are such that the probability of their failure can be evaluated and their effects are of a standard equivalent to that achieved by safety devices that meet the criteria set out in points (a) and (b).
go mbeidh siad ar dhóigh go mbeifear in ann an dóchúlacht maidir lena dteipeadh a mheas agus go mbeidh a n-éifeachtaí ar chaighdeán comhionann leis sin arna bhaint amach ag feistí sábháilteachta a chomhlíonann na critéir a leagtar amach i bpointe (a) agus i bpointe (b).