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Warning
If the voltage source exceeds the specified
limits of the voltage tester the voltage tester
may be damaged and the operator may be
exposed to a shock hazard. Always check the
voltage magnitude of the voltage source before
proceeding with a proving check.
3.6 Testing Considerations
From some directions the neutral and earth
conductors in cables will shield the live, so
it is important that a cable is probed from all
directions.
When testing for the presence of voltage in multi-
core cables always run the probe tip along a short
length of cable so as to overcome the shielding
effect of the natural twist in conductors.
Be aware that if the presence of AC voltage
is not indicated, voltage could still be present. The
unit indicates active voltages in the presence of
electrostatic fields. If the field strength is low the
unit may not indicate. This could be due to factors
such as:
Low mains voltage (<12V AC)
u
Shielded wire/cables
u
Thickness and types of insulation
u
Distance from the voltage source
u
If testing at locations with high background noise
levels, always determine whether the buzzer is
perceptible before relying solely on the buzzer
indication.
3.7 Testing for the Presence of Voltage
Non-contact voltage testers are not suitable
for proving dead. A two pole voltage detector
should always be used for that purpose.
7
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