Siemens 38-3AH3-GTD User manual

Instruction manual
Type 38-3AH3-GTD (B, D, E and F) 38 kV
electrically operated ground and test device
Installation operation maintenance E50001-F710-A243-V2-4A00
usa.siemens.com/mvswitchgear

Arc flash hazard and hazardous voltages.
Will cause death, serious injury or property damage.
Always de-energize and ground the equipment before maintenance.
Read and understand this instruction manual before using equipment.
Maintenance should be performed only by qualified personnel. The use
of unauthorized parts in the repair of the equipment or tampering by
unqualified personnel will result in dangerous conditions which will cause
death, severe injury or equipment damage. Follow all safety instructions
contained herein.
Important
The information contained herein is general
in nature and not intended for specific
application purposes. It does not relieve the
user of responsibility to use sound practices
in application, installation, operation and
maintenance of the equipment purchased.
Siemens reserves the right to make changes
in the specifications shown herein or to
make improvements at any time without
notice or obligation. Should a conflict arise
between the general information contained
in this publication and the contents of
drawings or supplementary material or
both, the latter shall take precedence.
Qualified person
For the purpose of this instruction manual a
qualified person is one who is familiar with
the installation, construction or operation of
the equipment and the hazards involved. In
addition, this person has the following
qualifications:
lIs trained and authorized to
de-energize, clear, ground and tag
circuits and equipment in accordance
with established safety procedures.
lIs trained in the proper care and use of
protective equipment, such as: rubber
gloves, hard hat, safety glasses or face
shields, flash clothing, etc., in
accordance with established safety
practices.
lIs trained in rendering first aid.
Further, a qualified person shall also be
familiar with the proper use of special
precautionary techniques, personal
protective equipment, insulation and
shielding materials, and insulated tools and
test equipment. Such persons are permitted
to work within limited approach of exposed
live parts operating at 50 volts or more, and
shall, at a minimum, be additionally trained
in all of the following:
lThe skills and techniques necessary to
distinguish exposed energized parts from
other parts of electric equipment
lThe skills and techniques necessary to
determine the nominal voltage of
exposed live parts
lThe approach distances specified in NFPA
70E® and the corresponding voltages to
which the qualified person will be
exposed
lThe decision-making process necessary
to determine the degree and extent of
the hazard and the personal protective
equipment and job planning necessary to
perform the task safely.

Note:
These instructions do not purport to cover
all details or variations in equipment, nor to
provide for every possible contingency to be
met in connection with installation, operation
or maintenance. Should further information
be desired or should particular problems
arise that are not covered sufficiently for the
purchaser’s purposes, the matter should be
referred to the local sales office.
The contents of this instruction manual
shall not become part of or modify any prior
or existing agreement, commitment or
relationship. The sales contract contains the
entire obligation of Siemens Industry, Inc.
The warranty contained in the contract
between the parties is the sole warranty
of Siemens Industry, Inc. Any statements
contained herein do not create new
warranties or modify the existing warranty.
Table of contents
Introduction 02 – 05
Description 06 – 12
Operation - device types B and D 13 – 30
Operation - device types E and F 31 – 46
Schematic 47

4
The purpose of this instruction manual is
to assist the user in developing safe and
efficient procedures for the installation,
maintenance and use of the equipment.
This instruction manual should be used
jointly with the type 38-3AH3 vacuum
circuit breaker instruction manual, E50001-
F710-A238-X-XXXX and type GM38
switchgear instruction manual,
E50001-F710-A236-X-XXXX.
Contact the nearest Siemens representative
if any additional information is desired.
Introduction
The type 38-3AH3-GTD electrically operated
ground and test device is designed for use
with Siemens type GM38 metal-clad
switchgear up to 38 kV. The ground and
test device is designed to meet all applicable
ANSI, NEMA and IEEE standards. Successful
application and operation of this equipment
depends as much upon proper installation
and maintenance by the user as it does
upon the proper design and fabrication
by Siemens.
Introduction
Arc-flash hazard and hazardous voltages.
Will cause death, serious injury or property damage.
Always de-energize and ground the equipment before maintenance.
Read and understand this instruction manual before using equipment.
Maintenance should be performed only by qualified personnel. The use
of unauthorized parts in the repair of the equipment or tampering by
unqualified personnel will result in dangerous conditions which will
cause death, severe injury or equipment damage. Follow all safety
instructions contained herein.
Arc flash hazard and hazardous voltages.
Will cause death, serious injury or property damage.
To avoid arc flash burns or electrical shock, only qualified personnel
should work on or around this equipment after becoming thoroughly
familiar with all danger or warning notices, and procedures contained
herein. Personnel must observe all applicable regulations (e.g., OSHA),
follow all requirements of NFPA 70E and adhere to specific operating
procedures applicable to the installation. Use appropriate personal
protective equipment (PPE) for the voltage and arc flash incident
energy exposure.

5
Signal words
The signal words “danger,” “warning” and
“caution” used in this manual indicate the
degree of hazard that may be encountered
by the user. These words are defined as:
Danger – Indicates an imminently
hazardous situation that, if not avoided, will
result in death or serious injury.
Warning – Indicates a potentially hazardous
situation that, if not avoided, could result in
death or serious injury.
Caution – Indicates a potentially hazardous
situation that, if not avoided, may result in
minor or moderate injury.
Caution (without safety alert symbol) –
Indicates a potentially hazardous situation
that, if not avoided, may result in property
damage.
Hazardous procedures
In addition to other procedures described in
this instruction manual as dangerous, user
personnel must adhere to the following:
1. Always work only on de-energized
equipment. Always de-energize a circuit
breaker or ground and test device and
remove it from the switchgear before
performing any tests, maintenance or
repair.
2. Always perform maintenance on the
circuit breaker or ground and test device
after the spring-charged mechanisms
are discharged (except for test of the
charging mechanisms). Check to be
certain that the indicator flags read
OPEN and DISCHARGED.
3. Always let an interlock device or safety
mechanism perform its function without
forcing or defeating the device.
Field service operation and
warranty issues
Siemens can provide competent, well-
trained field service representatives to
provide technical guidance and advisory
assistance for the installation, overhaul,
repair and maintenance of Siemens
equipment, processes and systems.
Contact regional service centers, sales
offices or the factory for details, or
telephone Siemens field service at
1-800-333-7421 or 1-423-262-5700
outside the U.S.
For medium voltage customer service
issues, contact Siemens at 1-800-333-7421
or 1-423-262-5700 outside the U.S.

6
This instruction manual describes the type
38-3AH3-GTD electrically operated ground
and test device suitable for insertion into
switchgear enclosures in the space normally
occupied by a circuit breaker. Refer to
E50001-F710-A236-X-XXXX instruction
manual for type GM38 switchgear and
E50001-F710-A238-X-XXXX instruction
manual for the type 38-3AH3 38 kV circuit
breaker as supplements to the discussion
of the type 38-3AH3-GTD ground and test
device in this instruction manual.
The type GM38 switchgear instruction
manual contains information on the correct
procedures to be employed in racking of the
ground and test device.
The type 38-3AH3 38 kV circuit breaker
instruction manual contains information on
handling, storage, description of operating
mechanism, field tests and maintenance
requirements.
The ground and test device system consists
of the following components:
lGround and test device
lRemote open/close pushbutton station
and control cable
lTest probes (cables not provided)
lThis instruction manual.
The following accessories may also be
required:
lRacking crank
lManual spring charging crank
lEither a split plug jumper or test cabinet
lExtension rails (for cells not at floor level
or cells installed on a "housekeeping pad")
lLifting yoke or lift truck.
If required, these accessories should be
provided with the switchgear structures.
Test cables and voltage test or measurement
equipment are not provided with the ground
and test device.
Control
Electrical operation is required to
accomplish the grounding function of the
type 38-3AH3-GTD ground and test device.
Control circuits are made through a remote
open/close pushbutton station and control
cable, that is connected to the ground and
test device by use of a plug and receptacle
mounted on the ground and test device
front panel.
The "grounding" operation is enabled by
selecting the "close" function on the selector
switch mounted on the front panel of the
ground and test device. The selector switch
is operable only after specific interlock
requirements have been satisfied. Once the
"close" function has been selected, the
device may be closed to ground the upper
studs (disconnects) or lower studs
(disconnects), as determined by the device
type (refer to Table 1: Type 38-3AH3-GTD
ground and test device types on page 7) by
pushing the "close" pushbutton on the
remote pushbutton station.
The "opening" operation is enabled by
selecting the "trip" function on the selector
switch. The selector switch is operable only
after specific interlock requirements have
been satisfied. Once the "trip" function has
been selected, the device may be opened
(to disconnect the primary studs from
ground) by pushing the "open" pushbutton
on the remote pushbutton station.
Current rating
The ground and test device does not have a
continuous current rating. The ground and
test device is suitable for use in circuit
breaker cells rated 1,200 A or 2,000 A (self-
cooled) or 3,000 A (fan-cooled), without
the need for special adapters. The primary
contact finger assemblies are designed to fit
all cell continuous current ratings,
eliminating the need for special adapters.
Type 38-3AH3-GTD ground and test devices
are universal, and can be used in any type
GM38 switchgear circuit breaker
compartment.
Description

7
Operating mechanism
The operating mechanism and the
associated vacuum interrupters are identical
to those used in the standard type 38-3AH3
38 kV circuit breaker. The function and
maintenance requirements of these
elements are discussed in instruction
manual E50001-F710-A238-X-XXXX.
Ground and test device types
Separate types of the ground and test device
are available, which vary depending on
which set of studs is configured to be
grounded, and whether the test ports are
provided for one set or both sets of studs.
These are listed in Table 1: Type 38-3AH3-
GTD ground and test device types and are
described below:
lTypes D and F: Device for grounding
upper studs
A ground and test device arranged to
allow the upper primary studs to be
connected to ground has conductive
copper primary extensions in the upper
primary disconnect position. These
devices are available in two types:
lType D: Provided with both upper
(conductive) and lower (dummy)studs,
and with both lower and upper test
ports. The lower test port slide is
equipped with a key interlock.
Operation instructions for type D
devices are contained in the Operation -
device types B and D section of this
instruction manual.
lType F: Provided with upper
(conductive) studs and with upper test
ports. Lower studs and test ports are
not provided with this device type.
Operation instructions for type F
devices are contained in the Operation -
device types E and F section of this
instruction manual.
lTypes B and E: Device for grounding
lower studs
A ground and test device arranged to
allow the lower primary studs to be
connected to ground has conductive
copper primary extensions in the lower
primary stud (disconnect) position.
These devices are available in two types:
lType B: Provided with both lower
(conductive) and upper (dummy)studs,
and with both lower and upper test
ports. The upper test port slide
is equipped with a key interlock.
Operation instructions for type B
devices are contained in the Operation -
device types B and D section of this
instruction manual.
lType E: Provided with lower
(conductive) studs and with lower test
ports. Upper studs and test ports are
not provided with this device type.
Operation instructions for type F
devices are contained in the
Operation - device types E and F
section of this instruction manual.
The device type (B, D, E or F) is indicated on
the device label on front of the ground and
test device.
“Conductive studs” are designed for carrying
heavy current during grounding operations.
“Dummy studs” are for voltage test purposes
only, and are not rated to carry significant
current.
Table 1: Type 38-3AH3-GTD ground and test device types
Description Device type
B
Device type
D
Device type
E
Device type
F
Number of studs
(disconnects) 6633
Number of test probes 6633
Which studs can be
grounded? Lower Upper Lower Upper
Upper studs Dummy Conductive None Conductive
Upper test ports Yes (with key
interlock) Yes None Yes
Lower studs Conductive Dummy Conductive None
Lower test ports Yes Yes (with key
interlock) Yes None
Front view figure 4611 13
Side view figure 5712 14
Elementary diagram 8915 16

8
Hazardous voltages during testing.
Will cause death, serious injury or property damage.
The user must provide test cables. These cables must be adequate for
the test voltages used, and must be in good condition.
The use of inadequate test cables will result in dangerous conditions
which will cause death, severe injury or equipment damage.
Test ports
Depending on the device type (refer to Table
1: Type 38-3AH3-GTD ground and test
device types on page 7), one or two sets of
three-phase test ports are provided on the
front panel. The lower test ports are
connected to the lower studs. The upper
test ports are connected to the upper studs.
Test probes
Depending upon the device type (refer to
Table 1: Type 38-3AH3-GTD ground and test
device types on page 7), a set of three or six
test probes are provided as a convenient
means of connecting test leads to the
device. Test probes are inserted into deep
wells and make an electrical connection as a
bayonet terminator enters the socket with a
detent action. The probes are fully self-
aligning. The probes can be secured in place
by positioning the sliding test port to a third
position, which engages the test probe. This
feature also verifies that the probes are fully
inserted.
Test probes are provided which must be
fitted with test cables by the user. The
choice of cable must be carefully reviewed
by the user to ensure that it is adequate for
the intended purpose.
Cables required for use with test probes are
not provided with the ground and test
device. The user must provide these cables
to suit the test equipment (for example,
dielectric high-potential test sets) to be
used. The cables do not provide a grounding
function, which is a function of the ground
and test device itself, so the cables are not
required to be rated for the available fault
current.
Special attention to cleanliness of the cables
and the condition of the insulation is an
essential requirement for proper use. It is
the user's responsibility to select, provide,
and maintain test cables.
Note: Do not use any cleaning
compounds containing chlorinated
hydrocarbons such as trichlorethylene,
perchlorethylene, or carbon tetrachloride.
These compounds will damage the
phenylene ether copolymer material
used in the barriers and other insulation
on the ground and test device.

9
Cable installation for high-voltage
test probe
1. Remove the outer retaining ring (refer
to Figure 1: Cable installation in test
probes, item 4b on page 10). Do not
remove the inner retaining ring (refer
to Figure 1: Cable installation in test
probes, item 4a on page 10).
2. Remove bayonet (refer to Figure 1: Cable
installation in test probes on page 10,
item 3) from the tube (refer to Figure 1:
Cable installation in test probes, item 2
on page 10) and loosen (do not remove)
two set screws (refer to Figure 1: Cable
installation in test probes, item 5 on
page 10).
3. Insert selected cable (refer to Figure 1:
Cable installation in test probes, item 1
on page 10) completely through tube,
so that it extends out the opposite end
of the tube. Strip the cable and insert
the stripped end into the bayonet
opening to a depth beyond the two set
screws.
4. Securely tighten the two set screws to
firmly retain the cable in the bayonet.
5. Pull the cable and seat the bayonet in
the tube.
6. Reinstall the outer retaining ring and
seat the outer retaining ring in the
groove in the tube (refer to Figure 1:
Cable installation in test probes, item
4b on page 10).
Frame interlocks
Frame interlocks are provided to ensure that
ground and test devices may only enter cells
for which they are intended. Figure 2: Frame
interlock and closed device interlock
location (shown circled) on page 11 shows
the location of the frame interlock and the
closed device interlock.
Special interlock arrangements can be
provided if specified on the order. An
example of a special interlock available is
an interlock to allow use of a device only in
specified cells (for example, in a main circuit
breaker cell). Such special interlocks are
optional and require individual discussion.

10
Figure 1: Cable installation in test probes
Item Description
1Space for user’s cable (not shown)
2Clear tube
3Bayonet (contact)
4Retaining ring (4a - inner, 4b - outer)
5Set screws to secure cable
6Groove engaged by sliding test port slide
4a
3
6
5
1
5
4b
2

11
Figure 2: Frame interlock and closed device interlock location (shown circled)
SAFETY
INSTRUCTIONS
DANGER
WARNING
CAUTION
Selector
switch
USE FOR GROUNDING LOWER STUDS ONLY
Key transfer
interlock
ELEMENTARY
DIAGRAM

12
Figure 3: Closed ground and test device blocking interlock
Partial side view
Device shown CLOSED
Partial side view
Device shown OPEN
Partial front view
Device shown OPEN
Closed ground and test device blocking
interlock
A closed ground and test device blocking
interlock is provided to prevent insertion of
a closed ground and test device into a circuit
breaker cell. This interlock is illustrated in
Figure 3: Closed ground and test device
blocking interlock.
Hazardous voltage and high-speed moving parts.
Can cause death, serious injury and property damage.
Do not bypass or defeat interlocks. Do not disassemble interlocks to make
them inoperative.
Check interlock function prior to inserting ground and test device into
switchgear unit. Read this instruction manual before using ground and
test device. Know and understand correct interlock function.
Item Description
1
Masking plate
(closed device
interlock)
2Frame-size
interlock
3
Circuit breaker
operating
mechanism
1
1
12
3
When the ground and test device is closed,
a linkage connected to the ground and test
device main shaft causes a plate to rotate
downward to "mask" the frame interlock
described in the preceding section of this
instruction manual. The masked frame
interlock blocks entry of the closed ground
and test device into any type GM38 circuit
breaker compartment.

13
Figure 4: Type 38-3AH3-GTD ground and test device type B for grounding lower studs ‒ front view
SAFETY
INSTRUCTIONS
DANGER
WARNING
CAUTION
Selector
switch
USE FOR GROUNDING LOWER STUDS ONLY
ELEMENTARY
DIAGRAM
Item Description
1
Key transfer
interlock
(inside channel)
(not accessible
with device in
CONNECT
position)
2
Upper test ports
and test port
slide
3Test port key
interlock
4Test port
5Remote control
cable receptacle
6
Selector switch
and key interlock
with padlock
provision
7Spring condition
indicator
8
Contact
condition
indicator
9Padlock
provision
10
Frame interlocks
and closed
device interlock
11
Lower test ports
and test port
slide
1
2
9
3
4 4 4
5
7
8
6
11
9
4 4 4
10
Operation -
device types B and D

14
Figure 5: Type 38-3AH3-GTD ground and test device type B for grounding lower studs ‒ side view
Item Description
1Upper test ports
2Upper test well
3Lower test ports
4Lower test well
5Vacuum interrupter
6Upper dummy primary
7Lower conductive primary
4
12
6
7
5
3

15
Figure 6: Type 38-3AH3-GTD ground and test device type D for grounding upper studs ‒ front view
SAFETY
INSTRUCTIONS
DANGER
WARNING
CAUTION
Selector
switch
USE FOR GROUNDING UPPER STUDS ONLY
ELEMENTARY
DIAGRAM
Item Description
1
Key transfer
interlock
(inside channel)
(not accessible
with device in
CONNECT
position)
2
Upper test ports
and test port
slide
3Test port key
interlock
4Test port
5Remote control
cable receptacle
6
Selector switch
and key interlock
with padlock
provision
7Spring condition
indicator
8
Contact
condition
indicator
9Padlock
provision
10
Frame interlocks
and closed
device interlock
11
Lower test ports
and test port
slide
1
2
9
3
44 4
5
7
8
6
11
9
4 4 4
10

16
Figure 7: Type 38-3AH3-GTD ground and test device type D for grounding upper studs ‒ side view
Item Description
1Upper test ports
2Upper test well
3Lower test ports
4Lower test well
5Vacuum interrupter
6Upper dummy primary
7Lower conductive primary
4
1 2
6
7
5
3

17
Elementary diagram
An elementary diagram of the primary
circuit is provided on the front panel of each
ground and test device. This diagram
provides a quick reference to the
arrangement of the device and should be
studied prior to each use to confirm that the
device chosen conforms to the user’s
requirements.
Figure 8: Elementary diagram for
device arranged to ground lower
studs type B
Lower stud
test port
Ground
Grounding
switch
Lower stud
(conductive)
Verify connections of upper studs and lower
studs in the switchgear circuit breaker
compartment. Device type B is designed to
ground lower studs, and device type D is
designed to ground upper studs. Confirm
that the device selected will ground the
desired studs in the switchgear
compartment.
Figure 9: Elementary diagram for
device arranged to ground upper
studs type D
Ground
Grounding
switch
Upper stud
(dummy)
Upper stud
test port
Lower stud
test port Lower stud
(dummy)
Upper stud
(conductive)
Upper stud
test port

18
Key interlock description
Test port interlock:
l Locks test port closed in preparation
for a grounding operation
l Key works in the key transfer interlock.
For device types B and D, the test port key
interlock must be operated as the first step
in preparing the device for a grounding
operation.
This interlock functions to lock closed those
test ports associated with primary
disconnects which are not to be grounded,
and assures that the voltage tests prior to
grounding are made only at the primary
conductors which are to be grounded. This
helps avoid accidental grounding of a live
circuit.
Key transfer interlock:
l The key transfer interlock is not
accessible when the ground and test
device is inside the circuit breaker cell.
l The decision to ground must be made
before inserting the ground and test
device into the circuit breaker cell.
l Accepts key from the test port interlock
to allow removal of the key that works
in the selector switch interlock to
enable the grounding procedure.
The key transfer interlock is positioned on
the top of the ground and test device to
require that the decision to ground or not to
ground be made before the ground and test
device is inserted into the circuit breaker
cell. When the device is in the circuit
breaker cell, the key transfer interlock in not
accessible.
With the ground and test device withdrawn
from the circuit breaker cell, the key transfer
interlock becomes accessible to receive the
key from the closed and locked test port key
interlock. Upon inserting this key and
rotating, the second key in the key transfer
interlock becomes available. This second key
functions in the selector switch to allow
selection of the electrical closing
(grounding) or opening functions.
Selector switch
Off position:
l Control power disconnected
l Padlockable in this position
l Key required from key transfer
interlock to operate
l Trip latch is blocked.
Close position:
l Requires key from key transfer
interlock to switch to CLOSE position
l CLOSE position allows execution of
a remote "close" command
l Trip latch is blocked.
Trip position:
l Requires key from key transfer
interlock to switch to TRIP position
l Trip position allows execution of a
remote "open" command.
Selector switch
The selector switch allows selection of
CLOSE, OFF or TRIP (open) functions.
Mechanically, it blocks the ground and test
device trip latch in the CLOSE and OFF
positions.
Electrically, while in the OFF position, it
removes the spring charge, close and trip
functions from the control circuit. In the
CLOSE position, it enables those portions of
the circuit which support spring charging
and closing (spring release). In the TRIP
position, only the tripping circuit is enabled.
The second key from the key transfer
interlock, when applied in the selector
switch interlock, will free the switch for use.
The selector switch is locked by the key in
the OFF position, and may be padlocked in
this position as well.

19
Electrical operation is performed using a
remote CLOSE-OPEN pushbutton station at
the end of a long cable. The remote CLOSE-
OPEN pushbutton station cable should be
extended to its full length off to the side of
the cell before grounding operations are
attempted. All observers should stand near
the pushbutton operator, and not in front of
the cell being grounded.
Hazardous voltage and high currents.
Can cause death, serious injury and property damage.
Extend the control cable to its full length.
Use the CLOSE-OPEN pushbutton control station as far from the switch-
gear compartment to be grounded as possible and off to the side rather
than in the front.
Make sure that no person is in the area in front of the switchgear
compartment to be grounded.
Hazardous voltage and high currents.
Can cause death, serious injury and property damage.
Read and understand this instruction manual before each use of this
ground and test device.
Operate ground and test device outside switchgear unit and confirm
desired operation before inserting ground and test device into
switchgear unit.
Restrict use to qualified persons.

20
Operating instructions overview
The ground and test device provides user
access to the primary terminals of the
switchgear equipment. These terminals may
be energized at system voltage and will
deliver maximum system fault (short-circuit)
current. No attempt to operate the ground
and test device should be made without
thoroughly reading and understanding this
instruction manual. Operate the ground and
test device outside of the switchgear unit
and confirm that the sequence of operation
will meet the desired intent before inserting
the ground and test device into the
switchgear unit.
These instructions have been prepared to
enhance operator understanding of the
ground and test device and to suggest one
possible sequence of operation. These
instructions include information on:
lA1. Operational checkout of the ground
and test device.
lA2. System test procedures.
A1. Operational checkout of the ground
and test device
A1.1 These procedures should be
performed as a prerequisite to
each use of the ground and test
device, to verify that the device is
in acceptable operating condition
and to familiarize the user with the
equipment. These operational
checks should be performed with
the ground and test device
withdrawn completely from the
switchgear unit and in an area of
sufficient size to facilitate the
inspection of the device from any
direction. Reference to Table 1:
Type 38-3AH3-GTD ground and
test device types on page 7,
Figures 4-7 and the ground and
test device elementary diagram
Figure 8: Elementary diagram for
device arranged to ground lower
studs type B on page 17 or Figure
9: Elementary diagram for device
arranged to ground upper studs
type D on page 17 (for device
arranged to ground the upper
studs) will aid understanding.
A1.2 The following should be available:
A1.2.1 Ground and test device appropriate
to the studs (upper or lower) which
are to be grounded.
A1.2.2 Remote close-trip pushbutton
control station, consisting of two
normally open pushbuttons and a
long control cable terminated with
plug.
A1.2.3 Suitable voltage source to charge,
close and trip (open) the ground
and test device. Voltage must
match the control voltage indicated
on the device rating plate located
on the front of the ground and test
device.
A1.2.4 Confirm that the correct ground
and test device has been selected
for use. Check the position of the
conductive copper primary studs
and the location of the key lockable
test port slide, compare to the
device elementary diagram and
compare to the switchgear
drawings. If the device has only
one set of primary disconnects
(upper or lower, but not both),
refer to the operation - devices
types E and F instructions.
A1.2.5 Check that the elementary diagram
label on the front of the ground
and test device agrees with the
observed data from step A1.2.4
above and that the device selected
will ground the desired studs in the
switchgear compartment. Compare
findings to Table 1: Type 38-3AH3-
GTD ground and test device types
on page 7 and the discussion of
device types earlier in this
instruction manual.
A1.3 Interlock function. Key interlocks
are provided to enable and control
grounding procedures. For the
purpose of the operational check
procedure, the device is assumed to
be in the "as found" (initial)
condition of the interlocks is
defined as: