EN 12609:2021

SLOVENSKI STANDARD
01-marec-2021
Mešalec za beton (tovornjak) - Varnostne zahteve
Truck mixers - Safety requirements
Fahrmischer - Sicherheitsanforderungen
Bétonnières portées - Prescriptions de sécurité
Ta slovenski standard je istoveten z: EN 12609:2021
ICS:
53.060 Industrijski tovornjaki Industrial trucks
91.220 Gradbena oprema Construction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12609
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 91.220
English Version
Truck mixers - Safety requirements
Bétonnières portées - Prescriptions de sécurité Fahrmischer - Sicherheitsanforderungen
This European Standard was approved by CEN on 13 January 2020.

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 CEN-CENELEC Management Centre 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 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, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12609:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 9
4 Safety requirements and/or protective measures . 11
4.1 General requirements . 11
4.1.1 General . 11
4.1.2 Mechanical hazards . 12
4.1.3 Electrical hazards . 13
4.1.4 Thermal hazards . 13
4.1.5 Noise . 13
4.1.6 Electromagnetic compatibility (EMC) . 13
4.2 Control system . 14
4.2.1 Stop system . 14
4.2.2 Multiple control stations . 14
4.2.3 Cable-less remote control . 15
4.3 Manual control devices for emergency operation . 15
4.4 Positioning of control devices . 15
4.4.1 Control devices at the work station . 15
4.4.2 Other control devices. 15
4.5 Working lights . 15
4.6 Additional removable equipment . 15
4.7 Interface mixer unit and truck or trailer . 15
4.8 Mixer drum . 16
4.8.1 Manhole . 16
4.8.2 Mixer drum-locking device . 16
4.8.3 Mixer drum opening . 16
4.9 Flip-over chute . 17
4.10 Swivel chute . 17
4.11 Mixer drum closure system . 17
4.12 Power transmission from the power source to the mixer drum drive system . 17
4.13 Water system . 17
4.14 Exhaust system of the auxiliary engine . 17
4.15 Platform at the charging hopper . 18
4.16 Tread at rear underrun protective device . 18
4.17 Visual aid . 18
5 Verification of safety requirements and/or protective measures . 19
6 Information for use . 20
6.1 General . 20
6.2 Instruction handbook . 20
6.2.1 General . 20
6.2.2 Noise . 21
6.2.3 Operation . 22
6.2.4 Maintenance and repair . 23
6.3 Information and warnings . 24
6.3.1 Labelling for the control device . 24
6.3.2 Warnings . 24
6.4 Marking . 24
Annex A (informative) Figures . 25
A.1 Typical design . 26
A.2 Types of drive, diagrams . 27
A.3 Dimensions for access ladder to platform . 28
A.4 Minimum clearance 'a' depending on distance 'W' to the reference plane, according
to Table 1 . 29
A.5 Cross-sections (view from cabin side) of the truck mixer to indicate the positions of
the manhole when the mixer drum is locked by the mixer drum-locking device. 29
A.6 Fixed guard at mixer drum opening . 30
A.7 Minimum clearance between mixer drum roller cover and mixer drum track ring . 31
A.8 Minimum clearance between mixer drum and supporting arm . 32
A.9 Minimum clearance between mixer drum and charging hopper bracket . 33
A.10 Minimum clearance between mixer drum and discharge hopper . 34
A.11 Minimum clearance between mixer drum and guard rail at platform . 35
A.12 Minimum distance between mixer drum closure system and discharge hopper . 36
A.13 Minimum clearance between mixer drum and additional equipment . 37
A.14 Minimum clearance between mixer drum and rear splash guard . 39
A.15 Minimum dimensions of the visibility test rectangle (VTR) . 39
A.16 Example of flip-over chute. 40
A.17 Example of technical solution for enforced two-hand operation to bring the flip-over
chute to its lowered end position . 41
Annex B (normative) Noise-test code for truck mixers . 42
B.1 Scope . 42
B.2 Determination of the A-weighted sound-power level . 42
B.2.1 General . 42
B.2.2 Measurement surface and microphone positions . 43
B.2.3 Period of observation . 43
B.3 Determination of the A-weighted emission sound pressure level at the work station . 43
B.3.1 General . 43
B.3.2 Machine work station . 43
B.3.3 Period of observation . 43
B.4 Measurement procedure and operating conditions . 44
B.4.1 Specific measurement procedure for truck mixers powered by a truck engine . 44
B.4.2 Measurement procedure for mixer units not powered by a truck engine . 44
B.4.3 Operating conditions during test . 44
B.4.4 Fan speed . 44
B.5 Information to be recorded during the test. 44
B.6 Information to be reported . 44
B.7 Declaration and verification of noise emission values . 45
Annex C (informative) Example of a noise emission declaration . 46
Annex D (informative) List of significant hazards . 47
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 2006/42/EC aimed to be covered . 50
Bibliography . 53

European foreword
This document (EN 12609:2021) has been prepared by Technical Committee CEN/TC 151 “Construction
equipment and building material machines - Safety”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by July 2021, and conflicting national standards shall be
withdrawn at the latest by July 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request 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.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Turkey and the United
Kingdom.
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:
a) machine manufacturers (small, medium and large enterprises);
b) 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:
a) machine users/employers (small, medium and large enterprises);
b) machine users/employees (e.g. trade unions, organizations for people with special needs);
c) service providers, e.g. for maintenance (small, medium and large enterprises);
d) consumers (in case of machinery intended for use by consumers).
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
1.1 This document specifies the safety requirements for truck mixers.
This document also covers the interface between the mixing unit and the truck or trailer (but not the
truck or trailer itself).
NOTE 1 Truck or trailer constructed primarily for the carriage of goods as classified according to directive
2007/46/EC, category N3 or O4.
This document does not cover:
a) additional equipment (conveyor belt, mortar pump, concrete pump, concrete-placing boom);
b) requirements for operation in tunnels;
c) truck or self-propelled mixers equipped with self-loading systems;
d) front-discharge mixers;
e) mixing units with articulated steering;
f) truck mixer drum cleaning systems;
g) energy source(s).
This document does not deal with carrier vehicles, e.g. trucks, tractors, construction machinery and
mobile industrial handling equipment or other self-propelled vehicles.
This document does not include requirements which are covered in directives related to the construction
of vehicles or national road regulations.
NOTE 2 The use in public road traffic is governed by the national regulations.
1.2 This document deals with all significant hazards, hazardous situations and events relevant to truck
mixers when they are used as intended and under the conditions of misuse which are reasonably
foreseeable by the manufacturer (see Annex D). This document specifies the appropriate technical
measures to eliminate or reduce risks arising from the significant hazards during transportation,
assembly, dismantling, disabling, scrapping, operation and maintenance of the truck mixer.
1.3 This document is not applicable to machines which are manufactured before the date of publication
of this document by CEN.
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 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General
requirements (IEC 60204-1:2005)
EN 61000-6-2:2005, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity
standard for industrial environments (IEC 61000-6-2:2005)
EN 61000-6-2:2005/AC:2005, Electromagnetic compatibility (EMC) — Part 6-2: Generic Standards —
Immunity standard for industrial environments (IEC 61000-6-2:2005)
EN ISO 2867:2011, Earth-moving machinery — Access systems (ISO 2867:2011)
EN ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise
sources using sound pressure — Engineering methods for an essentially free field over a reflecting plane
(ISO 3744:2010)
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 4871:2009, Acoustics — Declaration and verification of noise emission values of machinery and
equipment (ISO 4871:1996)
EN ISO 11201:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions in an essentially free field over a
reflecting plane with negligible environmental corrections (ISO 11201:2010)
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 13766-1:2018, Earth-moving and building construction machinery — Electromagnetic
compatibility (EMC) of machines with internal electrical power supply — Part 1: General EMC requirements
under typical electromagnetic environmental conditions (ISO 13766-1:2018)
EN ISO 13766-2:2018, Earth-moving and building construction machinery — Electromagnetic
compatibility (EMC) of machines with internal electrical power supply — Part 2: Additional EMC
requirements for functional safety (ISO 13766-2:2018)
EN ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design (ISO 13849-1:2015)
EN ISO 13850:2015, Safety of machinery — Emergency stop function — Principles for design
(ISO 13850:2015)
EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by
upper and lower limbs (ISO 13857:2008)
EN ISO 14120:2015, Safety of machinery — Guards — General requirements for the design and
construction of fixed and movable guards (ISO 14120:2015)
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the terms and definitions given in EN ISO 12100:2010 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
mixing unit
assembly of components including rotary drum-type mixer designed for charging, mixing, temporary
storage and discharging of concrete, mortars and mineral building materials with a maximum specific
weight of 2 500 kg/m
Note 1 to entry: The main components of the mixing unit are defined in 3.3.
3.2
truck mixer
mixing unit mounted on a commercial truck or trailer
3.3
mixing unit components
3.3.1
basic frame
structure connecting the front and the rear support of the mixer drum
3.3.2
mixer drum
main element of the mixer, rotating during operation, that contains fins, for mixing charging and
discharging
3.3.3
mixer drum opening
opening for charging and discharging the mixer drum
3.3.4
front support
structure supporting the mixer drum at its closed side (front side)
3.3.5
rear support
structure supporting the mixer drum at the side of the mixer drum opening
Note 1 to entry: The charging hopper and discharge components are located at the rear support.
3.3.6
charging hopper
structure to charge the mixer drum
3.3.7
discharge components
components to direct and distribute the material being discharged from the mixer drum, e.g. discharge
hopper, swivel chute, flip-over chute; extension chute (see Figure A.1)
3.3.8
mixer drum drive
energy transmission for the rotation of the mixer drum, excluding the energy source(s), e.g. truck engine,
auxiliary engine, batteries
3.3.9
water system
installation for adding water and for cleaning, e.g. consisting of a water tank, distribution line system,
valves, and a water meter
Note 1 to entry: The water system is optional and usually powered pneumatically or pressurized by a water
pump.
3.3.10
control station
unit with control devices for operating the functions of the truck mixer (e.g. rotation direction of mixer
drum, rotating speed, stop function of the mixer drum)
Note 1 to entry: The control station can be a remote-control station with cable or cable-less.
3.3.11
work station
place where the main control station of the mixer drum drive is arranged, normally at the rear of the
truck mixer
Note 1 to entry: The work station is for operating the charging, mixing and discharging. The operator is either
standing on ground level (see Figure A.1) or on the tread at the rear underrun protective device. Additional control
stations can be provided, e.g. in the cabin of the truck.
3.3.12
platform
elevated stand at the charging hopper of the truck mixer for cleaning and inspection (see Figure A.1)
3.3.13
mixer drum closure system
device to cover the mixer drum opening partly or completely to prevent spilling of concrete, mortars or
mineral building materials
Note 1 to entry: The mixer drum closure system is optional.
3.3.14
supporting arms
superstructure for carrying the charging hopper and discharge components and the platform (see
Figure A.1)
3.3.15
rear splash guard
device below the mixer drum preventing the mixer drum from getting dirty (see Figure A.1)
3.4
rated capacity of the truck mixer
maximum volume of concrete, mortars and mineral building materials the truck mixer is designed for,
with a maximum specific weight of 2 500 kg/m
3.5
interface
all connections that allow the transfer of physical forces, energies, commands and/or information (e.g.
mechanical, hydraulic, pneumatic, electrical, electronical) between the mixing unit and the truck or trailer
on which it is mounted
3.6
operator
person authorised and trained to operate a truck mixer
Note 1 to entry: In general, the mixer operator is also the driver of the truck mixer.
3.7
normal operation
operation of the machine with all systems in function
3.8
emergency operation
operation of the machine with a system failure
Note 1 to entry: An example for an emergency operation: In case of energy source(s) or control system failure, a
separate hydraulic power pack is connected, and the mixing unit is operated by manual valve actuation under
circumvention of the emergency-stop system.
3.9
visual aid
system that provides visual information without warning
Note 1 to entry: The system generally includes a monitor and camera.
3.10
visibility test rectangle (VTR)
rectangle located on the plane ground as reference, aligned symmetrically to the longitudinal axis of the
truck mixer in order to test the visual aid (see Figure A.15)
3.11
truck mixer drum cleaning system
separate machine to remove residual concrete from the inside of the mixer drum
4 Safety requirements and/or protective measures
4.1 General requirements
4.1.1 General
Machinery shall comply with the safety requirements and/or protective measures of this clause.
In addition, the machine shall be designed according to the principles of EN ISO 12100:2010 for hazards
that are relevant, but not significant, and which are not dealt with by this document (e.g. sharp edges).
4.1.2 Mechanical hazards
4.1.2.1 Risk of slipping
The surface of means of access, e.g. platform, has to be slip-resistant according to EN ISO 2867:2011.
4.1.2.2 Risk of entanglement, crushing, shearing
To protect the operator from the risk of entanglement, crushing and shearing, fixed guards shall be
provided in accordance with EN ISO 14120:2015 and EN ISO 13857:2008. Due to functional restrictions,
the following exceptions to EN ISO 13857:2008, Table 3 and Table 4, will be applied.
For the empty truck mixer standing on level ground, the following minimum clearances between the
mixer drum and non-moving parts are defined, with the hazard zone situated at a distance W (see Table 1
below) from an imaginary vertical plane parallel to the longitudinal axis of the vehicle intersecting the
most outer point of the vehicle (reference plane):
Table 1 — Minimum clearance 'a' depending on the distance 'W' to the reference plane (see
Figure A.4)
W Minimum clearance, a
≥ 800 mm ≥ 20 mm
< 800 mm ≥ 50 mm
Besides the general minimum clearances of Table 1, further exceptions are defined in Table 2.
Table 2 — Clearances for specific entanglement points
Entanglement points Clearance
mixer drum roller cover -
1 max. 10 mm (Figure A.7)
mixer drum track ring
mixer drum - supporting
2 min. 20 mm (Figure A.8)
arm
mixer drum - charging
3 min. 20 mm (Figure A.9)
hopper bracket
mixer drum - discharge
4 min. 20 mm (Figure A.10)
hopper
mixer drum - guard rail at
5 min. 50 mm (Figure A.11)
platform
mixer drum closure system
6 min. 20 mm (Figure A.12)
- discharge hopper
mixer drum - additional min. 20 mm (Figure A.13 a), A.13 b)
equipment and A.13 c))
mixer drum - rear splash
8 min. 20 mm (Figure A.14)
guard
The hazard zones shall be indicated by decals and the residual risk shall be described (see 6.3.2).
4.1.2.3 Risk of impact, risk of injection
The hydraulic system shall be designed in accordance with EN ISO 4413:2010.
The pneumatic system shall be designed in accordance with EN ISO 4414:2010.
NOTE The hydraulic system and the pneumatic system of the truck or trailer are not covered.
The interface specified by the truck or trailer manufacturer shall be applied.
4.1.3 Electrical hazards
Electrical installations shall comply with EN 60204-1:2006.
The interface specified by the truck or trailer manufacturer shall be applied.
4.1.4 Thermal hazards
Thermal guarding shall be provided to prevent contact with metallic surfaces (painted or coated) that
reach temperatures > 75 °C under normal operating conditions and which are within reach from the
work station.
4.1.5 Noise
4.1.5.1 Noise reduction at the design stage
Machinery shall be designed and constructed in such a way that risks resulting from the emission of
airborne noise are reduced to the lowest level, taking account of technical progress and the availability
of means of reducing noise, in particular at source.
When designing machinery, the available information and the technical measures to reduce noise at the
source given in EN ISO 11688-1:2009 shall be taken into account.
NOTE EN ISO 11688-2:2000 gives useful information on noise-generation mechanisms in machinery.
Main noise sources are the power source(s), mixer drum drive and the mixer drum with its content. The
power source on the truck is the main source of noise.
In case the truck is purchased by the truck mixer manufacturer, the truck mixer manufacturer is
recommended to ask for a low-noise truck.
Noise reduction is possible e.g. with the choice of low-noise hydraulic components, gears, auxiliary engine
if any, reduction of vibration transmitted from drive to other parts of construction and design of the
construction that prevents the arising of resonance.
NOTE See also Annex B.
4.1.5.2 Information on noise emission
Information on noise emission shall be given in the information for use (see 6.2.2).
4.1.6 Electromagnetic compatibility (EMC)
Truck mixers with combustion engine shall comply with the requirements of electromagnetic
compatibility as specified in EN ISO 13766-1:2018 and EN ISO 13766-2:2018).
Electric grid-connected truck mixers shall comply with EN 61000-6-2:2005 and
EN 61000-6-2:2005/AC:2005.
Any other drive design or combination of drive designs shall comply with the applicable standards.
4.2 Control system
4.2.1 Stop system
4.2.1.1 Normal stop
A normal stop device shall be provided to bring the machine to a complete stop. In case of a combustion
engine, the ignition lock (key- and keyless-systems) shall be considered as normal stop device. In case of
an electric drive, an additional supply disconnecting device according to EN 60204-1:2006, 5.3 and
9.2.5.3, shall be provided. Stop category 0 according to EN 60204-1:2006, 9.2.2, shall be fulfilled.
4.2.1.2 Emergency stop
The emergency stop shall comply with EN ISO 13850:2015 and shall stop all power-driven machine
functions.
NOTE According to the state of the art, the energy source(s), e.g. the engine of the truck, auxiliary motor, can
stay in operation.
Stop category 0 according to EN 60204-1:2006, 9.2.2, shall be fulfilled. The machine shall have an
emergency stop at each control station (see also 4.2.3).
The emergency-stop system shall fulfil Performance Level c according to EN ISO 13849-1:2015.
4.2.1.3 Starting of the machinery
An intended control device for starting the operation of the machinery shall be provided.
4.2.1.4 Restarting of the machinery
When restarting the machinery after a stoppage, an unexpected start-up of hazardous functions of the
machine shall be prevented. To prevent the unexpected start-up of the truck mixer, the safety-related
part of the control system shall fulfil Performance Level c according to EN ISO 13849-1:2015.
4.2.1.5 Devices for switching off for prevention of unexpected start-up
Means to isolate machinery from energy sources shall be provided and shall be capable to be locked. For
a truck mixer, the ignition key of the truck or the ignition key of the auxiliary engine are considered to
fulfil the requirement.
4.2.2 Multiple control stations
If there is more than one control station at the machine, the respective function shall only be possible
from one control station at the same time according to EN 60204-1:2006, 9.2.7.4 - Use of more than one
operator control station.
The safety-related part of the control system shall be in accordance with EN ISO 13849-1:2015,
Performance Level c.
NOTE A mechanical control system where multiple levers are connected to activate the same function at the
same time does not fulfil the requirements of 4.2.2.
4.2.3 Cable-less remote control
A cable-less remote control is considered a control station. All requirements for control systems equally
apply for cable-less remote controls, except for the emergency stop.
A cable-less remote control shall be equipped with a stop function according to EN 60204-1:2006, 9.2.7.3.
The safety-related part of the stop system shall fulfil Performance Level c according to
EN ISO 13849-1:2015. In case of the presence of a cable-less remote control, the machine shall be
equipped with at least one emergency stop at the rear (see 4.2.1.2).
4.3 Manual control devices for emergency operation
Manual control devices for emergency operation, e.g. to discharge the drum, shall be protected against
unintended use, e.g. by a fixed guard, distance guard, the structure of the machinery acting as a guard.
The use of these manual control devices shall be described, see 6.2.3.1 b).
4.4 Positioning of control devices
4.4.1 Control devices at the work station
The control devices at the work station at the rear of the truck mixer shall be positioned in a distance
from the ground between 800 mm and 1 800 mm.
4.4.2 Other control devices
Handling positions of other control devices and equipment used on the construction site shall be
positioned in a maximum height from the ground or from the tread on the rear underrun protective
device according to Table 3.
Table 3 — Maximum height of other control devices
Frame height Maximum height of other control devices
Up to 1 000 mm 1 800 mm
Higher than 1 000 mm up to 1 100 mm 1 900 mm
Higher than 1 100 mm 2 000 mm
4.5 Working lights
For the illumination of the work station, at least one working light shall be provided with a minimum light
power of 800 lumens.
4.6 Additional removable equipment
Additional, removable equipment (e.g. extension chutes) and tools to be handled manually by the
operator shall have a maximum mass of 25 kg each. Means shall be provided for the operator to fix such
equipment and to secure it against unintended movement.
4.7 Interface mixer unit and truck or trailer
The interface between the mixing unit and the truck or trailer shall be designed and constructed in
accordance with the specifications defined by the truck or trailer manufacturer.
4.8 Mixer drum
4.8.1 Manhole
At least one manhole shall be provided. The size of a manhole shall have a minimum clear diameter of
500 mm. The mass of a manhole cover shall not exceed 25 kg (see EN ISO 2867:2011, 5.11).
4.8.2 Mixer drum-locking device
To prevent unintended rotation of the mixer drum, the truck mixer shall be equipped with a mixer drum-
locking device.
It shall fulfil the following requirements:
a) it shall withstand a turning moment of the mixer drum of 25 000 Nm or a force which is created from
1,0 m of cured concrete within the mixer drum;
b) it shall be permanently mechanically connected/linked to the machine near the locking point;
c) if intended to be handled manually (hand-held) by the operator, the weight of each single piece of
the mixer drum-locking device shall not exceed 10 kg;
d) it shall be designed to work throughout the whole lifetime of the truck mixer;
e) if a friction-based locking device is provided, it shall be designed taking into consideration that the
machine might be exposed to friction-reducing agents.
For ergonomic positioning during works inside the mixer drum, a minimum of two locking positions shall
be provided to avoid overhead works (e.g. removal of hardened concrete or replacement of mixer drum
fins).
When the mixer drum is locked by the mixer drum-locking device, the manhole shall be located at an
angle of approximately 60° compared to the vertical plane (see Figure A.5) so that the mixer drum can be
entered from the left and the right side of the truck.
4.8.3 Mixer drum opening
4.8.3.1 Fixed guard at mixer drum opening
Access to the shearing points:
a) rear end of mixer drum to discharge hopper;
b) rear end of mixer drum to charging hopper
shall be prevented by a fixed guard.
This fixed guard shall secure the area between the charging hopper, the mixer drum and the discharge
hopper on the side of the platform up to the vertical plane through the middle axis of the mixer drum.
In addition, this fixed guard shall be shaped and located in a way that the distance between the rear end
of this fixed guard and the rear end of the mixer drum is greater than 350 mm. The distance from the rear
end of the mixer drum to the front end of this fixed guard shall be at least 120 mm (see also Figure A.6).
This fixed guard shall be in accordance with EN ISO 14120:2015. The dimension of the openings of this
fixed guard shall be in accordance with EN ISO 13857:2008, Table 4. As an exception, for cleaning
purposes, “e” shall be a value of ≤ 60 mm with at the same time a distance of s ≥ 120 mm to the hazard
r
zone (rear end of mixer drum), see also Figure A.6.
A warning sign indicating the remaining risks of crushing/shearing shall be applied close to or on this
fixed guard (see 6.3.2).
4.8.3.2 Use of truck mixer drum cleaning system
For truck mixers without mixer drum closure systems, the rear parts of the machine (including the
charging hopper) and, where relevant, the surrounding structure shall be designed to be lifted or
removed in order to allow access for a truck mixer drum cleaning system.
4.9 Flip-over chute
The flip-over chute is operated manually. Therefore, it shall be equipped with at least one handle to flip
over the chute (see Figure A.16).
The flip-over chute shall be designed in a way that two-hand operation is enforced before reaching the
lowered end-position in order to reduce the risk of crushing (see Figure A.17).
4.10 Swivel chute
Swivel chutes can be operated manually or power-driven. In case of power-driven swivel chutes, the
safety-related part of the control system shall be operated with hold-to-run devices which shall fulfil
Performance Level c according to EN ISO 13849-1:2015.
Appropriate means to fix the swivel chute in a travel position shall be provided.
4.11 Mixer drum closure system
For power-driven mixer drum closure systems, the crushing/shearing point shall be either protected by
distance according to 4.1.2.2, or the control device shall be hold-to-run and the safety-related parts of the
control system shall fulfil Performance Level c according to EN ISO 13849-1:2015.
4.12 Power transmission from the power source to the mixer drum drive system
Entanglement points of power-driven parts shall be covered by fixed guards in accordance with
EN ISO 14120:2015. For the transmission shaft between the truck engine and the hydraulic pump, this
requirement applies to the top and both sides of the shaft.
4.13 Water system
If the truck mixer is equipped with a water system, cleaning equipment (e.g. hose, nozzle) shall be
provided at the work station and at the platform.
4.14 Exhaust system of the auxiliary engine
Exhaust-gas outlets shall be arranged in such a way that during operation the gases are not directed to
the work station area.
4.15 Platform at the charging hopper
A platform to be accessed via a ladder, in vicinity to the charging hopper shall be provided, complying
with the requirements of EN ISO 2867:2011.
Further, the following requirements shall apply:
a) the minimum dimensions of the platform shall be 400 mm × 600 mm;
b) the ladder beams shall be considered as handrails;
c) the max
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