Fluke C9970 User Manual page 15

Voltage Detector
Applications
Base of Pole: Telephone Plant Repairs
Before you climb a telephone pole, verify there are no hazards. On the telephone
pole or adjacent spans, examples of hazards include but are not limited to
potential electrical hazards such as a vertical power ground wire, vertical metallic
power conduit, street light fixture, power company primary disconnect hardware,
or other foreign metal objects, improper clearance from power conductors or
equipment, dangling power wires, inadequate clearance on pole-to-pole guys
from power wires or energized attachment, or other hazards.
If a vertical power ground wire is present or if a vertical metallic power conduit or
other power company hardware extends to the base of the pole, do a voltage test
of the wire before you climb or work on the pole. If the ground wire is broken, test
the portion of the wire that goes up the pole unless the break exists above the
telephone space. Do not test a broken ground wire or fixture in the power
company's space (≥40 inches above the highest telephone attachment). Refer to
the safety procedures of your company
If the Product does not indicate a hazardous voltage, you can climb a pole that
carries vertical power ground wires. Avoid simultaneous contact between power
ground wires and telephone cable or guys because a small voltage may be
present that may cause a shock that might cause you to a fall from the pole.
If an ungrounded street light fixture is <40 inches above or below telephone
attachments and is on a pole not that does not carry a telephone cable or a bare
vertical power ground wire, wear insulating gloves when you do repairs. Avoid
contact with the fixture because you cannot place a temporary bond to an
effective ground.
 Warning
Do not make contact with supply wires going to the fixture.
Ungrounded Insulated Conductors
Ungrounded insulated conductive objects in the presence of live ac current may
act as antennae for ac potential. If a voltage test indicates the conductive object is
not safe, avoid the object.
Traffic Lights
Be careful near traffic light wiring or other wiring which may become energized
momentarily. Voltage test results received during one part of a cycle may not be
valid during another part of a cycle.
13