Buried power line contact alert

Details Buried power line contact alert Buried power line contact alert

1990-03-05

1991-06-25

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340650, 361 91, 324 67, G08B 2100

Patent

active

050271083

ABSTRACT:
A method and a device for use with horizontal boring equipment or excavating equipment while making an underground tunnel or digging near known or unknown electric power lines. The device indicates contact with the electrical conductors, whether the contact is momentary or continuous, by monitoring voltage gradients in the earth and activating an alarm if voltage is sensed.

REFERENCES:
patent: 3916298 (1975-10-01), Ulrich
patent: 4398188 (1983-08-01), Feigal et al.
patent: 4697137 (1987-09-01), Haddon et al.
patent: 4755805 (1988-07-01), Chau

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