G - Physics – 01 – R
Patent
G - Physics
01
R
317/11, 324/59
G01R 19/155 (2006.01) E21B 17/00 (2006.01) E21B 47/09 (2006.01) G01R 15/14 (2006.01) G01R 19/165 (2006.01)
Patent
CA 1265582
ABSTRACT OF THE DISCLOSURE A system is disclosed herein in which an electrically conductive boring device is caused to move through the ground to provide an underground tunnel, to install underground utilities, or for any other reason. There is also disclosed herein a technique for detecting if the boring device electrically engages an underground source of high voltage such as in existing underground utility line. This arrangement, is also suitable for detecting if other electrically conductive apparatus, structural member, or like means engages a similar underground source of high voltage includes means defining an electrically conductive path leading from the boring device or other such member to a grounding point sufficient to reduce to a negligible level any high voltage to which the device or like member may be subjected. The present technique monitors the current through the grounding path and indicates if the current level through the path reaches a predetermined threshold level which is selected to correspond with the presence of high voltage.
537636
Smart & Biggar
Utilx Corporation
LandOfFree
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