Marking tape with wire conductors and methods for use

Details Marking tape with wire conductors and methods for use Marking tape with wire conductors and methods for use

G - Physics

01

V

337/29, 324/44,

G01V 3/08 (2006.01) G01V 15/00 (2006.01) H02G 9/02 (2006.01)

Patent

CA 1279112

Abstract of the Disclosure A marking tape that is positioned underground above utility lines wherein the marking tape carries a pair of closely spaced, parallel, insulated conductors that extend the length of the tape and at least one other insulated conductor extending the length of the tape which is separated from the pair of conductors at a distance that is greater than the distance between the conductors of the pair of conductors. Passive markers having a resonant circuit can be selectively placed along the tape wherein the resonant circuit is electromagnetically coupled to the pair of conductors and the other conductor. The other insulated conductor can be one of a pair of conductors similar to the other pair of conductors. A method is disclosed whereby the making tape can be electromagnetically traced with the position of the passive markers established. A method is also disclosed for determining the distance to a break in the tape which causes the pair of conductors to be severed.

543344

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