ISO 13853 pdf download.Safety of machinery — Safety distances to prevent danger zones being reached by the lower limbs
1 Scope
This International Standard establishes values for safety distances to prevent access and distances to impede free access to machinery danger zones to prevent their being reached by the lower limbs of persons of 1 4 years of age and above. NOTE 1 The values given are based on practical experience which has been found to be adequate for this group of persons. These distances apply when adequate safety can be achieved by distance alone, and when access by the upper limbs is not foreseeable according to the risk assessment. NOTE 2 These safety distances will not provide sufficient protection against certain hazards, for example radiation and emission of substances. For such hazards, additional or other measures need to be taken. The safety distances to prevent access relate to openings, and serve to protect those persons trying to reach danger zones under the conditions specified for different reaching situations. The distances to impede free access relate to the height from ground level to the protective structure, and serve to reduce risk to persons by limiting the free movement of the lower limbs. NOTE 3 If persons below 1 4 years of age are to be taken into account, it is not relevant to establish values other than those for upper limbs. In this case the safety distances to prevent danger zones being reached by the upper limbs, derived from table 5 of ISO 1 3852:1 996, will apply. For certain applications, there are justifiable reasons to deviate from these distances. Standards dealing with these applications should indicate how adequate safety can be achieved.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO/TR 12100-1:1992, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic terminology, methodology. ISO 13852:1996, Safety of machinery — Safety distances to prevent danger zones being reached by the upper limbs. ISO 14121:— 1 ) , Safety of machinery — Principles for risk assessment.
4 Safety distances to prevent access by lower limbs
4.1 General 4.1.1 Assumptions The safety distances have been derived by making the following assumptions: the protective structures and any openings in them retain their shape and position; otherwise further consideration shall be given to achieve adequate safety; safety distances are measured from the surface restricting the body or the relevant part of the body. 4.1.2 Risk assessment A risk assessment (see ISO/TR 12100-1 and ISO 14121) shall be made before determination of the required safety distance for preventing reaching danger zones. This International Standard shall be used if the risk assessment justifies that there is a risk only to the lower limbs. Where there is a risk to both upper and lower limbs, then for a given opening the largest safety distance given in table 1 of this International Standard or in table 4 of ISO 13852:1996 shall be used. The minimum safety distances s r given in table 1 apply to persons reaching through openings using the lower limbs in an attempt to reach a danger zone. 4.2 Reaching through openings using the lower limbs 4.2.1 Openings of regular shape The dimension e of openings corresponds to the side of a square opening, the diameter of a round opening or the narrowest dimension of a slot opening. Slot openings with e > 180 mm and square or round openings with e > 240 mm will allow access for the whole body. The values given in table 1 are independent of whether clothing or footwear is being worn.