GE AKD-20 AR Manual

GE
Industrial Solutions
DEH-41473 Installation and Maintenance Manual
AKD-20 AR / Entellisys AR
Low-voltage Switchgear
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© 2016 General Electric. All rights reserved. i
Table of Contents
General Information ................................................................... iii
Hazard Classifications .............................................................................iii
Trademarks................................................................................... iii
Warranty .............................................................................iii
Section 1. Introduction ................................................................1
General Information.................................................................................. 1
Instruction Manual Arrangement....................................................... 1
Section 1, Introduction....................................................................... 1
Section 2, Receiving, Handling, and Storage.......................... 1
Section 3, Switchgear Description...............................................1
Section 4, Equipment Installation.................................................1
Section 5, Exhaust Plenum Installation.....................................1
Section 6, Installing and Removing Circuit Breakers ......... 1
Section 7, Testing and Inspecting ................................................ 1
Section 8, Operating the Switchgear..........................................2
Section 9, Energizing the Switchgear......................................... 2
Section 10, Maintaining the Switchgear................................... 2
Section 11, Common Switchgear Accessories and Kits... 2
Appendices A, B, C, D, E, F, and G .................................................2
Related Publications..................................................................................2
General Arrangement Drawings................................................... 2
Elementary and Connection Drawings ..................................... 2
Summary of Switchgear Equipment........................................... 2
Section 2. Receiving, Handling, and Storage...........................3
Receiving .........................................................................................................3
Equipment Packaging ........................................................................ 3
Inspecting for Damage......................................................................3
Filing a Claim...........................................................................................3
Handling ..........................................................................................................4
Indoor Enclosure Lifting.....................................................................4
Rollers..........................................................................................................5
Forklifts....................................................................................................... 5
Storage............................................................................................................. 6
Switchgear ...............................................................................................6
Circuit Breakers...................................................................................... 6
Exhaust Plenum Components........................................................6
Section 3. Switchgear Description ............................................7
General.............................................................................................................7
Summary Description............................................................................... 8
Front Compartments ............................................................................. 10
Instrument Panel (AKD-20 AR Only) ......................................... 10
Circuit Breaker Control Fuse Panel (Entellisys AR Only) . 10
EntelliGuard Messenger (Entellisys AR Only)........................ 10
Instrument/Auxiliary Compartment......................................... 10
Entellisys Instrument/Auxiliary Compartment (Entellisys
AR Only) ................................................................................................... 11
Auxiliary/Transition Sections ....................................................... 11
Circuit Breaker Compartments......................................................... 12
Primary Disconnect Shutter ......................................................... 14
Breaker Compartment Door ........................................................ 15
Future Circuit Breaker Compartment ..................................... 15
Circuit Breakers......................................................................................... 16
Bus Area........................................................................................................ 17
Busing System..................................................................................... 17
Insulated/Isolated Bus System ................................................... 18
Cable Compartment ...............................................................................19
Cable Compartment Floor Plates...............................................19
Ground Bus ............................................................................................20
Heaters.....................................................................................................20
Section 4. Equipment Installation ...........................................21
General...........................................................................................................21
Site Location................................................................................................21
Foundation Requirements...................................................................21
Foundation Preparation........................................................................22
Indoor Equipment...............................................................................22
Assembly and Installation of Switchgear ....................................25
General.....................................................................................................25
Detailed Assembly and Installation Instructions ...............25
Switchgear Anchoring .....................................................................29
External Control Wire Connections...........................................30
Power Cable Connections..............................................................31
Relay and Control Devices.............................................................31
Breaker Lifting Device ............................................................................32
Indoor Equipment...............................................................................32
Rear Door Ventilation .............................................................................35
Wall Mounted HMI (Entellisys AR Only)..........................................36
General.....................................................................................................36
Installation..............................................................................................36
Wiring........................................................................................................36
Section 5. Exhaust Plenum Installation..................................37
General...........................................................................................................37
Installation....................................................................................................38
Exhaust Plenum above Switchgear..........................................38
Exhaust Plenum End Cap ...............................................................40
Exhaust Plenum End Portal...........................................................40
Plenum System between Equipment and End Portal .....41
Section 6. Installing and Removing Circuit Breakers ..........42
General...........................................................................................................42
Circuit Breaker Identification..............................................................42
Rejection Feature......................................................................................42
Installing a Circuit Breaker...................................................................43
General.....................................................................................................43
Installation Procedure......................................................................43
Removing a Circuit Breaker ................................................................45
Section 7. Testing and Inspecting ...........................................46
General...........................................................................................................46
Key Interlocks .............................................................................................46
Breaker Operation Test .........................................................................46
EntelliGuard Trip Units (AKD-20 AR Only) ...............................46
Entellisys System Test Kit (Entellisys AR Only)......................47
Final Steps to be taken Before Energizing Equipment..........47
Section 8. Operating the Switchgear......................................48
General...........................................................................................................48
Manually Operated Circuit Breakers ..............................................48
Closing Operation...............................................................................48
Opening Operation ............................................................................48
Electrically Operated Circuit Breakers...........................................48
Closing Operation...............................................................................48
Opening Operation ............................................................................48
Circuit Breaker Draw-out Operation ..............................................49
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CONNECTED Position ....................................................................... 49
TEST Position ........................................................................................ 49
DISCONNECTED Position................................................................ 49
WITHDRAWN Position...................................................................... 49
Draw-out Operation ......................................................................... 49
Front Doors ................................................................................................. 50
Front Door Removal and Installation ...................................... 51
Future Circuit Breaker Compartments ......................................... 52
Circuit Breaker Compartment Features....................................... 53
Key Interlocks....................................................................................... 53
Padlocking Features......................................................................... 54
Cooling Fan Control Module............................................................... 55
General.................................................................................................... 55
Operation ............................................................................................... 57
Rear Access Doors .................................................................................. 58
Section 9. Energizing the Switchgear .....................................59
Before Energizing..................................................................................... 59
Energizing Procedures .......................................................................... 59
Section 10. Maintaining the Switchgear ................................60
General.......................................................................................................... 60
Circuit Breaker and Instrument Compartments...................... 60
Circuit Breaker..................................................................................... 60
Bus Area........................................................................................................ 62
Circuit Breaker Lifting Mechanism.................................................. 62
Overall Switchgear.................................................................................. 62
Paint Refinishing....................................................................................... 62
Section 11. Common Switchgear Accessories and Kits.......63
Appendix A. Torque Values .......................................................65
Appendix B. Circuit Breaker Rejection Feature.....................66
General.......................................................................................................... 66
Rejection Feature..................................................................................... 66
Appendix C. EntelliGuard G Rejection Features (AKD-20 AR
Only) ............................................................................67
Envelope 1 Rejection Features ......................................................... 67
Envelope 2 Rejection Features ......................................................... 68
Envelope 3 Rejection Features ......................................................... 70
Appendix D. EntelliGuard E Rejection Features (Entellisys AR
Only) ............................................................................72
Envelope 1 Rejection Features ......................................................... 72
Envelope 2 Rejection Features ......................................................... 73
Envelope 3 Rejection Features ......................................................... 74
Appendix E. Circuit Breaker Information ...............................75
Appendix F. Exhaust Plenum Details.......................................76
General.......................................................................................................... 76
Exhaust Plenum Section....................................................................... 78
Exhaust Plenum T-Section .................................................................. 79
Exhaust Plenum V-Section.................................................................. 80
Exhaust Plenum Transition Adapter .............................................. 81
Exhaust Plenum End Cap..................................................................... 82
Exhaust Plenum End Portal ................................................................ 83
Exhaust Plenum Access Cover.......................................................... 84
Exhaust Plenum Extension ................................................................. 85
Exhaust Plenum 90 Degree Vertical Elbow................................ 86
Exhaust Plenum 90 Degree Horizontal Elbow.......................... 87
Exhaust Plenum Flange Clip............................................................... 88
Appendix G. Notes ......................................................................89
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© 2016 General Electric. All rights reserved. iii
General Information
Hazard Classifications
The following important highlighted information appears
throughout this document to warn of potential hazards or to
call attention to information that clarifies a procedure.
Carefully read all instructions and become familiar with the
devices before trying to install, operate, service or maintain
this equipment.
DANGER: Indicates a hazardous situation which, if not
avoided, will result in death or serious injury.
WARNING: Indicates a hazardous situation which, if not
avoided, will result in death or serious injury.
CAUTION: Indicates that if the hazard is not avoided
could result in minor or moderate injury.
NOTICE: Is used to notify of practices not related to
personal injury.
Trademarks
Entellisys*
EntelliGuard* G
EntelliGuard* E
EntelliGuard* TU
Arc Vault* Protection System
Warranty
This document is based on information available at the time
of its publication. While efforts have been made to ensure
accuracy, the information contained herein does not cover all
details or variations in hardware and software, nor does it
provide for every possible contingency in connection with
installation, operation, and maintenance. Features may be
described herein that are not present in all hardware and
software systems. GE Industrial Solutions assumes no
obligation of notice to holders of this document with respect
to changes subsequently made. GE Industrial Solutions
makes no representation or warranty, expressed, implied, or
statutory, with respect to, and assumes no responsibility for
the accuracy, completeness, sufficiency, or usefulness of the
information contained herein. No warrantees of
merchantability or fitness for purpose shall apply.
Contact your local sales office if further information is
required concerning any aspect of AKD-20 AR or Entellisys AR
switchgear and EntelliGuard G or EntelliGuard E breaker
operation or maintenance.
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 1. Introduction
1 ©2016 General Electric. All rights reserved.
Section 1. Introduction
General Information
NOTICE: These instructions convey information that pertain
to both AKD-20 AR and Entellisys AR low-voltage
switchgear products. Information that is applicable only to
AKD-20 AR will be marked as (AKD-20 AR Only) and
information that is applicable to Entellisys AR will be
marked as (Entellisys AR Only). Unless marked otherwise,
information provided in this document is applicable to both
products.
NOTICE: 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 the
installation, operation or maintenance. Should further
information be desired or should particular problems arise
which are not covered sufficiently for the purposes, the
matter should be referred to the General Electric Company.
These instructions are intended for use by qualified
personnel only.
This manual contains procedures for receiving, handling,
storage, installation, operation, maintenance, and service of
AKD-20 AR and Entellisys AR low-voltage switchgear.
NOTICE: The personnel responsible for installing, operating,
and servicing this equipment should be thoroughly familiar
with the contents of this manual.
Before any installation work is performed, thoroughly read
and understand the material in this instruction manual and
the drawings furnished with the equipment. The
documentation shipped with the equipment includes the
Summary, Front View, Elementary Diagram, Connection
Diagram and Instruction Books. This material is located in a
forward compartment tagged "INSTRUCTIONS IN THIS
COMPARTMENT." The documentation provides all of the
information necessary for installation of the switchgear.
When requesting information from the General Electric
Company, include the complete data appearing on the
equipment nameplate, requisition number, summary number,
and elementary diagram number. The nameplate is located
in the lower left, front corner of the lineup.
When requesting information concerning any specific item
furnished with the switchgear, refer to that item by
description, part number, its location within this manual, and
any applicable drawing number. Any material external to the
equipment, which may be required to meet local codes (such
as mats, screens, railings, etc.), is not furnished by the General
Electric Company.
If there are any questions or requirements not covered in this
manual or in the accompanying drawings, please contact the
local sales office of the General Electric Company.
Instruction Manual Arrangement
Information and procedures in this instruction manual are
divided into sections as follows:
Section 1, Introduction
Gives a brief account of the equipment’s function and
provides for general information, and applicable data for the
equipment and its components.
Section 2, Receiving, Handling, and Storage
Describes procedures required for receiving and handling the
equipment and how to prepare it for short- or long-term
storage.
Section 3, Switchgear Description
Describes the AKD-20 AR and Entellisys AR low-voltage
switchgear and its various components. Included are the
section enclosure, breaker compartments, circuit breakers,
instrument panels and instrument compartments, bus bar
arrangement, incoming cable, ground and neutral bus, and
auxiliary sections. This section also explains how the
electrical and mechanical components perform their
assigned functions.
Section 4, Equipment Installation
Provides the information needed prior to installation, site
location and foundation requirements, and how to anchor the
equipment properly and safely. It also covers installation of
peripheral equipment and includes information on electrical
connections and mechanical construction.
Section 5, Exhaust Plenum Installation
Describes the procedure for installing the exhaust plenum
across the top of the switchgear and provides details for
assembly of the end of the plenum exhaust system.
Section 6, Installing and Removing Circuit
Breakers
Gives a step-by-step procedure for lifting the breaker from
the floor, installing it on draw-out rails, and moving it into the
connected position. A further procedure is given to withdraw
a breaker, remove it from the draw-out rails, and lower it to
the floor. Also included is a description of the rejection
system provided to avoid the inadvertent use of an incorrect
breaker in a breaker compartment.
Section 7, Testing and Inspecting
Reviews items which should be tested or inspected prior to
energizing and operating the switchgear.
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DEH-41473 AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 1. Introduction
©2016 General Electric. All rights reserved. 2
Section 8, Operating the Switchgear
Covers how to operate the circuit breaker, and contains
information concerning draw-out provisions, doors, and
various accessories.
Section 9, Energizing the Switchgear
Outlines the steps to be taken before and during the electrical
energization of the equipment.
Section 10, Maintaining the Switchgear
Provides instructions for all preventive maintenance,
servicing, and lubrication information for the switchgear
equipment. Included is service and maintenance data for the
circuit breakers, instrument compartments, instruments, bus
bar joints, and cable connections. This section also includes
paint refinishing requirements.
Section 11, Common Switchgear Accessories and
Kits
Outlines a listing of common accessory and kit items
available from the factory.
Appendices A, B, C, D, E, F, and G
Contains information concerning screw and bolt torque
values, circuit breaker rejection features, circuit breaker
information, exhaust plenum system component details, and
a open space for taking notes.
Related Publications
Addendum’s to this instruction manual are the available
service and maintenance publications supplied separately for
circuit breakers, relays and other devices not described in this
instruction manual.
In addition to instruction manuals, the following drawings will
be supplied as required for each order of AKD-20 AR and
Entellisys AR switchgear equipment.
These are all the documents necessary to install, operate, and
maintain the equipment. One complete set of drawings and
instruction manuals is shipped with the equipment.
General Arrangement Drawings
Drawings which Include front view and floor plan details.
Elementary and Connection Drawings
Drawings (or wiring routing tables) which indicate and identify
test and connection points including terminal blocks, device
studs, switch contact developments, and remote connections.
Summary of Switchgear Equipment
Documents which list of all the components furnished with
the switchgear, including the breakers, identified by catalog
number.
Figure 1.1 AKD-20 AR low-voltage switchgear
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 2. Receiving, Handling, and Storage
3 ©2016 General Electric. All rights reserved.
Section 2. Receiving, Handling, and Storage
Receiving
Equipment Packaging
Every package leaving the factory is plainly marked with the
case number, requisition number, and customer's order
number. If the equipment has been split for shipment, the
section numbers of the equipment enclosed in each shipping
package are identified.
NOTICE: To avoid the loss of any parts when unpacking,
the contents of each container should be carefully checked
against the packing list before discarding the packing
material.
The contents of each shipping package are listed on the
Master Packing List. In addition, this list includes the number
of the shipping crate in which miscellaneous parts needed to
install and operate the equipment (such as hardware, contact
lubricant, touch-up paint, breaker closing devices, etc.) are
located. Normally, such devices are packed in a cardboard
carton and the carton secured in an empty switchgear
compartment (Figure 2.1). If such items are packed in a
switchgear section instead of a separate crate, the list will
indicate the appropriate section number in which they are
stored. Large items (such as breaker lifting devices and
dollies used with indoor equipment) will always be shipped in
separate crates or cartons (Figure 2.2 and Figure 2.3).
Inspecting for Damage
All equipment leaving the factory is carefully inspected and
packed by personnel experienced in the proper handling and
packing of electrical equipment. Upon receipt of any
equipment, immediately perform a visual inspection to
ascertain if any damage has been sustained in shipping or if
there are any loose parts.
Circuit breakers may be shipped separately in individual
containers with the breaker in the open position. Circuit
breakers should be unpacked and visually inspected for
damage or loose parts as soon as possible after they have
been received.
Be sure to inspect all devices mounted or packed inside
compartments of each section to see if any have been
dislodged or damaged.
Filing a Claim
If any damage is evident, or indication of rough handling is
visible, file a claim for damage at once with the transportation
company and notify the nearest General Electric Company
Sales Office immediately. Information on damaged parts,
part number, case number, requisition number, etc., should
accompany the claim.
Figure 2.1 Packaging of loose material for shipment
(1) Spare Compartment
(2) Carton Containing Loose Material
(3) Shipping Label Listing Contents of Carton
Figure 2.2 Carton containing breaker lifting device
Figure 2.3 Carton containing exhaust plenum components
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DEH-41473 AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 2. Receiving, Handling, and Storage
©2016 General Electric. All rights reserved. 4
Handling
NOTICE: It is preferable to leave the shipping skids in place
under the switchgear until it reaches its final location. The
equipment should be installed in its final location prior to
installing the circuit breakers.
Indoor Enclosure Lifting
The indoor switchgear sections are best handled by lifting
with a crane (Figure 2.4). Removable lifting plates are
provided, as standard equipment, on the top of each
switchgear section. To preserve the external appearance of
the equipment, it is suggested that the lifting plates be left in
place except where adjacent equipment must be bolted
together, i.e. shipping splits, etc.
Utilize four equal length cables and an overhead crane, each
with a minimum load rating of twice the weight of the
switchgear.
Estimated weights for shipping splits appear on the Front
View drawings.
Example: Switchgear Section Weight = 5,000 pounds. The
crane and the four lift cables must have a minimum load
lifting capacity of 10,000 pounds.
WARNING: The angle between the cables and the top
of the equipment must be at least 45 degrees. If this is not
possible because of lack of headspace, spreader bars must
be used. Also, lift cables with greater load capability may
be necessary, depending upon the angle between the
cables and the crane hook.
Connect a cable from the crane to the four lifting plates
located on the top-front and rear of the switchgear (Figure
2.4).
Take up the slack in the lifting device very carefully and
manually stabilize the switchgear to prevent it from rotating.
DANGER: Do not stand under switchgear while it is
being moved. Serious injury may occur if the cables or
lifting device fail.
CAUTION: Gently lower the switchgear section onto the
level site location. If the switchgear is roughly handled or
jarred, it is possible to damage or misalign internal
components.
WARNING: Be sure to remove all circuit breakers from
their compartments prior to lifting. Failure to remove the
circuit breakers prior to lifting will result in a center of
gravity toward the front of the switchgear assembly and
may require additional rigging and stabilization.
Figure 2.4 Recommended lifting of indoor enclosure
WARNING LABEL BY EACH LIFTING PLATE
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 2. Receiving, Handling, and Storage
5 ©2016 General Electric. All rights reserved.
Rollers
If crane facilities are not available, the equipment may be
moved into position by means of construction rollers placed
under the shipping skids. The switchgear may be raised
enough for the placement of rollers by means of a forklift.
There should never be less than four rollers under the
equipment unless the lineup is less than five feet long. Use
one roller for each 18 inches of equipment length.
Forklifts
When using a forklift to raise the lineup to position rollers
underneath, proceed as follows:
1. Expand forklift tines to their maximum (widest)
extension.
2. Carefully insert tines of forklift below one side of the
switchgear lineup at the approximate center of the
panel. Raise equipment and position one roller under
the skids close to the raised end of the lineup (Figure
2.5).
3. Carefully lower the gear until it rests on the roller
(Figure 2.6).
4. Repeat the lifting process at the other end and place
the appropriate number of rollers under the skids
spacing them evenly across the width of the lineup
(Figure 2.7).
5. Carefully lower the gear until it rests on the roller
(Figure 2.6).
6. While carefully pushing the switchgear to its final site
position, the rollers that are freed from the rear of the
switchgear are then repositioned at the forward end.
This procedure should be continued until the
switchgear is in its final location (Figure 2.7).
7. When the switchgear is in its final position, remove all
lug bolts holding the shipping skids to the switchgear
lineup.
8. Insert the tines of the forklift at one end of the lineup,
raise slightly, and remove the loose rollers.
9. Lower the end of the gear carefully to the floor.
10. Raise the other end of the lineup slightly and remove
the remaining roller at that end.
CAUTION: Do not attempt to lift or move the equipment
with a forklift positioned in the front or rear of the
equipment. It is possible to damage internal components
and/or the shipping skid.
NOTICE: If the shipping skids are removed prior to final
placement of the equipment, rollers may only be used to
move the equipment in a direction parallel to the front.
Figure 2.5 Positioning forklift tines
Figure 2.6 Placement of construction rollers
Figure 2.7 Method of rolling equipment
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DEH-41473 AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 2. Receiving, Handling, and Storage
©2016 General Electric. All rights reserved. 6
Storage
Switchgear
If it is necessary to store the switchgear equipment for any
length of time, the following precautions should be taken to
prevent corrosion or deterioration.
1. Remove protective covering. Check thoroughly for
damage.
2. Store in a clean, dry, rodent-free location with
moderate temperature and provide coverings to
prevent dirt, water, or other foreign substances from
entering the switchgear.
3. If dampness or condensation may be encountered in
the storage location, heaters must be placed inside
the switchgear sections to prevent moisture damage.
Approximately 250 watts of heat in each section is
required. On outdoor switchgear equipment, this
may be accomplished by making a temporary power
supply connection to the heaters already installed in
the equipment. On indoor switchgear, factory
installed heaters are available as an option.
4. If the switchgear is to be used with an external
exhaust plenum system, be sure that the factory
installed temporary covers are in place for storage.
Equipment shipped from the factory without the
external exhaust plenum will have covers located on
each vertical section on the top of the plenum flange
assembly (Figure 2.8).
CAUTION: Remove all cartons, containers and any
other miscellaneous packaging and packing material from
inside the switchgear sections before energizing any
internal heaters. To prevent fire, remove any plastic or
polyethylene shrouding from the switchgear sections
before energizing any internal heaters.
CAUTION: If the space heaters are to be temporarily
energized from an external source, it is important to
remove the fuses on the secondary side of the control
power transformer. This precaution is to prevent a
feedback of higher voltage to other portions of the
equipment through the control power transformer primary
circuit.
Circuit Breakers
If circuit breakers are not to be placed into service at once,
remove them from their shipping cartons and thoroughly
inspect them for damage. If the breakers are in satisfactory
condition, replace the breakers in their shipping cartons for
storage. Do not remove the circuit breaker shipping members
at this time.
Store the circuit breakers in a clean, dry location in an upright
position. They must be properly supported to prevent
bending of the studs or damage to any of the breaker parts.
Do not remove any protective grease until the circuit breakers
are ready to be installed. A plastic or canvas-type cover
should be provided to reduce the possibility of damage to the
breakers due to dust and water.
Exhaust Plenum Components
If it is necessary to store the exhaust plenum system for any
length of time, the following precautions should be taken to
prevent corrosion or deterioration.
1. Remove protective covering. Check thoroughly for
damage.
2. Store in a clean, dry, rodent-free location with
moderate temperature and provide coverings to
prevent dirt, water, or other foreign substances from
entering the individual components.
Figure 2.8 Plenum flange temporary cover
(1) Temporary Cover
(2) ¼-20 x ½ inch Thread Rolling Screws
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 3. Switchgear Description
7 ©2016 General Electric. All rights reserved.
Section 3. Switchgear Description
General
This section contains a description of the General Electric low-
voltage switchgear. It also describes the functions of the
electrical and mechanical systems.
Figure 3.1 is a side view of a typical section showing
compartmentation.
Compartmentation is identical for Entellisys AR equipment
with the exception that an Entellisys Messenger is provided in
lieu of an Instrument Panel for each breaker compartment.
Figure 3.1 Side view section of AKD-20 AR low-voltage switchgear
EXTERNAL
EXHAUST PLENUM
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DEH-41473 AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 3. Switchgear Description
©2016 General Electric. All rights reserved. 8
Summary Description
General Electric low-voltage switchgear is a freestanding
assembly of metal-enclosed sections containing low-voltage
power circuit breakers, bus bars, cable termination provisions,
auxiliary power circuit protective devices, controls, and
instrumentation.
All of the primary circuit switching and protective devices,
secondary control and metering devices, control fuses,
instrument transformers, and instrumentation are mounted in
the enclosure.
The minimum ceiling space required for an assembly of arc
resistant low-voltage switchgear is 10 feet from the base of
the assembly.
The breaker compartments include draw-out rails, stationary
breaker contacts, interlocks, and necessary control and
indicating devices. The breakers are provided with self-
aligning primary and secondary disconnecting contacts,
breaker locking mechanism, and integral trip unit. The
individual sections, compartments, and devices are described
in the following paragraphs. Figure 3.2 and Figure 3.3 provide
an outline of a typical single-ended load center illustrating the
nomenclature used for all equipment.
Figure 3.2 Outline of typical arc resistant low-voltage switchgear (front view)
(1) Exhaust Plenum Section, 38” Stack
(2) Exhaust Plenum Section, 30” Stack
(3) Exhaust Plenum Section, 22” Stack
(4) Transition Adaptor Section (Typical)
(5) End Cap
(6) Exhaust Plenum End Portal
(7) Exhaust Plenum Access Cover (Typical)
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 3. Switchgear Description
9 ©2016 General Electric. All rights reserved.
Figure 3.3 Outline of typical arc resistant low-voltage switchgear (side view)
(1) Front Compartments & Breaker Compartments
(2) Bus and Cable Compartment
(3) Plenum Flange
(4) Exhaust Plenum System
Table 3.1 Arc resistant low-voltage switchgear assembly depths
Dimension
Depth (inches)
C
24.74
30.74
37.74
44.74
D
54
60
67
74
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DEH-41473 AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 3. Switchgear Description
©2016 General Electric. All rights reserved. 10
Front Compartments
The front enclosure of each section is divided into individual
compartments. These compartments house either a low-
voltage power circuit breaker or are used to mount
instruments, control components and other ancillary devices.
Instrument Panel (AKD-20 AR Only)
A standard instrument panel is located above each breaker
compartment eliminating cross-hinge wiring (Figure 3.4).
When required, optional devices may be included and
mounted on the front face of the panel such as breaker
control circuit fuses, pilot lights, and a RELT switch.
Fuses for the charge, close, and trip circuits of the electrically
operated EntelliGuard G breakers are mounted on the panel.
Routine wiring inspections and fuse checks or fuse
replacements can be performed with the breaker
compartment door in the closed position so that operators
are protected from the energized primary circuits.
Circuit Breaker Control Fuse Panel (Entellisys AR
Only)
Control fuses for the charge, close, and trip circuit of
electrically operated EntelliGuard E circuit breakers are
located on the lower left panel of the circuit breaker
escutcheon cover (Figure 3.5). Control fuses for the SET and
RESET coils of the optional Network Interlock accessory are
located similarly.
EntelliGuard Messenger (Entellisys AR Only)
An EntelliGuard Messenger is located above each breaker
compartment (Figure 3.6). The Messenger provides an
interface between the circuit breaker, the breaker
compartment, and the Entellisys system. For additional
information and instructions, reference DEH-501.
Instrument/Auxiliary Compartment
An instrument/auxiliary compartment is available as a
standard feature (Figure 3.7).
Relays, fuse cutouts, and similar devices may be installed in
the instrument compartment or in adjacent compartments.
CAUTION: The instrument/auxiliary compartment may
contain devices that operate at a variety of different
control voltages including both primary and secondary
sources. Review all equipment drawings, elementary,
remote connection drawings and the summary of
equipment prior to working inside.
Figure 3.4 AKD-20 AR instrument panel
(1) Circuit Breaker Control Fuses
(2) RELT Switch & Indicator
(3) Pilot Indicating Lights
Figure 3.5 Entellisys AR circuit breaker fuse panel
Figure 3.6 EntelliGuard messenger
Figure 3.7 Instrument/auxiliary compartment
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 3. Switchgear Description
11 ©2016 General Electric. All rights reserved.
Entellisys Instrument/Auxiliary Compartment
(Entellisys AR Only)
Each Entellisys AR low-voltage switchgear lineup contains
standard devices housed within the instrument
compartments (Figure 3.8). Two CPUs (Central Processing
Units) provide the processing capability to support all
switchgear functions. At least one HMI (Human-Machine
Interface) provides user access to the Entellisys system.
Network switches provide communication links between the
CPU, the HMI, the EntelliGuard Messengers, and the external
world. A pair of uninterruptible power supplies (UPS’s) and
control power throw-over relays supply highly reliable control
power to these system devices. For additional information
and instructions, reference DEH-501.
CAUTION: The instrument/auxiliary compartment may
contain devices that operate at a variety of different
control voltages including both primary and secondary
sources. Review all equipment drawings, elementary,
remote connection drawings and the summary of
equipment prior to working inside.
Auxiliary/Transition Sections
Sections may be provided for any one or more of several
reasons including:
•Incoming cable when a main breaker section is not
provided
•Mounting and wiring of additional metering, relaying,
and control devices requiring more space than
available in a standard instrument panel or
instrumentation compartment (transition or auxiliary)
•Mounting and wiring of purchaser specified and/or
furnished devices.
Auxiliary sections may be 22-inch, 30-inch, or 38-inch wide as
required to accommodate the space requirements. The
compartment doors on the front of the sections are hinged
and latched in the same manner as breaker compartment
doors.
Figure 3.9 is a front view of a typical instrumentation
compartment.
Figure 3.10 shows examples of primary and secondary
control protection in the instrument compartment.
CAUTION: The instrument/transition compartment may
contain devices that operate at a variety of different
control voltages including both primary and secondary
sources. Review all equipment drawings, elementary,
remote connection drawings and the summary of
equipment prior to working inside.
Figure 3.8 Entellisys instrument/auxiliary compartment
(1) CPU’s (Central Processing Units)
(2) Firewall Security Device
(3) Network Switches
(4) HMI (Human Machine Interface)
Figure 3.9 Auxiliary/transition section
(1) 24V Power Supply
(2) Auxiliary Summing CT
(3) Voltage Conditioners
Figure 3.10 Primary and secondary fusing
(1) Enclosed Fuse Block (Primary Circuits)
(2) Open Fuse Block (Secondary Circuits)
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DEH-41473 AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 3. Switchgear Description
©2016 General Electric. All rights reserved. 12
Circuit Breaker Compartments
DANGER: Electrical arc flash hazard. Personal
protection equipment required. Turn off power to the
equipment before working inside.
Closed door draw-out circuit breaker compartments are
standard construction with all switchgear equipment (Figure
3.12). The circuit breaker compartment doors remain closed
and latched while the breaker is racked out from the
CONNECTED position, through TEST, to the DISCONNECTED
position.
Breaker compartment doors do not have any ventilation slots,
thus protecting operators from hot ionized gases which may
be vented by the breaker during circuit interruption.
Additionally, the breaker compartment is enclosed by
grounded steel barriers on the top, sides, bottom, and front
(Figure 3.13 and Figure 3.14). In the back, a flame-retardant,
track resistant, glass-filled polyester base minimizes the
possibility of fault communication between compartments or
to the bus.
A circuit breaker racking handle is provided in the right most
pocket of the breaker compartment fascia (Figure 3.11).
Up to two key interlocks may be provided in the breaker
compartment fascia (Figure 3.12). If the application does not
require a key interlock(s), metallic key interlock plug(s), GE
#GM2KIP, are provided.
WARNING: The EntelliGuard racking handle must be
returned to its compartment to maintain the integrity of the
arc resistant enclosure.
WARNING: Either the key interlock(s) or the metallic key
interlock plug must be installed to maintain the integrity of
the arc resistant enclosure.
An optional position switch may be provided in the left side
frame of the circuit breaker compartment (Figure 3.14). If the
application does not require a position switch, a metallic
position switch cover, GE #GM2PSC, is provided.
WARNING: Either the position switch or the metallic
position switch cover must be installed to maintain the
integrity of the arc resistant enclosure.
Figure 3.11 EntelliGuard racking handle
(1) EntelliGuard Racking Handle
Figure 3.12 EntelliGuard breaker compartment fascia
(1) Circuit Breaker Door and Gasket
(2) Breaker Position Indicator
(3) Key Interlocks (Optional)
(4) Access Port to Racking Mechanism
(5) Racking Handle
Figure 3.13 EntelliGuard circuit breaker compartment
(1) Cassette Side Barrier
(2) Racking Arm
(3) Cassette Bottom and Racking Box
(4) Draw-out Rails
Figure 3.14 EntelliGuard circuit breaker compartment
(1) Secondary Disconnects (Optional)
(2) Position Switch Location (Pos. Switch not Shown)
(3) Primary Disconnect Stab Tip (Typical)
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 3. Switchgear Description
13 ©2016 General Electric. All rights reserved.
Installing and removing of the circuit breaker from the
compartment is covered in SECTION 6 of this instruction
manual.
WARNING: The breaker compartment door must be
closed and latched to maintain the integrity of the arc
resistant enclosure. The breaker compartment door should
not be opened when the circuit breaker is closed and in the
connected position when the equipment is energized.
The racking arm (Figure 3.13) engages fixed racking anchor
pins on the sides of the circuit breaker. As the racking arms
are rotated by the operation of the racking handle (Figure
3.12), the circuit breaker is pulled into or out of the
compartment, and locked in its final position.
The circuit breaker should always be OPEN when it is moved
into or out of the CONNECTED position. As a safeguard, a
draw-out interlock will prevent access to the racking
mechanism unless the circuit breaker is OPEN.
Each circuit breaker compartment has four positions as
described in Table 3.2.
Movement of the breaker between the CONNECTED, TEST,
and DISCONNECTED positions is performed by the use of a
racking handle (Figure 3.12) which engages the racking
mechanism mounted on the cassette. An optional remote
racking device is also available. Movement to the
WITHDRAWN position is manually performed after opening
the compartment door. These positions are illustrated and
described more fully in SECTION 6 of this manual.
All EntelliGuard circuit breakers are provided with a factory
installed mechanical rejection feature. See SECTION 6 of this
manual for additional details.
Depending on the equipment specified, items such as position
switch, key interlock(s) and secondary disconnects are
optional and may appear in any compartment or not be
included at all.
Although the breaker compartment door may be opened in
any position, it is recommended that the door only be opened
when the breaker is in the DISCONNECTED or WITHDRAWN
position.
Table 3.2 Circuit breaker positions
Circuit Breaker
Position
Primary
Disconnects
Secondary
Disconnects
Shutter
Assembly
Circuit Breaker
Door
Circuit Breaker Functionality
CONNECTED Engaged Engaged Opened Closed
Can be operated mechanically or electrically.
Ready for serving intended load.
TEST Disengaged Engaged Closed Closed
Can be operated mechanically or electrically.
Control circuit operations can be tested & verified.
DISCONNECTED Disengaged Disengaged Closed Closed
Can be operated mechanically only.
Cannot be removed from the compartment.
WITHDRAWN Disengaged Disengaged Closed Opened
Can be operated mechanically only.
Can be removed from the compartment.
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DEH-41473 AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 3. Switchgear Description
©2016 General Electric. All rights reserved. 14
Primary Disconnect Shutter
DANGER: Electrical arc flash hazard. Personal
protection equipment required. Turn off power to the
equipment before working inside.
Primary disconnect shutters (Figure 3.15) are available as a
standard to provide protection against contact with the
energized stationary primary disconnects when the breaker is
removed from its compartment. Shutters are supplied as
standard component on all breaker compartments and future
breaker compartments. The shutters are constructed from
glass-reinforced polyester insulating material.
The shutters (movable barriers) prevent frontal access to the
primary disconnect line and load stationary disconnects.
The shutters are closed when the breaker is in the
DISCONNECTED Position. As the circuit breaker is racked from
the DISCONNECTED Position to the TEST Position the shutters
remain fully closed. As the breaker is racked from the TEST
Position to the CONNECTED Position, the shutters open
allowing the breaker to connect to the primary disconnects.
Figure 3.16 shows the shutter assembly with the shutter in
the open position.
Figure 3.15 Primary disconnect shutter (closed)
(1) Secondary Disconnect (Optional)
(2) Shutter Assembly (Closed)
(3) Cassette Side Barrier
(4) Racking Shaft
(5) Draw-out Rails
Figure 3.16 Primary disconnect shutter (opened)
(1) Shutter Assembly (Opened)
(2) Primary Disconnect Stab Tip (Typical)
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AKD-20 AR / Entellisys AR Low-voltage Switchgear DEH-41473
Section 3. Switchgear Description
15 ©2016 General Electric. All rights reserved.
Breaker Compartment Door
Each circuit breaker compartment door is provided with two
self-latching mechanisms with a single “T”-shaped door
handle (Figure 3.18).
To open the door, rotate the handle clockwise to release the
latch mechanisms and pull the door outward.
Operating the handle is not necessary to close the door.
Simply close the door and push on the door directly behind
each latching mechanism (Figure 3.18). Confirmation of the
door being latched can be achieved by pulling on the “T”-
shaped handle while not rotating the handle.
If a circuit breaker is to be removed from its compartment for
an extended period of time, it is strongly recommended that a
future breaker cassette barrier (Figure 3.17) and future
breaker door cover (Figure 3.18) be installed to keep any
potential electrical arcing events contained within the
equipment. Refer to Table 6-2 for future cassette and door
covers.
Behind the circuit breaker compartment door is a dead front
gasket (Figure 3.17). When the compartment door is closed,
the combination of the dead front gasket and the breaker
door gasket (Figure 3.17) provides the necessary sealing for
the arc resistant rating.
WARNING: The breaker compartment door must be
closed and latched to maintain the integrity of the arc
resistant enclosure. The breaker compartment door should
not be opened when the circuit breaker is closed and in the
connected position when the equipment is energized.
WARNING: When a circuit breaker is removed from its
compartment. The future cassette barrier and the future
breaker door cover must be installed and the circuit
breaker compartment door closed and latched to maintain
the integrity of the arc resistant enclosure.
CAUTION: If the dead front gasket of the breaker door
gasket is damaged, these components should be replaced
to ensure the integrity of the arc resistant enclosure.
Future Circuit Breaker Compartment
When specified, compartments may be supplied for future
addition of circuit breaker elements. These compartments
are fully equipped with draw-out rails, primary disconnects,
and ancillary devices as required (i.e. secondary disconnects,
accessory devices, etc.).
The opening in the breaker compartment door and the
opening in the cassette of the compartment are closed with
bolted-on steel plates to deter accidental contact with
energized electrical circuits (i.e. primary disconnect stab tips)
and provide the necessary closing to achieve the arc resistant
rating (Figure 3.17 and Figure 3.18).
Figure 3.17 Breaker compartment door (opened)
(1) Dead Front Gasket
(2) Breaker Door Gasket
(3) Self-latching Mechanism
(4) Future Breaker Door Cover
(5) Future Breaker Cassette Barrier
Figure 3.18 Breaker compartment door (closed)
(1) Push to Latch Area
(2) Future Breaker Door Cover
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