2;
n) requirements for fire protection have been added in more detail as 4.11;
o) requirements for explosion protection have been restructured with more detail added as 4.12;
p) requirements for protection against noise have been updated as 4.13;
q) requirements for protection against hazardous substances have been updated as 4.14;
r) requirements for protection against entrapment have been added as 4.15;
s) requirements for protection against slipping, tripping and falling have been updated as 4.16;
t) requirements for protection against lightning have been added as 4.17;
u) requirements for maintenance oriented machine design have been added as 4.18.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Introduction
This document is a type-C standard as stated in EN ISO 12100:2010.
This document is of relevance, in particular, for the following stakeholder groups representing the
market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.).
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions);
— service providers, e.g. for maintenance (small, medium and large enterprises).
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this document.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events
are covered are indicated in the Scope of this document.
When requirements of this type-C standard are different from those which are stated in type-A or type-
B standards, the requirements of this type-C standard take precedence over the requirements of the
other standards for machines that have been designed and built according to the requirements of this
type-C standard.
1 Scope
This document specifies safety requirements and recommendations for environmental aspects for
cleaning and pretreatment machinery.
This document specifies requirements against all significant hazards, hazardous situations and
hazardous events relevant to cleaning and pretreatment machinery, when they are used as intended,
including reasonably foreseeable misuse.
See Annex A for significant hazards.
This document also specifies in Annex B recommendations for minimizing environmental impact of
cleaning and pretreatment machinery.
Interfaces between cleaning and pretreatment machinery and potentially connected equipment not in
scope are given in Figure 1.
Key
Cleaning and pretreatment machine

Element / system of cleaning and pretreatment machine

System out of scope
1 Connector to fresh air supply
2 Interface to conveying or handling system
3 Waste output connector
4 New treatment products input connector
5 Connector to electrical power supply
6 Connector to fuel supply
7 Connector to pressurized air supply
8 Connector to water supply
9 Connector to cooling water supply
10 Connection to external fire extinguishing system
11 Connector to exhaust air treatment system
Figure 1 — Interfaces between cleaning and pretreatment machinery and potentially connected
equipment not in scope
The specific significant risks related to the use of this machinery with foodstuff and pharmaceutical
products are not dealt with in this document.
This document does not apply to:
a) high pressure water jet machinery according to EN 1829-1:2021;
b) inerted cleaning and pretreatment machinery;
c) surface-cleaning appliances for household use employing liquids or steam according to
EN 60335-2-54:2008 ;
d) high pressure cleaners and steam cleaners according to EN 60335-2-79:2012, modified;
e) cleaning and pretreatment equipment installed in paint application booths;
f) shot blasting machinery according to EN ISO 23779:2025;
g) dry ice blasting machines;
h) laser surface cleaning machinery;
i) plasma surface cleaning machinery;
j) electroplating machinery according to EN 17059:2018.
This document does not apply to cleaning and pretreatment machines manufactured before the date of
its publication as an European standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 547-1:1996+A1:2008, Safety of machinery — Human body measurements — Part 1: Principles for
determining the dimensions required for openings for whole body access into machinery
EN 809:1998+A1:2009, Pumps and pump units for liquids — Common safety requirements
EN 1005-3:2002+A1:2008, Safety of machinery — Human physical performance — Part 3: Recommended
force limits for machinery operation
EN 1570-1:2024, Safety requirements for lifting tables — Part 1: Lifting tables serving up to two fixed
landings
EN 1837:2020, Safety of machinery — Integral lighting of machines
EN 14462:2015, Surface treatment equipment — Noise test code for surface treatment equipment
including its ancillary handling equipment — Accuracy grades 2 and 3
EN 17059:2018, Plating and anodizing lines — Safety requirements
EN 60204-1:2018, Safety of machinery — Electrical equipment of machines — Part 1: General
requirements (IEC 60204-1:2016, modified)
EN 61310-1:2008, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for
visual, acoustic and tactile signals (IEC 61310-1:2007)
EN IEC 61496-1:2020, Safety of machinery — Electro-sensitive protective equipment — Part 1: General
requirements and tests (IEC 61496-1:2020)

As impacted by EN 809:1998+A1:2009/AC:2010
As impacted by EN 60204-1:2018/A1:2025
EN IEC 61496-2:2020, Safety of machinery — Electro-sensitive protective equipment — Part 2: Particular
requirements for equipment using active opto-electronic protective devices (AOPDs) (IEC 61496-2:2020)
EN IEC 60079-0:2018, Explosive atmospheres — Part 0: Equipment — General requirements (IEC 60079-
0:2017)
EN IEC 62305-1:2024, Protection against lightning — Part 1: General principles (IEC 62305-1:2024)
EN IEC 62305-2:2024, Protection against lightning — Part 2: Risk management (IEC 62305-2:2010,
modified)
EN IEC 62305-3:2024, Protection against lightning – Part 3: Physical damage to structures and life
hazard — Supplement 2: Additional information for special structure
EN ISO 4413:2010, Hydraulic fluid power — General rules and safety requirements for systems and their
components (ISO 4413:2010)
EN ISO 4414:2010, Pneumatic fluid power — General rules and safety requirements for systems and their
components (ISO 4414:2010)
EN ISO 10218-2:2025, Robotics — Safety requirements — Part 2: Industrial robot applications and robot
cells (ISO 10218-2:2025)
EN ISO 11688-1:2009, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk
reduction (ISO 12100:2010)
EN ISO 13577-2:2023, Industrial furnaces and associated processing equipment — Safety — Part 2:
Combustion and fuel handling systems (ISO 13577-2:2023)
EN ISO 13849-1:2023, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design (ISO 13849-1:2023)
EN ISO 13854:2019, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
(ISO 13854:2017)
EN ISO 13856-1:2013, Safety of machinery — Pressure-sensitive protective devices — Part 1: General
principles for design and testing of pressure-sensitive mats and pressure-sensitive floors (ISO 13856-
1:2013))
EN ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by
upper and lower limbs (ISO 13857:2019)
EN ISO 14119:2025, Safety of machinery — Interlocking devices associated with guards — Principles for
design and selection (ISO 14119:2024)
EN ISO 14120:2015, Safety of machinery — Guards — General requirements for the design and
construction of fixed and movable guards (ISO 14120:2015)

As impacted by EN IEC 60079-0:2018/A11:2024 and EN IEC 60079-0:2018/AC:2020-02
EN ISO 14122-2:2016, Safety of machinery — Permanent means of access to machinery — Part 2:
Working platforms and walkways (ISO 14122-2:2016)
EN ISO 14122-3:2016, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs,
stepladders and guard-rails (ISO 14122-3:2016)
EN ISO 14122-4:2016, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed
ladders (ISO 14122-4:2016)
EN ISO 19353:2019, Safety of machinery — Fire prevention and fire protection (ISO 19353:2019)
EN ISO 80079-36:2016, Explosive atmospheres — Part 36: Non-electrical equipment for explosive
atmospheres — Basic method and requirements (ISO 80079-36:2016)
EN IEC 61784-3:2021, Industrial communication networks — Profiles — Part 3: Functional safety
fieldbuses — General rules and profile definitions (IEC 61784-3:2021)
EN IEC 62443-2-1:2024, Security for industrial automation and control systems — Part 2-1: Security
program requirements for IACS asset owners (IEC 62443-2-1:2024)
EN IEC 62443-3-2:2020, Security for industrial automation and control systems — Part 3-2: Security risk
assessment for system design (IEC 62443-3-2:2020)
EN IEC 62443-3-3:2019, Industrial communication networks — Network and system security — Part 3-
3: System security requirements and security levels (IEC 62443-3-3:2013 + COR1:2014)
EN IEC 62443-4-1:2018, Security for industrial automation and control systems — Part 4-1: Secure
product development lifecycle requirements (IEC 62443-4-1:2018)
EN IEC 62443-4-2:2019, Security for industrial automation and control systems — Part 4-2: Technical
security requirements for IACS components (IEC 62443-4-2:2019)
EN ISO/IEC 15408-1:2023, Information security, cybersecurity and privacy protection — Evaluation
criteria for IT security — Part 1: Introduction and general model (ISO/IEC 15408-1:2022)

As impacted by EN ISO 80079-36:2016/AC:2019
As impacted by EN IEC 61784-3:2021/A1:2024
As impacted by EN IEC 62443-3-3:2019/AC:2019-10
As impacted by EN IEC 62443-4-2:2019/AC:2022-09
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12100:2010 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
cleaning and pretreatment machinery
automatic or manually operated machinery for cleaning and/or pretreatment of industrial items using
liquids or vapours
3.2
integral transport system
handling system which is integral part of the cleaning and pretreatment machine
4 Safety requirements and/or protective/risk reduction measures
4.1 Materials and products
Cleaning and pretreatment machinery shall by design and construction minimize contact with cleaning
and pretreatment agents during filling, operation, recycling, recovery or draining.
Requirements against hazardous substances are given in 4.14.
Requirements for the information for use are given in Clause 6.
4.2 Lighting
Internal parts requiring frequent inspection and adjustment and maintenance areas shall be illuminated
by at least 500 lx.
If ambient lighting does not provide this illumination intensity, these areas/parts of the machinery shall
be illuminated by integral lighting according to EN 1837:2020.
If installation of machine integral lighting is not reasonable (e.g. due to contamination), information on
the use of mobile lighting shall be given in the information for use.
The requirement for minimum ambient illumination intensity at the place of installation shall be given
in the user information.
4.3 Ergonomics
4.3.1 Operation
Manually operated machine parts (e.g. lids, gates, shutters, handling systems) shall be designed to
— limit the required manual force for operation to a maximum of 25 kg, according to
EN 1005-3:2002+A1:2008;
— limit the required handling range from 1 m to 1,8 m above installation floor level.
Machinery for manual cleaning and pretreatment operation shall provide a working level between
0,75 m and 1,10 m above installation floor level.
4.3.2 Maintenance
To minimize postural constraints:
— openings and accesses for maintenance purposes shall be designed according to
EN 547-1:1996+A1:2008;
— operations to change expendable equipment (e.g. filter elements) shall be taken into account for the
machinery design;
— operations for changing or filling of process liquids shall be taken into account for the machinery
design.
4.3.3 Control devices
Devices provided for control of the cleaning and pretreatment machine (e.g. operating panels) shall be
designed according to EN 61310-1:2008.
4.3.4 Warning devices
Warning devices (e.g. overfilling) shall be designed according to EN 61310-1:2008. Warning devices
shall be equipped with means to check their function. Warning signals shall comply with
EN ISO 7731:2008.
Warning signals shall be perceptible at all workplaces of the machine.
4.4 Operating positions
Operating positions shall be protected against
— hazardous atmosphere (hot vapours or health hazardous vapours) generated in the cleaning or
pretreatment process, by requirements given in 4.14;
— contact with hazardous liquid (hot liquid or health hazardous liquid), e.g. by spilling, splashing or
ejection, by requirements given in 4.14.
Hot surfaces shall be avoided at operating positions by the requirements given in 4.10.
Access to moving parts shall be avoided by requirements given in 4.7.5, 4.7.6 and 4.7.7.
4.5 Protection against corruption
Communication connections related to safety functions shall be assessed and designed according to
EN ISO/IEC 15408-1:2023, EN IEC 62443-2-1:2024, EN IEC 62443-3-2:2020, EN IEC 62443-3-3:2019 ,
EN IEC 62443-4-1:2018 and EN IEC 62443-4-2:2019 .
NOTE The standard prEN 50742:2025 on protection against corruption is under development in IEC TC44.
4.6 Control systems
4.6.1 Safety and reliability of control systems
Safety related control systems shall be designed according to EN ISO 13849-1:2023. This applies also
for input and processing of safety related parameters. Requirements for safety functions are given in
Table 1.
After activation of a safety function, the machinery shall not restart automatically.
Table 1 — Requirements for safety functions
Safety function Clause PLr
Prevention of overfilling of automatically filled tanks 4.7.2.2 PLc
Protection against risks arising from moving parts which cause irreversible 4.7.6 PLd
injuries
Protection against risks arising from moving parts which cause reversible 4.7.6 PLc
injuries
Limitation of the temperature of the flammable process liquid 4.12.2.2 PLd
Maintaining vacuum in the process space 4.12.2.3 PLd
Interlocking the technical ventilation with the supply of flammable liquids 4.12.2.4.2 PLc
and the process operation
4.6.2 Design and construction of control systems
Control systems shall be designed, constructed and assembled according to EN 60204-1:2018 , 4, 6.3, 7,
11.1, 5.4, 7.4, 7.5, 7.6, 7.8, 7.10, 8.4, 9, 10.6, 10.9, 11.2.3.
The safety related part of the control system shall provide a 5 year data history covering interventions
and safety software versions.
4.6.3 Control devices
Control devices shall comply with EN 60204-1:2018 , 9.2.3.1, 9.2.3.2, 9.2.3.6, 9.2.3.10, 10, 11, 16.3.
4.6.4 Starting, stopping, selection of operation modes and prevention of unexpected startup
Starting, stopping, selection of operation modes and prevention of unexpected startup shall comply
with EN 60204-1:2018 , 7.3.1, 7.5, 9.2.2, 9.3.1, 9.2.3.2, 9.2.3.3, 9.2.3.5, 9.2.3.6 9.2.3.8, 9.3.6, 9.2.4.4, 9.3.1,
9.4.
4.6.5 Emergency stop
Emergency stop shall comply with EN 60204-1:2018 , 4.1, 9.2.3.4.1, 9.2.3.4.2, 10.7, 16.3.
4.6.6 Assembly of machinery
An interface for the exchange of safety related information (e.g. stop signal), which allows to maintain
the performance level of the respective safety function, shall be provided for cleaning and pretreatment
machinery which is assembled with other machinery (e.g. conveyor system).
4.6.7 Failure of the power supply or communication network connection
Failure of the power supply or communication network connection shall not lead to any hazardous
situation. The control system shall comply with EN 60204-1:2018 , 5.4, 6.3, 7.5, 9.2.3.3 and
EN IEC 61784-3:2021 .
4.7 Mechanical
4.7.1 Loss of stability
The machinery shall be designed and constructed to maintain its mechanical stability, considering
— mass and volume of the liquid or vapour stored and moved in the machine;
— mass and dynamic forces of sprayed liquid;
— mass and dynamic forces of the integral transport system including the loaded workpieces.
Movable machinery shall be equipped with means to avoid unintentional movement during operation,
by e.g. brakes for wheels or device to retract wheels from the floor.
Hazards related to loss of stability of machinery out of scope (e.g. conveyor systems) can exist.
Requirements against these hazards, shall be identified and implemented when assembling the machine
types involved (e.g. cleaning and pretreatment machinery and conveying system).
4.7.2 Break-up during operation
4.7.2.1 Machinery parts loaded with process liquids
Machinery parts loaded with process liquids shall be designed to withstand
— the forces arising from the
— liquid contained,
— process (e.g. pressure flooding, ultrasonic agitation);
— temperature and temperature variation;
— corrosion, embrittlement and aging caused by the process liquids.
4.7.2.2 Tanks
Overfilling of automatically filled tanks shall be prevented by a
— fill level sensor interlocked with
— filling devices (e.g. pump, valve). The filling of the tank shall be stopped, when the maximum
level is reached,
— the process operation. The operation shall be stopped, when the maximum level is reached;
or
— overflow outlet.
The maximum fill level of a tank shall be indicated by a marking or a signal from a fill level sensor.
4.7.2.3 Parts under pressure
4.7.2.3.1 General
The maximum working pressure of the machinery parts under pressure shall be specified.
If the maximum working pressure can be exceeded,
— pressure limiting devices (e.g. pressure relief valve) shall be installed;
— information on maintenance procedures and cycles of pressure limiting devices, especially when
these are subject to contamination, shall be given in the instruction for maintenance according to
6.2.4.
Uncontrolled ejection of cleaning and pretreatment liquids from the machinery, or ejection of machine
parts (e.g. from leakages or element/part failures) shall be avoided by pressure resistant design and
construction of the elements/parts. Ejected liquids or machine parts shall be contained.
Instructions on operation shall be given according to 6.2.3.
Instructions on inspection and maintenance shall be given according to 6.2.4.
4.7.2.3.2 Pumps
Pumps shall comply with EN 809:1998+A1:2009 .
For air driven pumps the pressure limiting device can be installed on the air supply side.
Instructions on pressure relief procedure shall be given according to 6.2.3 and 6.2.4.
4.7.2.3.3 Pipes, hoses and their assemblies
Pipes, hoses and their assemblies shall be
— designed to withstand external and internal stresses;
— protected against harmful external stress (e.g. mechanical damage by abrasion);
— installed to minimize external stress, (e.g. sufficient radius, length);
— resistant against pressure pulsation.
4.7.3 Falling objects
The integral transport system shall be designed to carry the load of workpieces according to designated
operation.
The movement of the integral transport system shall not cause falling of workpieces.
Hazards related to objects falling from machinery out of scope (e.g. conveyor systems) can exist.
Requirements against these hazards, shall be identified and implemented when assembling the machine
types involved (e.g. cleaning and pretreatment machinery and conveying system).
4.7.4 Surfaces, edges or angles
Accessible edges of metal sheets shall be deburred or fitted with edge protection.
4.7.5 Moving parts
Power-driven turntables, agitation systems, product handling systems, reciprocators, fans, integral
transport systems, rotating spray arms, rotating baskets and other moving parts shall by design and
construction prevent risks of hazardous contact.
Typical measures are:
— limitation of the velocity of the movement;
— two hand operation;
— hold to run operation;
— limitation of the torque.
Where this is not possible, guards or protective devices according to 4.7.6 shall be installed.
Blockage of moving parts shall be prevented by design and construction. If a blockage is likely to occur,
protective devices and tools shall be provided for safe unblocking.
Instructions on safe unblocking shall be given according to 6.2.3.
4.7.6 Protection against risks arising from moving parts
Access to hazardous moving parts (e.g. power-driven turntables, agitation systems, product handling
systems, reciprocators, fans, integral transport systems, rotating spray arms, rotating baskets) shall be
designed and safeguarded in accordance with EN ISO 13857:2019, EN ISO 13854:2019,
EN 809:1998+A1:2009 . This shall be achieved by fitting
— fixed guards
or
— one of the following devices interlocked with the hazardous movement
— movable guards according to EN ISO 14120:2015;
— active opto-electronic protective devices, according to EN IEC 61496-1:2020 and
EN IEC 61496-2:2020;
— pressure sensitive protective devices (mats and floors), according to EN ISO 13856-1:2013.
Fixed guards that may be demounted by the user, e.g. for maintenance and cleaning purposes, shall be
fitted with fixing elements remaining attached to the machine or to the guard when the guard is
removed, e.g. captive screws.
If access for maintenance or other reasons is foreseen to be frequent, i.e. more than once per shift,
interlocked movable guards shall be used. If it is possible to reach moving parts before they have
stopped, the guard shall be interlocked with guard locking according to EN ISO 14119:2025.
Requirements for safety functions are given in 4.6.1, Table 1.
Robots shall be integrated according to EN ISO 10218-2:2025.
Lifting tables shall be designed and constructed according to EN 1570-1:2024.
Hazards related to moving parts of machinery out of scope (e.g. conveyor systems) can exist.
Requirements against these hazards, shall be identified and implemented when assembling the machine
types involved (e.g. cleaning and pretreatment machinery and conveying system).
4.7.7 Uncontrolled movements
Uncontrolled movements of the integral transport system shall be avoided by devices (e.g. brake) to
avoid hazardous movement in case of energy loss.
Information on fixing movable machine parts (e.g. vertical shutter door) in safe position during
maintenance shall be given in the information for use.
4.8 Electricity
4.8.1 General
This clause deals with requirements for electrical safety of humans. Requirements against electrical
ignition hazards are given in 4.12.
The electrical equipment (e.g. digital displays, heating systems, initiators, control systems) shall comply
with EN 60204-1:2018 .
NOTE For use in explosive atmosphere, see further information in EN IEC 60079-0:2018 .
All conductive parts shall be earthed at equal potential.
4.8.2 External
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