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29
Operating Procedures
01.4IB.50023A
c. t
eStInG
p
ortS
The three (3) test ports provided on the front
of the ground and test device may be used to
provide access to the primary disconnecting
devices of the switchgear compartment for
testing purposes. Three (3) test probes are
provided for use in these test ports.
The test ports are covered with shutters, one
shutter for the upper three test probes. The
shutters and test probes are made so that the
shutter will interlock with a groove around
the circumference of the test probe when the
test probe is fully inserted into the test port,
holding the test probes captive in the ground
and test device.
The test ports are connected to the primary
disconnecting devices. Each test probe is
provided with a threaded stud projecting from
the outer end of the probe. This stud may be
used for attaching leads to test apparatus. The
thread is 3/8-16 UNC. Since the end of these
studs is accessible when the test probes are
inserted in the test receptacles, the stud will
be energized if the ground and test device
is connected to an energized circuit. It is
imperative that the operator insulate the ends
of these test probes before inserting them into
the ground and test device.
Even when insulated, the test probes should
not be handled when energized. The test
probe insulation is only one part of a complete
line-to-ground insulation system and the
surface of the test probe may be energized at
a voltage above ground potential.
!
CAUTION
The test probes are not high current devices.
They are suitable for testing procedures such
as high potential testing, phasing out circuits,
phase rotation testing, and primary voltage
measurements.
Since the test probes give access to primary
circuits, it is essential that any test apparatus
connected to the test probes be rated for the
primary circuit voltage. Test leads used for
these connections must also be rated for the
primary circuit voltage.
Actual testing procedures are to be determined
by the user, taking into account the safety
practices and cautions given in this instruction
bulletin.
