Utility Location Services 4- Inductive Methods

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What is the first thing to remember about locating a signal with a couple or clamp?The couple or clamp needs to me completely closed to induce the signal.
Name all the parts of a Inductive Clamp setup in order of flow.1- Transmitter
2- Primary current flow to clamp or couple
3- Closed clamp or couple around conductor
3- Near-End ground secondary current flow to Far- End ground
4- Secondary current flow through soil makes a circuit back to Near-End ground.
Should you remove the Far-End or Near-End grounds in a Clamp Inductive Mode? Why?No. Doing so will break or open the trace circuit and “no” current will flow.

How class of frequencies should you use with a clamp inductive mode and what are they?Three. 8kHz, 82 kHz or 455 kHz will work with the couple or clamp.
What frequency should you not use with Clamp Inductive mode?575 kHz or AUDIO frequency
What is another term for Inductive Mode?Dropping the box.
True or False, Inductive mode or “dropping the box” is the most difficult method of generating a signal.False. It is the simplest method provided one pont od the trace path is known.
Describe placement of the transmitter box for Inductive mode.– Place the transmitter directly over and as close to the buried pipe or cable as possible.
-Line up the transmitters arrow markings parallel with the line direction (as described on the transmitter case).
Name all the parts of a Inductive Mode (“Dropping The Box”) in order of flow.1- Transmitter (BOX)
2- Frequency Current Flow
3- Near-End Ground to cable shield
4- Cable Shield to Far-End Ground
5 – Far-End Ground to soil
6- Secondary current flow to Near-End Ground
True or false. You only need one ground (Near-End or Far-End) to send a signal in Inductive Mode (“Dropping the Box”)? Why?False. Both Near-End and Far-End of the trace cable/conductor must be grounded to soil to maintain continuity of the trace circuit.
How many frequencies are used in Inductive (“Dropping the Box”) mode? What are they?Two. The highest frequencies – 82 kHz or 455 kHz
(33 kHz is mentioned in the video but not the slide.)
When is it not recommended to use Induction Method? Why?Congested areas. The signal can be easily induced to any other cable or pipe which is close and in parallel to the target cable.
What is the minimum range for operation the receiver using inductive method?No less than 25 feet (8 meters) from transmitter to avoid direct reception of the signal.
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