Due to the importance of the matter and its span of impact, this document aims at supporting the application of a NWIP as international standard (harmonized ISO/CEN)
The NWIP, named Ergonomic Work Allowance (EWA), wants to be a reference for the process of setting the proper ergonomic allowances to keep the biomechanical load generated by human cyclical work under control. The control limits used by the EWA are the limits defined in the ISO 11228 and 11226.
The EWA is a percentage applied on an underlying quantity, which is the result of a measure of work (see Figure 1 – Standard Time Setting Process). For this reason, the present NWIP will also refer to some key concepts, which are typical industrial engineering topics, considering them as an input and not included within the scope of this proposal.
In the EWA calculation process, we will recommend the most suitable techniques to maximize the accuracy and the efficiency of the required measures. However, given the references set by this NWIP, we leave the freedom to adopt and apply any work measurement technique available on the market.
As far as the biomechanical load measurement is concerned, this NWIP adopts the Ergonomic Assessment Work-Sheet (EAWS), which compounds several risk areas (postures, forces, manual handling of loads and high frequency motions of the upper limbs) on a single measurement scale and which considers the work organization as an influencing factor (shift duration, number of breaks and type of work process).
By ergonomic allowance we mean a percentage used to increase a planned execution time of a given manual task in order to reduce the biomechanical load (fatigue) generated by awkward postures, forces and movements. In the ergonomic allowance we do not include the physiological need allowance, which is a constant value, independent by the type of work (physiological need allowance typically ranges from 4% to 5%), used to allow 2 breaks of about 10 minutes each, distributed within the shift. The ergonomic and physical allowances belong to the personal allowance class.
Other existing allowance classes, work allowance and learning allowance classes, are not considered within the scope of the present NWIP.
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