TWO-POLE CIRCUIT APPLICATIONS
For all two-pole applications (U.S. 240VAC) described in this section, you will create a closed
circuit by attaching both test leads of the transmitter to the power circuit’s conductors (lines).
The exact connection depends on whether the power circuit is live (energized) or dead
(de-energized).
For live circuits:
Connect the transmitter’s + jack to the phase line and the
jack to the neutral line. If the circuit
is unloaded, the modulated output of the transmitter will be coupled into the neutral line by the
circuit’s distributed capacitance and then return to the transmitter.
For dead circuits:
Connect the transmitter’s + jack to a terminal of any conductor, connect the
jack to the
terminal of another parallel conductor, and then connect the other two terminals of the circuit to
each other. In this configuration, the modulated output of the transmitter will directly return to it
through the power circuit.
Alternatively, the two test leads of the transmitter can be connected to the two ends of the
conductor. Or the transmitter’s + jack can be connected to a terminal of any conductor while the
jack can be connected to the power circuit’s
protective grounding terminal.
Locating a Socket, Switch, Junction Box or
Fuse or Tracing a Line
For all applications in this section:
• If the circuit is dead, the transmitter only sends
a transmitting code to the component to be
located.
• If the circuit is live, the transmitter not only
sends encoding signals to the circuit to be
detected, but also measures and displays the
voltage of the live circuit.
Fig. 11 shows how to connect the transmitter and
how to position the receiver to locate various
components. Note the similarities and differences
between this configuration and the configuration for single-pole circuits shown in Fig. 7.
To proceed, use the same procedure used for “Locating a Cable or Line Break Behind a Wall”
section on p. 8. As before, a component or line can be precisely located by adjusting the
transmitter’s output power and then operating the receiver in manual mode and adjusting its
sensitivity. In both of these applications, the stronger the signal received, the closer the receiver
is to the component to be located or the line to be traced. When tracing a line, an abrupt decline
in received signal power indicates a line break.
12
Fig. 11. Locating a socket, switch,
junction box or fuse or tracing a line