The optimum level of protection to be taken into account in the design is that beyond which the constraints imposed by the wearing of the PPE would prevent its effective use during the period of exposure to the risk or the normal performance of the activity.
Is é an barrleibhéal cosanta atá le cur san áireamh sa dhearadh an leibhéal sin atá thar an leibhéal ag a gcuirfeadh srianta, de dheasca an TCP a bheith á chaitheamh, bac ar é a úsáid go héifeachtach le linn na tréimhse neamhchosanta ar an riosca nó le linn gnáthfheidhmiú na gníomhaíochta.