n
The instrument
should not
be used if any part of it is damaged.
n
Test leads, probes and crocodile clips
must
be in good order, clean and
with no broken or cracked insulation.
n
All test leads supplied with the instrument form part of the measuring
circuit of the instrument. They
must
not
be modified or changed in any
way, or be used with any other electrical instrument or appliance.
n
A plug severed from the power cord
MUST
be destroyed, as a plug with
bare conductors is hazardous in a live socket outlet.
n
Ensure that hands remain behind guards of probes/clips when testing.
n
U.K. Safety Authorities recommend the use of fused test leads when
measuring voltage on high energy systems.
n
Replacement fuses
must
be
of the correct type and rating.
n
Failure to fit the correctly rated fuse will result in damage to the
instrument in the event of an overload.
n
Special precautions are necessary when operating in situations where
“live” earths may be encountered: isolation switches and fuses (not
supplied with this instrument) must be used.
n
Special precautions are necessary when working near high tension
systems (MV and HV): rubber gloves and shoes (not supplied with this
instrument) should be worn.
n
Special precautions are necessary when working in wet conditions or
in agricultural areas: observe the local safety standards and take all
necessary special precautions applicable to the particular location and
do not touch the test leads with bare hands.
LIVE EARTH SAFETY PRECAUTIONS
n
A ‘Live’ earth is one that carries current from the mains supply, or could
do so under fault conditions. The following warnings apply in addition
to those listed previously.
n
All persons involved
must be
trained and competent in isolation and
safety procedures for the system to be worked on. They
must be
clearly
instructed not to touch the earth electrode, test stakes, test leads, or their
terminations if any ‘Live’ earths may be encountered. It is recommended
that they wear appropriate rubber gloves, rubber soled shoes, and stand
on a rubber mat.
n
The earth electrode under test
should be
isolated from the circuit it
is protecting before testing commences. If this is not possible, ART
(attached Rod Technique) may be used to measure electrode resistance.
n
The instrument terminals
should be
connected to the system under test
through isolation switches that are rated to handle the likely maximum
fault voltages and currents that could be encountered at the installation.
The isolation switch
must be
open whilst any personal contact is made
with the remote test stakes, or the connecting leads, e.g. when changing
their position.
n
The instrument terminals
should be
connected to the system under test
through fuses that are rated to handle the likely maximum fault voltages
and currents that could be encountered at the installation.
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