Is5710sa r c d test label 130x60 pk10 s a vinyl industrial signs is5710sa these labels state important this installation or part of it is protected by a residual current device which automatically switches off the supply if an earth fault develops it should be tested quarterly by pressing the marked 39 t 39 or 39 test 39 the wording then goes on to explain what to do if the device fails industrial signs is5710sa r c d test label 130x60 pack of 10 s a vinyl