Powell LVSWGR-AR User manual

01.4IB.26263B
Low Voltage Arc Resistant Switchgear
Equipped with Magnum DS Circuit Breakers
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Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
Contact Information
Powell Electrical Systems, Inc.
powellind.com
[e-mail]
Service Division
PO Box 12818
Houston, Texas 77217-2818
Tel: [phone]
Fax: [phone]

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01.4IB.26263B
Signal Words
As stated in ANSI Z535.4-2007, the signal word is
a word that calls attention to the safety sign and
designates a degree or level of hazard seriousness.
The signal words for product safety signs are
“Danger”, “Warning”, “Caution” and “Notice”.
These words are defined as:
DANGER indicates an imminently hazardous
situation which, if not avoided, will result in
death or serious injury.
!
DANGER
!
WARNING
WARNING indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injury.
!
CAUTION
CAUTION, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
CAUTION, used without the safety alert
symbol, is used to address practices not
related to personal injury.
CAUTION
NOTICE
NOTICE is used to address practices not related
to personal injury.
Qualified Person
For the purposes of this manual, a qualified
person, as stated in NFPA 70E®, is one who has
skills and knowledge related to the construction
and operation of the electrical equipment and
installations and has received safety training to
recognize and avoid the hazards involved. In
addition to the above qualifications, one must also
be:
1. trained and authorized to energize,
deenergize, clear, ground, and tag circuits
and equipment in accordance with
established safety practices.
2. trained in the proper care and use of
personal protective equipment (PPE)
such as rubber gloves, hard hat, safety
glasses or face shields, flash clothing, etc.,
in accordance with established safety
practices.
3. trained in rendering first aid if necessary.

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Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
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01.4IB.26263B
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Contents
Ch 1 General Information ................................................................................................1
A. Scope ...............................................................................................................................................................2
B. purpoSe ............................................................................................................................................................2
c. InStructIon BulletInS AvAIlABle electronIcAlly ....................................................................................................2
Ch 2 Safety .......................................................................................................................3
A. SAfe Work condItIon .........................................................................................................................................3
B. SAfety GuIdelIneS ...............................................................................................................................................3
c. GenerAl ............................................................................................................................................................4
d. SpecIfIc .............................................................................................................................................................4
e. SAfety lABelS ....................................................................................................................................................5
Ch 3 Equipment Description ............................................................................................6
A. GenerAl ............................................................................................................................................................6
B. rAtInGS .............................................................................................................................................................7
Ch 4 Installation .............................................................................................................10
A. GenerAl ......................................................................................................................................................... 10
B. receIvInG ........................................................................................................................................................ 10
c. HAndlInG ....................................................................................................................................................... 10
1) Lifting the Switchgear ..........................................................................................................................................................11
d. StorAGe ......................................................................................................................................................... 11
e. poSItIonInG tHe MetAl-encloSed SWItcHGeAr ..................................................................................................... 12
1) Drawings and Diagrams .....................................................................................................................................................12
f. prepArAtIon of floor AncHorInG for Indoor MetAl-encloSed SWItcHGeAr .......................................................... 13
G. GroundInG ..................................................................................................................................................... 17
H. connectIonS ................................................................................................................................................... 17
I. MAIn BuS ASSeMBly InSulAtIon ......................................................................................................................... 18
1) Applying PVC Boots ..............................................................................................................................................................19
2) Cleaning Bus Insulation .......................................................................................................................................................19
J. poWer cABleS ................................................................................................................................................. 19
k. control cABleS .............................................................................................................................................. 20
l. InSertInG And reMovInG tHe cIrcuIt BreAker froM tHe cIrcuIt BreAker coMpArtMent ............................................. 20
M. InSpectIon And teStInG ..................................................................................................................................... 20
1) Inspection ................................................................................................................................................................................20
2) Testing ......................................................................................................................................................................................22

Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
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ii
Contents
Ch 5 Maintenance ..........................................................................................................23
A. GenerAl ......................................................................................................................................................... 23
B. overAll MAIntenAnce procedureS .................................................................................................................... 23
1) Equipment ...............................................................................................................................................................................24
2) Bus Insulation .........................................................................................................................................................................24
3) Mechanisms ............................................................................................................................................................................24
4) Primary Disconnect Device Contacts ...............................................................................................................................24
5) Control Contacts ....................................................................................................................................................................25
6) Secondary Wiring ..................................................................................................................................................................25
7) Mechanical Parts ...................................................................................................................................................................25
8) Ventilation ...............................................................................................................................................................................25
9) Battery and Charging Equipment .....................................................................................................................................25
10) Hardware .................................................................................................................................................................................25
11) Heaters .....................................................................................................................................................................................25
12) Breaker Maintenance Cover ................................................................................................................................................26
13) Records .....................................................................................................................................................................................26
c. ABnorMAl condItIonS ..................................................................................................................................... 27
Ch 6 Replacement Parts .................................................................................................28
A. orderInG InStructIonS ..................................................................................................................................... 28
B. recoMMended reneWAl pArtS .......................................................................................................................... 28

01.4IB.26263B
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Figures
Figure 1 Powell Low Voltage, Arc Resistant Switchgear ..............................................8
Figure 2 Removing the Circuit Breaker from the Switchgear ......................................9
Figure 3 Switchgear on Lifting Crane ........................................................................11
Figure 4 Chain/Cable Sling Installation .....................................................................14
Figure 5 Base View .....................................................................................................15
Figure 6 Side View ......................................................................................................16
Figure 7 Ground Bus Splice Bolt Assembly ................................................................18
Figure 8 Main Bus Splice ............................................................................................21
Figure 9 Plenum Vent .................................................................................................22
Figure 10 Arc Flash Preventers .....................................................................................22

Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
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iv
Tables
Table A Powell Low Voltage Arc Resistant Switchgear Ratings - Type 2B ........................7
Table B Magnum DS Circuit Breaker Ratings ....................................................................7
Table C Low Voltage Arc Resistant Switchgear Dimensions ..........................................16
Table D Bolt Torque Values for Powell Low Voltage Metal-Enclosed Switchgear ..........19
Table E Accessories ..........................................................................................................29

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General Information
01.4IB.26263B
Ch 1 General Information
!
WARNING
The equipment described in this document may contain high voltages and currents which can
cause death or serious injury.
The equipment is designed for use, installation, and maintenance by knowledgeable users of such
equipment having experience and training in the field of high voltage electricity. This document and all
other documentation shall be fully read, understood, and all warnings and cautions shall be abided by. If
there are any discrepancies or questions, the user shall contact Powell immediately at 1.800.480.7273.
!
WARNING
Prior to adjustments, servicing, maintenance, or any act requiring the operator to make physical
contact with the equipment, the power source must be disconnected and the equipment grounded.
Failure to do so may result in death or serious injury.
NOTICE
The information in this instruction bulletin is not intended to explain all details or variations of the
Powell equipment, nor to provide for every possible contingency or hazard to be met in connection
with installation, testing, operation, and maintenance of the equipment. For additional
information and instructions for particular problems, which are not presented sufficiently for the
user’s purposes, contact Powell at 1.800.480.7273.
Powell reserves the right to discontinue and to change specifications at any time without incurring
any obligation to incorporate new features in products previously sold.
NOTICE

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2General Information
Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
A. Scope
The information in this instruction bulletin
describes Powell low voltage arc resistant
metal-enclosed switchgear assemblies
equipped with Magnum DS Low Voltage Power
Circuit Breakers. The equipment described is
indoor type switchgear for applications up to
and including 635 Volts and 4000A.
Standard construction details are provided
in the appropriate sections. The circuit
breaker element operation and maintenance
instructions can be found in the Magnum
DS operating instruction manual provided
with each circuit breaker. Any special
switchgear construction details are provided in
supplementary documentation.
B. purpoSe
The information in this instruction bulletin
is intended to provide information required
to properly operate and maintain the low
voltage arc resistant switchgear equipped with
Magnum DS circuit breakers.
This instruction bulletin provides:
1. Safety guidelines
2. General descriptions of the operation
and maintenance of the low voltage arc
resistant switchgear
3. Instructions for installation of the
switchgear
4. Information for ordering renewal parts
5. Illustrations, photographs, and description
of the switchgear. Refer to the Eaton
publication shipped with the device for
circuit breaker information.
The illustrations contained in this document
may not represent the exact construction
details of each particular type of switchgear
section. The illustrations in this document
are provided as general information to aid in
showing component locations only.
All illustrations and photos are shown using
deenergized equipment.
Follow the appropriate safety precautions
while handling any of the equipment. Failure
to do so may result in death or serious injury.
!
WARNING
To the extent required, the products described
herein meet the applicable ANSI, IEEE, and
NEMA Standards; however, no such assurance
is given with respect to local codes and
ordinances which may vary greatly.
c. InStructIon BulletInS AvAIlABle electronIcAlly
Changes to the instruction bulletin may
be implemented at any time and without
notice. Go to powellind.com to ensure use
of the current instruction bulletin for Powell
equipment.
NOTICE
To contact the Powell Service Division call
1.800.480.7273 or 713.944.6900, or email
[e-mail].
For specific questions or comments pertaining
to this instruction bulletin email
[e-mail] with the
Instruction Bulletin number in the subject line.

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Safety
01.4IB.26263B
Ch 2 Safety
A. SAfe Work condItIon
The information in Section A is quoted from
NFPA 70E 2012 - Article 120, 120.1 Establishing an
Electrically Safe Work Condition.
120.1 Process of Achieving an Electrically Safe
Work Condition
1. Determine all possible sources of electrical
supply to the specific equipment. Check
applicable up-to-date drawings, diagrams,
and identification tags.
2. After properly interrupting the load current,
OPEN the disconnecting device(s) for each
source.
3. Wherever possible, visually verify that all
blades of the disconnecting devices are
fully OPEN or that drawout type circuit
breakers are withdrawn to the fully
disconnected position.
4. Apply lockout/tagout devices in accordance
with a documented and established policy.
5. Use an adequately rated voltage detector
to test each phase conductor or circuit part
to verify they are deenergized. Test each
phase conductor or circuit part both
phase-to-phase, and phase-to-ground.
Before and after each test, determine
that the voltage detector is operating
satisfactorily.
Informational Note: See ANSI/ISA-61010-1
(82.02.01)/UL 61010-1, Safety Requirements
for Electrical Equipment for Measurement,
Control, and Laboratory Use - Part 1: General
Requirements, for rating and design
requirements for voltage measurement
and test instruments intended for use on
electrical systems 1000 V and below.
6. Where the possibility of induced voltages
or stored electrical energy exists, ground
the phase conductors or circuit parts
before touching them. Where it could be
reasonably anticipated that the conductors
or circuit parts being deenergized
could contact other exposed energized
conductors or circuit parts, apply ground
connecting devices rated for the available
fault duty.
B. SAfety GuIdelIneS
Study this instruction bulletin and all other
associated documentation before installing the
switchgear.
Each user has the responsibility to instruct
and supervise all personnel associated with
usage, installation, operation, and maintenance
of this equipment on all safety procedures.
Furthermore, each user has the responsibility of
establishing a safety program for each type of
equipment encountered.
The low voltage circuit breakers used in the
metal-enclosed switchgear described in this
instruction bulletin are operated by a
high-energy, high-speed mechanism that
is interlocked to provide specific operating
sequences. It is mandatory that the following
rules be observed to ensure the safety of
personnel associated with usage, installation,
operation, and maintenance of these circuit
breakers.
The safety rules in this instruction bulletin are
not intended to be a complete safety program.
The rules are intended to cover only some of the
important aspects of personnel safety related to
Powell low voltage arc resistant switchgear.

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4Safety
Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
c. GenerAl
1. Only qualified personnel trained in
the usage, installation, operation, and
maintenance of the circuit breaker shall be
allowed to work on this equipment. It is
mandatory that this instruction bulletin, the
applicable Magnum DS instruction book,
any supplements, and service advisories be
studied, understood, and followed.
2. Maintenance programs must be consistent
with both customer experience and
manufacturer’s recommendations,
including service advisories and instruction
bulletin(s). A well planned and executed
routine maintenance program is essential
for circuit breaker’s reliability and safety.
3. Service conditions and circuit breaker
applications shall also be considered in the
development of safety programs. Variables
include ambient temperature; humidity;
actual continuous current; thermal cycling;
number of operations; interrupting duty;
and any adverse local conditions including
excessive dust, ash, corrosive atmosphere,
vermin and insect infestations.
d. SpecIfIc
1. DO NOT WORK ON ENERGIZED
SWITCHGEAR. If work must be performed
on the switchgear, remove it from service
and place it in an electrically safe condition.
2. DO NOT WORK ON THE SWITCHGEAR
WITH THE CONTROL CIRCUIT ENERGIZED.
3. EXTREME CARE MUST BE EXERCISED
TO KEEP ALL PERSONNEL, TOOLS, AND
OTHER OBJECTS CLEAR OF MECHANISMS
WHICH ARE TO BE OPERATED,
DISCHARGED, OR RELEASED. These
circuit breakers utilize stored energy
mechanisms. These mechanisms must be
serviced only by skilled and knowledgeable
personnel capable of releasing each spring
load in a controlled manner. Detailed
information regarding these mechanisms
is found in the Magnum DS circuit breaker
instruction bulletin.
4. DO NOT ATTEMPT TO CLOSE THE CIRCUIT
BREAKER MANUALLY ON AN ENERGIZED
CIRCUIT.
5. DO NOT USE AN OPEN CIRCUIT BREAKER
AS THE SOLE MEANS OF ISOLATING A
HIGH VOLTAGE CIRCUIT. For complete
isolation, the circuit breaker shall be in
the disconnected position or shall be
withdrawn completely.
6. ALL COMPONENTS SHALL BE
DISCONNECTED BY MEANS OF A VISIBLE
BREAK AND SECURELY GROUNDED FOR
SAFETY OF PERSONNEL PERFORMING
MAINTENANCE OPERATIONS ON THE
SWITCHGEAR.

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Safety
01.4IB.26263B
e. SAfety lABelS
The equipment described in this document
has DANGER, WARNING, CAUTION, and
instruction labels attached to various locations.
All equipment DANGER, WARNING, CAUTION,
and instruction labels shall be observed when
the circuit breaker is handled, operated, or
maintained.
Warning and Caution labels are located in
various places. Do not remove or deface any
of these warning/caution labels.
NOTICE

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6Equipment Description
Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
Ch 3 Equipment Description
A. GenerAl
Powell is committed to continuous product
improvement. It is possible that improvements
occurred between revisions to this document
and therefore, may not be described in these
instructions. If the equipment does not
resemble the photographs and descriptions
contained herein, do not attempt to perform
the actions. Contact the Powell Service
Division.
NOTICE
Powell Low Voltage Arc Resistant
Metal-Enclosed Switchgear described in
this bulletin is designed to comply with IEEE
Standard C37.20.1 (Standard for
Metal-Enclosed Low Voltage Power Circuit
Breaker Switchgear) and IEEE C37.20.7 (Guide
for Testing Metal-Enclosed Switchgear for
Internal Arcing Faults). The metal-enclosed
switchgear is a lineup of one or more
switchgear vertical sections, which are
enclosed on all sides, top, and bottom except
for the ventilation openings, lower unit
cable penetrations, and view windows. The
switchgear sections consist of full depth
structural frames and components providing
separate compartments for circuit breakers,
buses, cable and auxiliary components. The
section main bus and intersection bus is
isolated from the cable compartments.
Powell low voltage, arc resistant switchgear for
Magnum DS LVPCB circuit breakers consists of
multiple sections, fastened together as a single
group (Figure 1). It is completely operational
when installed and connected directly to
the customers’ power supply. Circuit breaker
compartments (Figure 2, g) are provided with
hinged access doors for installing or removing
the circuit breakers. Auxiliary compartments
(Figure 2, d) are provided with hinged access
doors for mounting and maintenance of
instruments, relays, and wiring. An overhead
breaker lifting device (Figure 2, a) is provided as
an option.
Powell low voltage, arc resistant switchgear
assemblies for Magnum DS LVPCB are
complex, high-current electrical equipment
designed to operate within the voltage and
current limitations shown on the equipment
nameplate. Do not apply this equipment to
systems with voltages and/or currents in excess
of these limits.
The equipment has been designed to operate
within the customers’ specifications with
regard to circuit capacity.

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Equipment Description
01.4IB.26263B
B. rAtInGS
Table A Powell Low Voltage Arc Resistant Switchgear Ratings - Type 2B
Maximum
Voltage
(volts)
Arc Fault
Current
(kA)
Short Time Current Short Circuit Current
Main Bus
(kA)
Riser Bus
(kA)
Main Bus
(kA)
Riser Bus
(kA)
635 85(.5s) 100 100 150 150
Table B Magnum DS Circuit Breaker Ratings
Continuous
Current Rating
(Amperes)
Breaker Type
Interrupting Class
(kA rms sym)1 Short Time 0.5s
(kA rms sym)1
254Vac 508Vac 635Vac
800
MDS-408 42 42 42 42
MDS-608 65 65 65 65
MDS-808 85 85 85 85
1200 MDS-612 65 65 65 65
MDS-812 85 85 85 85
1600 MDS-616 65 65 65 65
MDS-816 85 85 85 85
2000 MDS-620 65 65 65 65
MDS-820 85 85 85 85
2500 MDS-625 65 65 65 65
MDS-825 85 85 85 85
3000 MDS-630 65 65 65 65
MDS-830 85 85 85 85
3200 MDS-632 65 65 65 65
MDS-832 85 85 85 85
4000 MDN-840 85 85 65 85
Note: Standard frame circuit breakers rated 100kA are equipped with a high instantaneous
trip set to the withstand level.

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8Equipment Description
Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
Figure 1 Powell Low Voltage, Arc Resistant
Switchgear

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Equipment Description
01.4IB.26263B
Figure 2 Removing the Circuit Breaker from
the Switchgear
a. Powell Overhead Lifting Device
b. Overhead Lifting Device Handle
c. Overhead Lifting Device Cable
d. Instrument Comparment
e. Lifting Device Yoke
f. Circuit Breaker
g. Circuit Breaker Compartment
a
d
f
b
c
e
g
The arc resistant rating is only valid when
all doors are closed and properly latched or
bolted, and components are installed and
working properly. In addition, removal of
any breaker from its compartment without
reinstalling a breaker maintenance cover will
void the arc resistant rating.
!
DANGER
Note: Breaker maintenance covers for
compartments not equipped with circuit
breakers are not shown for illustrative
purposes only.

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10 Installation
Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
Ch 4 Installation
Contact the Powell Service Division for installation,
maintenance, and renewal parts assistance. To
contact the Powell Service Division call
1.800.480.7273 or 713.944.6900,
or email [e-mail].
It is the responsibility of the purchaser to set
or program components such as protective
relays, meters, timers, etc., in accordance with
the requirements of the particular installation,
before placing the switchgear with vacuum circuit
breakers into service. Programmable devices may
be shipped with temporary programming, used to
test the switchgear. Electromechanical relays may
be shipped in a blocked position to avoid damage
during shipment. Refer to separate instructions for
these components for information on setting or
programming.
A. GenerAl
This section contains information on receiving,
handling, positioning, power cable termination,
grounding, and checks to make the equipment
ready for operation.
Once the assembly of the metal-enclosed
switchgear is completed on site, all joints and
hardware, including bus connections, structural
assemblies, and control connections, should
be checked for tightness and proper torque
values. See Table D, Bolt Torque Values for Powell
Medium Voltage Metal-Enclosed Switchgear.
B. receIvInG
Powell metal-enclosed, low voltage arc
resistant switchgear is fabricated in rigid,
floor-mounted, self-supporting steel vertical
sections. The switchgear vertical sections
are shipped in an upright position and when
received should be kept upright.
When the switchgear is received, check for
signs of damage. If damage is found or
suspected, file claims as soon as possible with
the transportation company and notify the
nearest Powell representative.
Refer to the instruction bulletin furnished for
receiving, storage, and handling instructions
on the circuit breaker.
Some other components such as top-mounted
resistors or potential transformers, may also
be shipped separately. These components are
identified by a number coinciding with that of
the switchgear vertical section on which they
are to be mounted.
c. HAndlInG
Powell recommends the switchgear be
handled or moved by means of an overhead
crane. If an overhead crane is not available the
switchgear may be moved on an even surface
by the use of rollers or heavy duty pipes placed
under the switchgear. The use of a forklift
is not recommended, since the forks may
damage the compartments or interior parts
of the switchgear vertical sections. If no other
method of handling is available, the forks must
go completely under the switchgear base to
avoid damage to the switchgear.
The switchgear is shipped with the circuit
breakers installed unless other instructions
are given. If the circuit breakers are shipped
installed, they are done so in the open and
fully connected position. Refer to the Eaton
publication shipped with the device for
removal instructions of the circuit breakers.
See Figure 2 for use of the optional Powell
Overhead Lifting Device.

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Installation
01.4IB.26263B
1) Lifting the Switchgear
The maximum shipping section width is
102 inches. The equipment should be lifted
using an appropriately rated overhead
crane. The equipment should be lifted one
shipping section at a time or a maximum
total weight of 10,000 lbs. Lifting rings are
permanently attached at the front and rear
corners of the center compartment of each
section. Four lift points shall always be
used when lifting the switchgear
(Figure 3). If lifting a single section, then
three lift points are available. It is important
to note that when a spreader bar is not
being used that each lift chain/cable when
loaded maintain at least a 45°angle from
the horizontal plane. See Figure 4 for
proper lifting instructions.
Note: At 45° the force on each lifting
chain/cable is equal to the total load
divided by four divided by 0.707
making each less efficient. Angles less
than 45°can damage the switchgear.
Note: The customer is responsible for
providing the spreader bar.
Figure 3 Switchgear on Lifting Crane
d. StorAGe
Shipping and storage of electrical equipment
requires measures to prevent the deterioration
of the apparatus over a long unused period.
The mechanical and dielectric integrity must
be protected. Electrical equipment is designed
for use in a variety of environments. When
the equipment is in transit and storage, these
design considerations are not fully functional.
In general, the following measures must be
considered.
1. Equipment designed for indoor installation
must be stored indoors in a climate
controlled environment to prevent
condensation of moisture. Exposure to rain
and the elements, even for a short period,
can permanently damage the equipment.
Space heaters within the equipment should
be energized, if so equipped. Humidity
controlling desiccant materials should
be utilized when space heaters are not
provided or cannot be energized. The
temperature should be kept above 33°F/1°C
and below 140°F/60°C. The relative
humidity should be kept below 60% or a
dew point of 15°C/59°F. The equipment
should be stored in such a manner as
to leave all doors and panels accessible
for inspection. The equipment must be
inspected on a routine basis to assure
operational integrity.

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12 Installation
Low Voltage Arc Resistant Switchgear (LVSWGR-AR®)
Equipped with Magnum DS Circuit Breakers 01.4IB.26263B
2. Equipment designed for outdoor exposure
may be stored either in indoor or outdoor
storage locations. The equipment must
be protected from airborne external
contaminates if stored outdoors. Outdoor
storage will also require additional care
to maintain temporary covers over
the openings and shipping splits. The
equipment must be provided with control
power to facilitate the energization of
space heaters, as well as other temperature
and humidity controlling equipment. The
temperature should be kept above freezing
(>33°F/1°C) and below (<140°F/60°C). The
relative humidity should be kept below
60% or a dew point of 15°C/59°F. The
equipment should be stored in such a
manner as to leave all doors and panels
accessible for inspection. The equipment
must be inspected on a routine basis to
assure its integrity.
3. The auxiliary control devices, ship loose
material and protective relays must also
be protected. This includes items such as
battery chargers, UPS systems, lighting,
installation hardware and air conditioning.
If prolonged storage is anticipated,
humidity controlling desiccant materials
should be utilized. Desiccant packets
should be installed in all compartments and
packing containers.
e. poSItIonInG tHe MetAl-encloSed SWItcHGeAr
1) Drawings and Diagrams
Before any installation work is done, consult
and study all drawings and Bill of Materials
furnished by Powell for the particular
order. The drawings include arrangement
drawings and wiring and schematic
diagrams.
The recommended aisle space for the
front and at the rear of the metal-enclosed
switchgear is shown on the floor plan
drawing furnished for the particular order.
The space at the front must be sufficient
to permit insertion, withdrawal, and
transferring of the circuit breakers. The
space at the rear must be sufficient for
installation of cables, for inspection and
maintenance. The dimensions shown on
the switchgear drawings are those required
for proper operation of the switchgear.
When three or more sections are to be
arranged in one continuous line-up,
the center section should be the first to
be located. The other sections should
be installed in successive order in each
direction from the center of the structure.
When installing a unit substation or power
center, the power transformer and the
adjacent metal-enclosed switchgear line-up
should first be lined up and set in position
in accordance with the dimensions on
the base plan drawing for the installation.
The additional sections should then be
installed.
Establish a base line located a few inches in
front of the sections and parallel with the
desired front of the structure. Equalize the
distances from the front of the sections to
the base line to make the face of the group
parallel to the base line.
Applicable national or local codes or
regulations may require greater aisle space
than is needed for operation of the
metal-enclosed switchgear. It is the
purchaser’s responsibility to comply with
these codes and regulations.
CAUTION