CHECKING THE LACK OF VOLTAGE HOME » RAIL » CATENARY GROUNDING & MAINTENANCE » CHECKING THE LACK OF VOLTAGE DT1036 Bipolar voltage detector 400V – 3600V (export and public transport) The voltage detector is used to check that there is no voltage on an overhead line before it is grounded on rail networks 750V, 1500V ou 3000V PITM Insulated reinforced pole with foam-cover upper tube (export and public transport) The telescopic insulating pole can be used to place the universal switch rod head on the overhead wire during verification or lockout operations on live cables.