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Electromagnetic Utility Locator Services

Electromagnetic locators allow us to find conductive utilities such as phone, electric, and water lines. Our receivers pick up the metallic body below the ground, and then its position and orientation is marked on the surface per CGA and APWA standards.

This method uses a transmitter to apply a detectable signal to the buried line. A receiver detects this signal and provides information about the signal field, including the horizontal centerline of the field, intensity of the field, and estimated distance to the center of the signal.

METHODS

Direct Connection: Allows a low frequency to be transmitted directly through the line. This method of utility locating is best for targeting a single utility in a congested area due to low levels of signal bleed off to other lines in the area.

Clamp Induction: The induction clamp (coupler) method produces a strong EM signal field within the clamp which is transferred to the conductor encircled by the coupler clamp. This method can be used without making metal-to-metal contact to the line. The clamp is ideally used for applying signals to live cables. A signal is transferred from clamp to cable without taking the cable out of service in a pedestal, manhole, electrical panel or junction box.

Broadcast Induction: This method is an indirect way to induce a signal from the transmitter to a buried line. This technique is use to sweep an area for conductive lines that may not be evident during the initial inspection.