Harmonised European Standards
Risk Assessment, Functional Safety and Emergency Stop
Today’s standard dates back to December 2008. Time to renew it? Yes! In 2020 a new edition of the standard will be published by CEN and it will be available at local stores of European Standards Bodies like BSI in UK, AFNOR in France or UNI in Italy.
The team that developed the new standard is the CEN/TC 322 Working Group 1, where GT Engineering is a member. The group worked for ten years on the new text, with few years interruption, though, due to various reasons.
The standards of the UNI EN 746 series contain the requirements for the safe design and construction of industrial thermoprocessing equipment. The full list of these standards is given below:
Part 1: Common safety requirements for industrial thermoprocessing equipment;
Part 2: Safety requirements for combustion and fuel handling systems;
Part 3: Safety requirements for the generation and use of atmosphere gases;
Part 4: Particular safety requirements for hot dip galvanising thermoprocessing equipment;
Part 5: Particular safety requirements for salt bath thermoprocessing equipment;
EN ISO 10218-2
The Standard EN ISO 10218-2 was published in July 2011 by Technical Committee ISO/TC 184 in collaboration with Technical Committee CEN/TC 310.
This is a technical standard of type C, regarding robots and robotic devices.
The scope of the Standard is to specify the safety requirements for the integration of industrial robots and industrial robot system. The integration includes:
- The design, manufacturing, installation, operation, maintenance and decommissioning of the industrial robot system or cell;
- Necessary information for the design, manufacturing, instllation, operation, mai
EN ISO 11161
The Standard EN ISO 11161 was published in May 2007 by the Technical CommiTtee ISO/TC 199 in substitution of the first version 1994 and it is currently under revision.
This is a standard of type B1 regarding a specific safety aspect: the safety of the integrated machinery system (IMS).
NOTE: at the moment the acronim IMS stands for Integrated Manufacturing System; The new edition of the standard will use the term Integrated Machinery System.
The Standard specifies the safety requirements for the integration of machinery into a system. It gives recommendations and requirements fot inherentl
EN ISO 12100
The main topic of EN 12100, which went into effect on November 2010, is Machinery Safety. With this expression, the Norm defines as follow:
The ability of a machine to perform its intended function(s) during its life cycle where risk has been adequately reduced.
So, the Risk Reduction, is the aim of the norm, which provide guidelines about how to obtain a safe machine or equipment. The process conducted for this purpose is called Risk Assessment.
There are so two stages to carry out:
The Risk Assessment itself is composed by several operations:
EN ISO 13855
The EN ISO 13855:2010 Standard, published in May 2010, replaces the European Standard EN 999:1998+A1: 2008.
This is a technical standard type-B regarding the positioning of safeguards with respect to the approach speeds of parts of human body.
Safeguards considered on this Standards include:
- Electro-sensitive protective equipment (Light curtains and Laser scanner)
- Pressure-sensitive protective equipment (Pressure-sensitive mats)
- Two-hand control devices
- Interlocking guards without guard locking
The Standard specifies minimum distances from the hazards caused by the m
EN ISO 14119
The EN ISO 14119 standard, published in October 2013, replaces the European standard EN 1088:1995+A2 (July 2008 edition).
This is a technical standard of type B2 regarding a particular protective system against hazard: interlocking devices.
Its purpose is to specify the principles for design and selection of interlocking device and to provide measures to minimize defeat and bypass of the device.
The Standard also provides:
Requirements for the design and the installation of interlocking devices with and without guard locking;
Additional requirements on guard locking devices if its appli
EN ISO 14120
The EN ISO 14120 Standard, published in October 2015, replaces the European standard EN 953:1997+A1:2009.
This is a technical standard of type-B regarding guards.
Its purpose is to specify the general principles for design, construction and selection of guards provided to protect people from mechanical hazards.
Guards determine a risk reduction both thanks to the protection against unexpected accesses and against the ejection of parts of substances. Guards could also provide protection against other hazards such as noise, fire and radiation.
The Standard applies to guards for machinery.
Keeping a machine in a stopped condition while persons are present in danger zones is one of the most important conditions of the safe use of machinery and hence, one of the major aims of the machine designer and machine user.
In the past, the concepts of “operating machine” and “stopped machine” were generally unambiguous; a machine was
operating when its movable elements or some of them were moving;
stopped when its movable elements were at rest.
Machine automation has made the relationship between “operating” and “moving” on one hand and “stopped” and “at rest” on the other hand, more
ISO/TR 24119 is a Technical Report published for the first time in November 2015 with the title "Safety of machinery — Evaluation of fault masking serial connection of interlocking devices associated with guards with potential free contacts".
Before this document was issued, it wasn't clear how many interlocks could be wired to one safety channel and how much was the Diagnostic Coverage of the Safety Subsystem (Input + Logic). When connecting several interlock to one safety channel a fault may be masked: the problem is therefore called Fault Masking.
This Technical Report explains what t
EN ISO 13850
The Machinery Directive 2006/42/CE, about the safety stop function, states that:
Machinery must be fitted with one or more emergency stop devices to enable actual or
impending danger to be averted.
The purpose of the Emergency Stop Function is to to stop the hazardous functions of machinery as quickly as possible, without creating any further risks. It is not always required the presence of an emergency stop device on a machine, in particular when:
Machinery in which an emergency stop device would not lessen the risk, either because it would not reduce the stopping time or because it wo
EN ISO 14122-3, published at European level in June 2016 and adopted at Italian level in October 2016, replaces the previous EN ISO 14122-3:2010 standard and regulates machinery produced after its publication date. This standard provides the technical specifications to be followed in the construction of stairs, step ladders and ladders used as a means of permanent access to a machine; the specifications provided cannot be applied to motorized access systems, such as escalators and elevators.
For each means of access listed, the design and choice of materials must consider the conditions of use
The Standard EN ISO 14122-4 was published in Italy on October 2016, replaces the previous EN ISO 14122-4 of 2010 and is not applicable to machinery manufactured before the date of its publication.
This part of ISO 14122 gives requirements for fixed ladders which are a part of a stationary machine, and to the non-powered adjustable parts (e.g. foldable, slidable) and movable parts of fixed ladder systems..
The new standard, thanks to the use of images, allows to have a clearer idea of what are the requirements to be observed.
EN ISO 3740
The standard EN ISO 3740, published in march 2019, replaces the previous version EN ISO 3740:2002.
This standard gives the guidelinees for the use and selection of a set of international standards regarding differen methods for determining sound power levels from all type of machinery, equipment and products.
The guidelinees described in this standard are applied to airborne sound.
The standards taken into consideration from EN ISO 3740 are:
ISO/TS 7849-1,-2: “Determination of airborne sound power levels emitted by machinery using vibrations measurements”
ISO 3741: “Dete
EN ISO 13857
The EN ISO 13857 standard, which was published in March 2008, replaces the previous EN 294: 1993 and EN 811: 1998 standards and it is currently under revision in its DIS version (Draft Internation Standard).
This is a standard of type B1 regarding a specific safety aspect: the safety distances.
Its purpose is to provide the safety requirements that the protective structures must have in order to prevent the achievement and contact of Hazard Zones in both industrial and non-industrial environments, for this reason also the situations of possible contacts for 3-years-old children are considere
UNI EN ISO 13849-1
The topic of EN 13849-1, introduced on October 2006, is the reliability of safety systems, replacing the previous EN 954-1. The field of application of EN 13849-1 is the Safety Related Parts of Control System (SRP/CS), defined by the norm as:
Part of a control system that responds to safety-related input signals and generates safety-related output signals.
In other words, it is the set of control components with safety function, having the following tasks:
Identify hazardous situations (input/sensors)
Elaborate a proper response (logic)
Execute the elaborated response (output/actuator
In September 2019 the EN ISO 13854 was published. It replaces the previous standard EN 349:2008.
This standard is part of the approach, in place since several years now in the Machinery Directive, to discuss new standards only at International level (ISO or IEC) and, once approved, adopt them at European level.
The standard falls in the B1 category that is the group of standards which deals with a specific aspect of security: in this case, the security aspect dealt is the minimum gaps to avoid crushing of parts of the human body.
Zone in which the human body or parts of t
EN ISO 20607
The standard EN ISO 20607 has been published in july 2019.
This standard is part of the approach, already applied for some years by the Machinery Directive, which consist in discussing new standards only at international level (ISO or IEC) and, only after their approval, adopting them at European level.
The standard falls into category B1, group of standards that deals with a specific aspect of safety: in this case, the safety aspect dealt with is the preparation of the Instructions Handbook of a machine.
part of the information for use provided by a machine manufactu