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Operating Procedures
01.4IB.50023A
Ch 5 Operating Procedures
The PowlVac® Electrically Operated Ground and
Test Device is designed to provide access to the
stationary primary disconnecting devices of
metal-clad switchgear compartments to ground
those terminals or to perform tests on either
energized or deenergized circuits. Because this
device gives access to switchgear components that
are normally energized with dangerous voltages,
great care must be exercised when using this
device. All primary circuits should be considered
to be energized until proven otherwise.
The operational instructions given in this
instruction bulletin cover the basic operations
required to use the ground and test device. In
addition, many users will have operational and
interlocking procedures of their own that must be
followed. The operator must be knowledgeable
of any procedures required by the user of
the equipment and should also examine the
drawings furnished with the particular switchgear
equipment being grounded or tested, as these
drawings may include additional information or
instructions.
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Although the PowlVac Electrically Operated
Ground and Test Device is designed and rated
to close against a short circuit current within
its rating, it should not be used to deliberately
apply a ground to an energized line or bus.
The operator should ensure that the circuit to
be grounded is deenergized before closing the
grounding switch.
!
CAUTION
Because the two-high construction of
PowlVac metal-clad switchgear requires the
bus connections to be located on the upper
disconnect stabs of some compartments
and the lower disconnect stabs of other
compartments, it is vital that the operator be
sure which set of disconnect stabs is to be
grounded before inserting the device into
the switchgear compartment. Determine
the circuit to be grounded and carefully
examine the drawings provided with the
switchgear equipment to determine in which
compartment this circuit is located and
whether it is connected to the upper or lower
disconnect stabs. Once this is known, perform
the following:
1. Deenergize the circuit to be grounded.
Ensure that it is deenergized not only at
the switchgear where the ground and test
device is being inserted, but also at the
remote end if it can be energized from that
end.
2. Remove the circuit breaker from the
compartment to be grounded and insert
the ground and test device. Refer to
Ch 4 Installation, E. Inserting Ground and
Test Device Into Switchgear Equipment
for
instructions on inserting the ground and
test device into the switchgear.
3. Verify that the control selector switch is in
the OFF position.
