Non-intrusive detection of live electrical lines

摘要: A method for determining a presence of live 3-phase electrical lines inside buried pipe or conduit from outside the and preferably an above ground location. sensor suitable detecting vibratory signals is placed on proximate location pipe. The then used to determine current frequency signal harmonic signal, whereby and/or corresponds line within conduit. Although intended primarily use in connection with pipes, may also be employed exposed pipes conduits.