PowlVac
®
Electrically-Operated Ground and Test Device
IB-65060
14
3) Control Voltage Insulation Integrity
If the user wants to check the insulation integrity of
the control circuit, it may be done with a 500-volt or
1000-volt insulation resistance tester or with an AC
high potential tester. The AC high potential test
should be made at 1125 volts, 50 to 60 Hz for one
minute. The charging motor must be disconnected
prior to testing the control circuit. The charging
motor itself may be similarly tested at a voltage not
to exceed 675 volts, 50 to 60 Hz. Be sure to remove
any test jumpers and reconnect the charging motor
when the tests are complete.
4) Electrical Operation Check
To check the basic electrical operation of the ground
and test device, it must be placed near a circuit
breaker test cabinet. To close the device, connect
the secondary disconnect from the test cabinet to the
ground and test device to be tested. The test cabinet
provides control voltage via a secondary disconnect
plug to the ground and test device and the appropri-
ate control switches to verify the CLOSE and OPEN
functions of the ground and test device. With the
Secondary Disconnect plug installed in the ground
and test device being tested, and with key KB cap-
tive, perform the following steps.
To CLOSE the Device
1.
Connect the Remote Operating Station to the
ground and test device and rotate the plug
clockwise to lock (Figure 23).
2.
Turn the Test Cabinet power ON. Verify that the
Control Selector Switch is in the OFF position
(Figure 22).
4.
Move the Control Selector Switch to the CLOSE
position (Figure 25).
5.
Turn the Remote Operating Station to the ON
position and depress the CLOSE push button
(Figure 26).
6.
Move the Control Selector Switch to the OFF
position (Figure 27).
To OPEN the Device
7.
Move the Control Selector Switch to the OPEN
position (Figure 56).
8.
Turn the Remote Operating Station to the ON
position and depress the OPEN push button on
the Remote Operating Station to open the ground
and test device (Figure 57).
9.
Move the Control Selector Switch to the OFF
position (Figure 58) and turn the Test Cabinet
power OFF.
10. Disconnect the Remote Operating Station umbili-
cal cord from the ground and test device (Figure
59).
When the electrical check is completed, disconnect
the Secondary Disconnect of the test cabinet from
the ground and test device.
E. INSERTING THE ELECTRICAL GROUND AND
TEST DEVICE INTO THE METAL-CLAD
SWITCHGEAR
Inserting the ground and test device into the metal-
clad switchgear is similar to inserting a circuit breaker
into the switchgear. Refer to instruction book,
IB-65000, for general information about inserting
circuit breakers into metal-clad switchgear. Study
instructions and cautions before attempting to insert a
ground and test device into the switchgear equip-
ment.
NOTE: Access information bulletins on line at the
Powell Industries Web site: [email protected].
To order instruction bulletins by telephone, call Powell
Electrical Manufacturing Company: 1-800-480-7273.
Each ground and test device and metal-clad
switchgear cell are provided with interference plates
(see Figure 2, e). The interference plates are de-
signed to ensure that the ground and test device is
not placed in an incorrect circuit breaker compart-
ment. If an attempt is made to insert an improper
ground and test device into a cell, the coding plates
will interfere with each other and deter the insertion.
The interference occurs before the device reaches
the DISCONNECT position. DO NOT attempt to
force the device past the coded interference plate nor
remove the plate from either the cell or the device.
Remove the incorrect device and insert the proper
one.
For normal insertion of the ground and test device
into the switchgear, the maximum force required on
the levering-in crank will not exceed 35 foot-pounds.
Excessive force may damage the device or the
switchgear equipment.
1) Electrical Ground and Test Device Inspection
1.
Inspect the primary disconnecting devices for
proper lubrication, damage, debris, and dirt.
Ensure that disconnecting devices are in align-
ment and are not bent. If damage or dirt are
