21
Figure 4-8: Position of Metroclamps When Using Two
4.6
Conductor Identification using a Second Metroclamp
When exposed, multiple conductors are present, for example in conduits or ducts, use the method described below
to identify a specific conductor.
1
Plug a second Metroclamp cable into the jack marked AUX INPUT on the back of the Receiver.
2
Set the Receiver MODE SWITCH to the fourth position – Field Strength only. Turn the Transmitter
ON.
3
Place the Metroclamp around each conductor in succession, making sure that the jaws are fully closed.
The conductor with the highest field strength reading is the target conductor. (Figure 4-7)
Note:
The method will work only if there is no cross bonding on the length of the conductor between the
conductor and the Receiver.
4.7
Marking the Conductor
The following color markings have been established b the American Public Works Association (APWA):
Conductor
Color
electric power lines, cables, or conduits
red
communication lines, cables, or conduits
orange
gas, oil, petroleum, or other gaseous materials
yellow
storm and sanitary sewers; drain lines
green
water, irrigation, or slurry lines
blue
