AS NZS 4024.1803:2014 – Safety of machinery Part 1803: Safety distances and safetygaps—Minimum gaps to prevent crushing of parts of the human body.
— two movable parts are moving towards one another, or
— one movable paiL is ir)uviiig tuwdids a fixed part.
NOTE — See also srwcx &
4 Minimum gaps
4.1 Methodology for th. us. of this lnt.rnational Standard
The methoo ot using this International Stanoard Shall form part or me iterative salety strategy ouuineu In ciause ‘Sm’ateqy I oi selecting safety riieaswes” of ISO(R 12100-1.1992.
The user of this International Standard shall:
a) identify the crushing hazards;
b) assess the risks from these hazards in accordance with ISOITR 12100-1, paying particular attention to the tollowing:
— where it is foreseeable that the nsk from a crushing hazard involves different parts of the body, the minimum gap given in table 1 relating to the Largest f these parts shall be applied see also III).
— the unpredictable behaviour of children and their body dimensions if children are included in the population at risk,
— whether parts of the body could enter the crushing zone in a configuration other than those indicated in table I.
— whether thick or bulky clothing (e.g. protective clothing for extreme temperatures) or tools have to he taken into account.
— whether machinery will be used by persons wearing thick-soled footwear (ag. clogs) which will IlL, ease the effective dimension of the foot.
C) select from table 1 the appiupriate minimum gap relating to the body part at iisk (see also iiex AJ. d) if adeguate safety cannot be achieved by the minimum gaps selected from table 1. other or additional
measures and/or means shall be used (see e.g. ISO/TR 12100-1, ISO/TM 12100-2 arid ISO 13852).
If the minimum gap for the largest oxpcctcd body part cannot be achieved, the following example gives one particular means of restricting access to smaller body parts.
FXAMPLE
Access of larger body paits to the ciushang zone can be prevented by the use ol piotect.ve structures having
a restricted opening, as indicated in figure 1.
The possibility of access to a crushing zone for a particular part of the body is dopondant on the following
— the gap a between the fixed and moving part or between two moving parts;
— the depth b of the crushing zone;
— the dimensions s of the opening in the protective structure and its distance d froni the crushing zone. NOTE — The dimensions for openings in relation to sat ely distances can be found in ISO 13962
For certain applications there may he justifiable reasons to deviate from the minimum gaps in table 1. Standards dealing with these applications indicate flow adequate safety can be reached
— two movable ports are moving towards one another, or
— oiw movable pert is moving towards fixed part.
NOTE Lee &so annex &
4 Minimum gaps
4.1 Methodology for the use of this lnt.rnational Standard
The method of using this Internationai Stanaard shar form part of the iterative safety strategy outlined in clause 5 Siiateqy lvi selecting safety measures” of ISOiTR 12100-1.1992.
The user of thi5 International Standard shell:
a) identity the crushing hazards;
b) assess the risks from these hazards in accordance with ISO/TR I 2100-1, paying particular attention to the following:
— where it is foreseeable that the risk from a crushing hazard invo’ves different parts of the body, the minimum gap grven in table 1 relating to the largest of these parts shall be applied Isee also dli.
— the unpredictable behaviour of children and their body dimensions if children are included in the population at risk,
— whether parts of the body could enter the crushing zone in a configuration other than those indicated in table 1,
— whether thick or bulky clothing (e.g. protective clothing for extreme temperatures) or tools have in he taken into account.
— whether machinery will be used by persons wearing thick-soled footwear (e.g. clogs) which will inclease the effective dimension of the foot;
cI select from table 1 the appropriate minimum gap relating to the body part at risk (see also wiriex A), d) if adequate safety cannot be achieved by the minimum gaps selected from table 1. other or additional
measures and/or means shall be used (see e.g. IS0/’rR 12100-1. ISOITR 12100-2 and ISO 13852).
If the minimum gap for the largot oxpccted body part cannot be achieved, the following example gives one particular means of restricting access to smaller body parts.
FXAMPIE
Access of larger body parts to the crushing zone can be prevented by the use ul protective structures having
a restricted opening, as indicated in figure 1.
The possibility of access to a crushing zone for a pamcular part of th. body is dopondant on the following.
— me gap a between the fixed and moving part or between two moving parts;
— the depth b of the crushing zone;
— the dimensions c of the opening in the protective structure and its distance d hour the crushing zone.