ISO 14120:2002 pdf download

ISO 14120:2002 pdf download.Safety of machinery -Guards -General requirements for the design and construction of fixed and movable guards.
5.1.5 Noise
Where a requirement has been established to reduce machine noise, guards shall be designed and constructed to give the required noise reduction whilst providing protection against the other hazards present at the machine (see reference [4]). Guards acting as acoustic enclosures shall have adequately sealed joints to reduce the emission of noise.
5.1.6 Radiation
Where there is a foreseeable risk of exposure to hazardous radiation, guards shall be designed and appropriate materials selected to protect persons from the hazard. Examples include the use of darkened glazing to prevent weldflash or the elimination of openings in a guard around a laser.
5.1.7 Explosion
Where there is foreseeable risk of explosion, guards shall be designed to contain or dissipate the released energy
in a safe manner and direction (for example by use of “explosion relief” panels) (see EN 1127-1).
5.2 Human aspects
5.2.1 General
Reasonably foreseeable aspects of human interaction with machinery (for example when loading, maintaining or
lubricating) shall be given proper consideration in the design and construction of guards.
5.2.2 Safety distances
Guards intended for preventing access to danger zones shall be designed, constructed and positioned to prevent parts of the body from reaching danger zones (see also ISO 13852 and ISO 13854).
5.2.3 Control of access to the danger zone
As far as is practicable, movable guards shall be designed and positioned such that dunng normal operation they are prevented from closing with persons in the danger zone. Where this is not practicable, other means shall be used to prevent persons from remaining undetected within the danger zone.
5.2.4 Viewing
To minimize the need to remove them, guards shall be designed and constructed to offer adequate viewing of the
process.
5.2.5 Ergonomic aspects
Guards shall be designed and constructed taking into account ergonomic principles (see also ISO/TR 12100-2:1992, 3.6.1 and 3.6.2).
5.2.5.1 Size and weight
Removable sections of guards shall be designed to be of a suitable size and weight to permit ease of handling. Guards which cannot readily be moved or transported by hand shall be provided or be capable of being provided with suitable attachment devices for transport by means of a lifting gear.
The attachments or provisions can be, for instance:
standard lifting appliances with slings, hooks, eyebolts or simply tapped holes for appliance fixing; appliances for automatic grabbing with a lifting hook, when securing is not possible from the ground;
lifting gear and appliances integrated into the guard;
an indication, on the guard itself and on some of its removable parts or in the information for use, of the value
of their mass expressed in kilograms (kg).
5.2.5.2 Operating force
Movable guards or removable sections of guards shall be designed to permit ease of operation.
The observance of ergonomic principles in designing guards contributes to increasing safety by reducing stress and the physical effort of the operator. This improves the performance and reliability of the operation, thereby reducing the probability of errors at all stages of machine use (see ISO/TR 12 100-1:1992, 3.11).
Operating forces can be reduced by the use of devices such as springs, counterbalances or gas struts.
Where guards are power operated, they shall not be capable of causing injury (for example from contact pressure, force, speed, sharp edges). Where a guard is fitted with a protective device which automatically initiates re-opening of the guard, the force to prevent the guard closing shall not exceed 150 N. The kinetic energy of the guard shall not exceed 10 J. Where no such protective device is fitted, these values shall be reduced to 75 N and 4 J respectively.
5.2.6 Intended use
Guards shall be designed so far as is practicable to take into account foreseeable use and reasonably foreseeable
misuse (see ISO/TR 121 00-1:1992, 3.12).
5.3 Guard design aspects
5.3.1 General
All foreseeable aspects of guard operation shall be given proper consideration at the design stage to ensure that the
design and construction of the guard itself does not create a further hazard.
5.3.2 Crushing or trapping points
Guards shall be designed so as not to cause hazardous crushing or trapping points with parts of the machine or other guards (see also ISO 13854).
5.3.3 Durability
Guards shall be designed to perform their function properly throughout the foreseeable life of the machine, otherwise
provision shall be made for the replacement of degradable parts.
5.3.4 Hygiene
Where applicable, guards shall be designed so as not to create hazards to hygiene by trapping items or material, for example food particles, stagnant fluids (see EN 1672-2).
5.3.5 Cleaning
Guards used in certain applications, notably for the processing of food and pharmaceuticals, shall be so designed that
they are not only safe to use but can also be easily cleaned.
5.3.6 Exclusion of contaminants
Where it is a requirement of the process, guards shall be designed to exclude contaminants from the process, for example in the food, pharmaceutical, electronic and related industries.