I.L. 3778A20B
Effective 11/97 Supersedes I.L. 3778A20A dated March, 1993
Cutler-Hammer
Type VCP-W Electrical Ground and Test Device (Complex)
!
WARNING
Figure 1 Type VCP-W Electrical Ground and Test
Device
TABLE OF CONTENTS
1-1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1-2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1-2.1 Power Grounding Switch Operation . . . . . . . .2
1-2.2 Terminal Selector Switch Operation . . . . . . . .2
1-3 Interlocks and Safety Features . . . . . . . . . . . .2
1-4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1-4.1 Safe Practices . . . . . . . . . . . . . . . . . . . . . . . . .4
1-4.2 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1-4.3 Cable Testing . . . . . . . . . . . . . . . . . . . . . . . . .4
1-4.4 Phasing Out . . . . . . . . . . . . . . . . . . . . . . . . . . .5
READ AND UNDERSTAND THESE INSTRUCTIONS
BEFORE ATTEMPTING TO USE THIS DEVICE.
IMPROPER USE CAN RESULT IN DEATH, BODILY
INJURY AND/OR PROPERTY DAMAGE.
BECAUSE OF THE UNIQUE APPLICATION AND
VAST VARIETY OF SYSTEM AND USER REQUIRE-
MENTS, SPECIFIC OPERATING PROCEDURES
MUST BE DEVELOPED BY THE USER. FAILURE TO
DEVELOP THESE PROCEDURES COULD LEAD TO
IMPROPER USE OR OTHER MORE SERIOUS CON-
SEQUENCES.
1-1 PURPOSE
The VCP-W Electrical Ground and Test Device is
designed for insertion into a Vac Clad-W switchgear
compartment to provide a safe and convenient means to
(Figure 1):
1. Ground the circuit for maintenance work,
2. Apply potential for cable testing,
3. Provide access to both bus and line circuits for
“Phasing out” tests.
1-2 DESCRIPTION
Vac Clad-W switchgear is a two-high arrangement. In
the lower compartment the top terminals normally con-
nect to the main bus and the bottom terminals normally
connect to the incoming line or feeders. In an upper
compartment the opposite normally holds true, i.e. the
top terminals connect to the incoming line or feeders
and the bottom terminals connect to the main bus. This
must be verified for each application. Because of this
two- high arrangement, the bus and line positions of the
Electrical Ground and Test Device terminals and test
ports will vary depending upon whether the device is
used in an upper or lower compartment. Therefore, on
the VCP-W Electrical Ground and Test Device the termi-
nals and selector switch positions are referred to as
“UPPER TERMINALS” and “LOWER TERMINALS”
only. The test ports are labeled “UPPER TERMINALS”
and “SELECTABLE TERMINALS”, Figure 2.
!
CAUTION
I.L. 3778A20B
Page 2
Effective 11/97
This device is longer than the standard VCP-W breaker.
Therefore:
1. Electrical Ground and Test Device must be
handled with extreme care while loading it on or
removing it from the extension rails.
2. The extension rails cannot be engaged or disen-
gaged with the device in the “Test” position -
the device must be either removed or in the
“Connected” position.
3. The device cannot be stored in a Vac Clad-W
breaker compartment. It can only be stored in a
storage compartment.
The stored energy closing mechanism for the power
grounding switch is the same as used in type VCP-W
breakers. It is capable of applying the ground against a
“live” circuit if operational errors have not cleared the cir-
cuit. However, in such a case, the relaying at the
source of power is expected to cause the source inter-
rupter to clear the circuit as this device has no inter-
rupting capability.
1-2.1 POWER GROUNDING SWITCH OPERATION
Closing
The power grounding switch is closed by a control
switch at the end of a 35 ft. long cable (supplied
with the device). The control switch is a spring-
return type to the neutral (unlabeled) position.
Upon turning the control switch to “Close” position
(note that the control switch does not have to be
held in the “Close” position):
1. The closing springs start to charge
2. After the springs are fully charged, they
automatically discharge to close the switch
contacts.
The control scheme (Figure 6) has an interlock
contact KT that prevents the ground switch from
closing when the selector switch is locked in the
“Lower Terminals” position by key interlock KT1 in
Figure 2. Once the ground switch is closed, it can
be locked in the closed position by removing the
cable from the receptacle on the device and locking
the sliding cover that permits access to the
receptacle and manual “Push to Open” button.
Opening
The grounding switch can be opened by manual
operation of the “Push to Open” button located
behind the sliding cover on the device front panel,
Figure 3. If electrical trip is provided at the control
switch (not recommended), for safety reasons the
switch is prevented from opening in less than 20
seconds after closing.
1-2.2 TERMINAL SELECTOR SWITCH
The terminal selector switch and ground switch are
enclosed by clear polycarbonate sheets on the sides
and the top to permit viewing their position when the
device is not in the compartment. The selector switch
is operated by inserting the removable operating handle
onto the selector switch shaft located on the right hand
side of the switch, Figure 5. In order to change position
of the selector switch:
1. Insert the handle,
2. Pull and hold the latch pin out,
3. Turn the handle 90 degrees
a) Clockwise to change from the lower
terminals to the upper terminals
b) Counterclockwise to change from the upper
terminals to the lower terminals
4. Release the latch pin. The pin is spring loaded
and will latch only when the selector switch is in
a fully engaged position. The handle is not
removable if the selector switch blades are in an
intermediate position. Make certain that the pin
is latched. Moving the selector switch to the
upper position connects the upper terminals to
the lower ports and moving it to the lower posi-
tion connects the lower terminals to the lower
ports. The upper terminals are permanently
connected to the upper ports.
1-3 INTERLOCKS AND SAFETY FEATURES
The device is designed to provide as many interlocks
and safety features as practicable for the personnel per-
forming any of the operations described earlier.
The device cannot be levered into or out of the
“Connected” position unless the ground switch is open:
1. Upon levering a device with a closed grounding
switch into or out of the “Test” position, the
switch is tripped open by the floor tripper in the
compartment.
2. In the “Connected” position, the levering crank
is prevented from being engaged with the lever-
I.L. 3778A20B
Page 3
Effective 11/97
ing screw unless the grounding switch is tripped
first.
• The device cannot be placed into the breaker
compartment with the selector switch operating
handle in place - the handle interferes with the
picture frame in the breaker compartment.
• The device cannot be placed into the breaker
compartment with the selector switch in an
intermediate position since the operating handle
is not removable with the selector switch in an
intermediate position.
• An indicator on the front panel shows the status
of the ground switch contacts - “Open” or
“Closed”, Figure 3.
• The grounding switch can be locked closed with
a key interlock or padlock. This is accom-
plished by locking the sliding cover on the
device front panel to prevent access to the man-
ual “Push to Open” button and cable receptacle,
Figure 3.
• The grounding switch cannot be electrically
closed when the upper test ports are open. The
key interlock auxiliary switch contact KT in the
control circuit prevents closing, Figure 6.
• The grounding switch cannot be manually
closed. The spring charging socket and manual
close button are both covered by the device
front panel, Figure 3.
• The grounding switch can be closed only electri-
cally by a control switch at the end of a 50 ft.
cable supplied with the device. Access to the
manual close button is blocked by the device
front panel.
• The power to operate the grounding switch in
this device is obtained through the secondary
disconnect in the breaker compartment.
• The control switch cable is connected to the
device with a twist lock connector.
• The selector switch operating handle can be
removed only when the blades are fully
engaged with either the upper or lower termi-
nals, Figure 5.
• The selector switch operating handle cannot be
inserted when the device is in the breaker com-
partment.
• The selector switch mechanism has a spring
loaded latch pin which holds the blades latched
either to the upper or lower terminals.
• An indicator at the upper left front of the device
shows the status of the selector switch contact
connection Upper Terminals or Lower
Terminals, Figure 3.
• The selector switch can be locked in the lower
position only with a key interlock KT1 in Figure
4. This can be done only when the device is
outside the breaker compartment.
• The upper test ports are permanently connected
to the Upper Terminals.
• When electrical tripping is provided, (not rec-
ommended) the ground switch cannot be
opened electrically in less than 20 seconds after
closing, Figure 6. This feature permits the
source interrupter to clear a fault if the ground-
ing switch is inadvertently closed on an ener-
gized circuit as this device has no interrupt-
ing capability.
• The upper test ports are locked closed with key
interlock KT2 in Figure 2. They can be opened
only when the device is outside the breaker
compartment and the selector switch has been
locked in the lower position by key interlock KTl
in Figure 2 and the key obtained from KTl is
used to unlock key interlock KT2 at the upper
test ports.
• The lower (Selectable Terminals) test ports con-
nect to the selector switch hinges. Figure 2.
• The terminals to be grounded are always con-
nected to the lower (Selectable Terminals) test
ports.
• The lower test ports are always available for
voltage checking.
• The lower (Selectable Terminals) test ports
can be padlocked in the closed position.
I.L. 3778A20B
Page 4
Effective 11/97
1-4 OPERATION
1-4.1 SAFE PRACTICES
A GROUND AND TEST DEVICE IS A SAFETY-
RELATED DEVICE. IT MUST BE RECOGNIZED
THAT IMPROPER USE CAN RESULT IN DEATH,
SERIOUS PERSONAL INJURY, OR PROPERTY
DAMAGE. THAT IS WHY IT IS MOST IMPORTANT
THAT THE USER DEVELOP SPECIFIC AND SAFE
OPERATING PROCEDURES FOR ITS USE.
The following general safe practices are recommended:
• The device cannot be stored in a VAC CLAD-
W Breaker compartment. It can only be
stored in a storage compartment.
• Store the device in a clean, dry area free from
dust, dirt, moisture, etc.
• Keep all insulating surfaces, which include pri-
mary support insulation and insulation barriers,
clean and dry.
• Check all primary circuit connections to
make certain that they are clean and tight.
• Permit only authorized trained personnel to use
this device.
• Take extreme care while using this device to
avoid contacting “Live” or “Hot” (energized) ter-
minals.
• Do not remove the device front panel while
using this device.
• Always close the grounding switch electrically
from the farthest distance with the remote con-
trol switch.
• Before inserting the device into the compart-
ment, correctly identify line and bus termi-
nals for the breaker compartment and visual-
ly make certain that the selector switch is con-
nected to the desired terminals. Also make cer-
tain that the connected terminals are Bus or
Line as desired.
Typical procedures for use of this device are as follows:
1-4.2 GROUNDING
1. With the device out of the breaker compartment,
insert the selector switch operating handle and
set the switch for upper or lower terminals as
desired. Remove the handle.
DO NOT ATTEMPT TO OPERATE THE SELECTOR
SWITCH WHEN IT IS ON THE EXTENSION RAILS.
FAILURE TO COMPLY COULD RESULT IN THE
DEVICE COMING OFF THE RAILS CAUSING BODILY
INJURY AND/OR EQUIPMENT DAMAGE.
2. Lift the device and load it on to the extension
rails of the breaker compartment with extreme
care.
3. Push the device to the Test position as indi-
cated by the crisp clicking sound of the levering
latch engaging the levering nut.
4. Using the breaker levering crank, lever the
device to the “Connected” position as indicated
by the red flag appearing in front of and under
the levering crank.
5. Unlock and open the lower test ports
(Selectable Terminals) and test for “dead”
circuit using correctly rated neon test stick or
equivalent.
6. After the circuit is checked “dead” and made
certain that it is maintained “dead”, connect the
remote control switch cable and close the
grounding switch from the safest distance.
7. Padlock the ground switch closed by discon-
necting the control switch cable and sliding the
cover to the left. It may also be locked by an
optional key lock K3,if provided (Figure 3).
1-4.3 CABLE TESTING
1. With the device out of the breaker compartment,
insert the selector switch operating handle and
set the switch for upper or lower terminals as
desired. Remove the handle.
!
CAUTION
!
WARNING
I.L. 3778A20B
Page 5
Effective 11/97
DO NOT ATTEMPT TO OPERATE THE SELECTOR
SWITCH WHEN IT IS ON THE EXTENSION RAILS.
FAILURE TO COMPLY COULD RESULT IN THE
DEVICE COMING OFF THE RAILS CAUSING BODILY
INJURY AND/OR EQUIPMENT DAMAGE.
2. Lift the device and load it on the extension rails
of the switchgear compartment with extreme care.
3. Push the device to the Test position as indicat-
ed by the crisp clicking sound of the levering
latch engaging the levering nut.
4. Using the breaker levering crank, lever the
device to the “Connected” position as indicated
by the red flag appearing in front of and under
the levering crank.
5. Unlock the lower (Selectable Terminal) test port
and test for “dead” circuit using correctly rated
neon test stick or equivalent.
6. After the circuit is checked “dead” and made
certain that it is maintained “dead”, insert the
insulated test probes into the lower test ports.
With the grounding switch open, apply the test
voltage to the cables via the insulated test
probes.
1-4.4 PHASING-OUT
1. With the device out of the switchgear enclosure,
engage the selector switch operating handle
and set the selector switch to the lower position.
Remove the handle.
DO NOT ATTEMPT TO OPERATE THE SELECTOR
SWITCH WHEN IT IS ON THE EXTENSION RAILS.
FAILURE TO COMPLY COULD RESULT IN THE
DEVICE COMING OFF THE RAILS CAUSING BODILY
INJURY AND/OR EQUIPMENT DAMAGE.
2. Lock the selector switch in the lower position
and remove key from key interlock KT1 in
Figure 4.
3. Insert the key removed in step 2 into the key
interlock 2 in Figure 2 and open upper test
ports. Unlock the lower test ports, if padlocked.
4. Lift the device and load it on the extension rails
of the compartment with extreme care.
5. Push the device to the Test position as indicat-
ed by crisp clicking sound of the levering latch
engaging the levering nut.
6. Using the breaker levering handle, lever the
device to the “Connected” position as indicated
by the red flag appearing in front of and under
the levering crank.
7. Check the “Phasing Out” according to the spe-
cific customer’s operating procedure.
!
CAUTION
!
CAUTION
I.L. 3778A20B
Page 6
Effective 11/97
Figure 2 Side View
34.81
3000A
3.88
1
2
3
4
5
6
34.69
1200 / 2000 A
13.63
12.00
9
8
7
➀ KT2 - Upper terminal test
ports key interlock
➁ Selectable terminal test ports padlock
➂ Grounding switch operation key interlock
➃ Lever latch handle
➄ Grounding switch blade
➅ KT1 - Key interlock with auxiliary switch
➆ Selector switch blade
➇ Upper terminals
(3000A shown)
➈ Lower terminals
(1200/2000A shown)
I.L. 3778A20B
Page 7
Effective 11/97
Figure 3 Front
1
2
3
4
5
6
9
8
7
10
11
12
13
14
15
16
29.00
27.81
29.50
➀ Upper terminal port
➁ KT2 - Upper terminal test
ports key interlock
➂ Selector switch position indicator
➃ Selectable terminal port
➄ Selectable terminal test ports padlock
➅ Operations counter
➆ Grounding switch position indicator
➇ Grounding switch operation interlock
➈ Grounding switch access panel
Remote control receptacle
11 Ground contact
12 Control switch
13 Manual trip button
14 Floor tripper
15 Code plate
16 Rating plate
➉
29.56
I.L. 3778A20B
Page 8
Effective 11/97
Figure 4 Selector Switch Interlock KT1
2
7
1
3
6
5
4
➀ KT1 - Interlock key
· Removable only when selector switch
locked with lower terminals
· With key removed, grounding
switch cannot be closed
➁ KT1 - Key interlock
➂ Key interlock bolt (shown locking selector
switch in lower position)
➃ Selector switch interlock plates
➄ Selector switch position latch pin
➅ Selector switch operating lever
(switch engaged with lower terminals)
➆ Selector switch operating shaft
I.L. 3778A20B
Page 9
Effective 11/97
Figure 5 Selector Switch Operating Handle
2
1
1
3
4
➀ Selector switch operating handle engaged
(switch connected with lower terminals)
➁ Spring loaded latch pin
· Pull to engage selector switch handle
· Release after removing handle
➂ Spring loaded latch pin operating ring
➃ Handle position showing selector switch
engaged with upper terminals
I.L. 3778A20B
Page 10
Effective 11/97
Figure 6 Control Scheme - Power Trip
Control Switch Box with 50 ft. # 14-3 Cable
and 3 Prong Male Twist Lock Connector
Ground and Test Device has 3 Hole Female Socket
KT
PS
WHITE
CLOSE
OPEN
W
1
TD
X
Z
R
24
TD
M
SR
Y
ST
GREEN
OR
RED
TD
Y
LS1
b
LS2
b
Y
Y
a
a
CS = Control Switch:
Vertical : No Circuit (Spring Return Position)
CW : Close
CCW : Trip
Y = Anti Pump Relay
M = Charging Motor
LS = Limit Switch (Shown - Spring Discharged)
ST = Shunt Trip Coil
TD = Time Delay Relay : Seals in to Complete Charging & Closing,
20 Seconds Delay on Dropout, Blocks Tripping for 20 Seconds
After Closing
a = Auxiliary Switch Contact
b = Auxiliary Switch Contact
SR = Spring Release coil
KT = Key Interlock Contact
R = Bridge Rectifier
PS = Position Switch (Prevents Charging Between “Test” and
“Connected” Positions)
I.L. 3778A20B
Page 11
Effective 11/97
Figure 7 Control Scheme - Manual Trip
Control Switch Box with 50 ft. # 14-3 Cable
and 3 Prong Male Twist Lock Connector
Ground and Test Device has 3 Hole Female Socket
KT
PS
WHITE
CLOSE
W
1
Y
X
R
24
M
SR
Y
LS1
b
LS2
Y
CS = Control Switch:
CCW __Charge & Close
Vertical : No Circuit (Spring Return Position)
Y = Seal in Relay
M = Charging Motor
LS = Limit Switch (Shown - Spring Discharged)
SR = Spring Release Coil
KT = Key Interlock Contact
R = Bridge Rectifier
PS = Position Switch (Prevents Charging Between “Test” and
“Connected” Positions)ß
BLACK
Cutler-Hammer
Five Parkway Center
Pittsburgh, PA 15220
Effective 11/97 (ISI)
Style 3778A20B
Printed in U.S.A.
I.L. 3778A20B
Page 12
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