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25
Operating Procedures
01.4IB.50026A
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 & 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. With the ground and test device out of
the breaker compartment, verify the
correct compartment compatibility of the
ground and test device. The ground and
test devices supplied per installation are
prominently marked “CUSTOMER” across
the front for ease of identification.
2. Obtain the KCF (Key Customer Feeder)
through proper customer control
procedures.
3. Insert the KCF key into key lock K1
(Figure 11) and rotate the key. The switch
associated with K1 opens. The “Close”
control circuit of the ground and test device
is now electrically disabled. The KCF key
is now captive and has electrically locked
the ground and test device in the “open”
position. The KB key is now removable.
Figure 11 Inserting KCF Key into Key Lock K1
