in contact with switching layer 116 this conductive layer 118 must have a resistance that is insignificant compared with that of the semiconductive layer 114 and is preferably soft aluminum tape approximately 0 002 to 0 003 inch thick this conductive layer 118 may be affixed to the switching layer 116 by means of a layer of pressure sensitive conductive adhesive 112 referring now to fig4 a as with the previous embodiment it can be noted that the semiconductive layer 114 is longitudinally offset from the overlying switching layer 116 and the conductive layer 118 the purpose of which will be discussed in greater detail hereinbelow the switching layer 116 may be provided with reinforcing fiberglass threads 115 as with the previous embodiment which add additional strength to the multilayer tape 110 so that such tape will not buckle or deteriorate during use the fiberglass threads 15 extend in a substantially longitudinal direction along the length of the multilayer tape 110 the underlying semiconductive layer 114 includes a lapping edge 17 which is spaced a predetermined distance a 39 from the edge 119 of the switching layer 116 this predetermined distance is in the range of 0 10 to 0 20 inches and is preferably 0 125 inches the laterally opposing edge 121 of the semiconductive layer 114 is similarly recessed inwardly from the lateral.