Consultant Specification
Power Xpert CXHTM IEC
low voltage motor control and
power distribution center
Version 1.0 June 2015
INDEX
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
Scope
Service conditions
Codes and standards
Supply system and fault level
General requirements and arrangements
Safety requirements for operation and maintenance
Main busbar and dropper bar system
Incoming units
Bus section units
Motor starter units
Outgoing feeder units
Networked functionality
Internal wiring and terminals
Cable entry and termination
Earthing
Labeling
Painting
Spares and maintenance requirements
Inspection and testing
Off-loading and site storage
Erection and commissioning
1. SCOPE
1.1.
This standard covers the requirements for indoor low voltage, high performance
industrial type motor control center and switchgear, comprising busbars and functional
units, such as incoming, bus section, motor starter and outgoing feeder units.
1.2.
This standard shall be read in conjunction with the requisition.
2. SERVICE CONDITIONS
2.1.
The equipment shall be suitable for operating indoors in a safe location for use in a
pollution degree 3 environment (IEC 61439-1, par. 7.1.3).
2.2.
The degree of protection of the system shall be IP42
2.2.
The ambient temperature inside the substation / switch room is maximum 40°C, with a
maximum average of 35°C, over 24 hours. The lower limit of ambient air temperature is 5°C.
2.3.
The installation location altitude is less than 2000 meters. If altitude is greater than 2000
meters, de-rating of the assembly may be considered.
3. CODES AND STANDARDS
3.1.
The equipment offered shall comply with the latest editions of:
 This specification
 The applicable national regulations
 The following international standards =
IEC 60038 – IEC Standard voltages
IEC 60051 – Direct acting indicating analogue electrical measuring instruments and their
accessories – Part 1: Definitions and general requirements common to all parts
IEC 60059 - Standard curent ratings
IEC 60044-1 – Instrument Transformers – Part 1 : Current Transformers
IEC 60044-2 – Instrument Transformers – Part 2 : Inductive voltage Transformers
IEC 60112 - Method for determining the comparative and the proof tracking indices of solid
insulation materials under moist conditions
IEC 60269 - Low voltage fuses
IEC 60529 - Degrees of protection provided by enclosures (IP Code)
IEC 60947-1 - Low Voltage Switchgear and Control gear – Part 1: General rules
IEC 60947-2 - Low Voltage Switchgear and Control gear – Part 2: Circuit Breakers
IEC 60947-3 - Low Voltage Switchgear and Control gear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 60947-4-1 - Low Voltage Switchgear and Control gear – Part 4-1: Contactors and
motor-starters – Electromechanical contactors and motor-starters
IEC 61439-1 - Low voltage switchgear and controlgear assemblies, Part 1: General rules
IEC 61439-2 - Low voltage switchgear and controlgear assemblies, Part 2: Power switchgear
and control gear assemblies.
IEC TR 61641 - Enclosed low-voltage switchgear and controlgear assemblies. Guide for testing
under conditions of arcing due to internal fault. Technical Report.
4. SUPPLY SYSTEM AND SHORT CIRCUIT LEVEL
4.1.
The system characteristics shall be as specified on the requisition.
4.2.
The prospective short circuit current (rms and peak value) at the incoming terminals of
the switchgear shall be as specified on the requisition.
4.3.
The switchgear supplier shall submit, at quotation stage, a test report (design verification
in accordance with 61439-2) from an independent authority to prove the capability to
withstand the specified prospective short circuit fault current, at the required voltage
level as specified on the requisition.
4.4.
For determining the fault level of functional units, i.e. its wiring and components, the
current limiting effect of protection devices may be taken in account when they are
assembled into the final configuration into the panel.
5. GENERAL REQUIREMENTS AND ARRANGEMENTS
5.1. CONSTRUCTION
5.1.1. The switchgear shall be of a modular design, flush fronted, floor mounting and selfsupporting. The complete system shall be designed to have front and/or rear access,
depending on the requisition.
5.1.2. The switchgear shall comply with form ‘4b’ according IEC 61439-2, appendix AA.
5.1.3. The maximum height shall not exceed 2300 mm., excluding a possible separate
foundation frame and / or ventilation cowl, possible cable and bus duct connections on
top, or mounting on elevated floors.
5.1.4. The general construction shall be sufficiently rigid to accept the weight of a man
(nominally 100 kg.) on the top without harmful distortion.
5.1.5. A suitable lifting facility shall be available for each shipping section.
5.1.6. The switchgear enclosure protection degree shall be IP42 minimum according to
IEC-60529.
5.1.7. The design of the switchgear shall permit the erection of extension cubicles at either end
without disconnecting power to the switchgear until it is required to connect the busbars
together and without the need for metal cutting equipment or drilling busbars.
5.1.8. The switchgear / MCC shall be designed for a diversity factor of 0.8 (80%) for vertical
sections with two or more functional units. The switchgear/MCC supplier shall submit, at
quotation stage, test reports to prove these factors, taking in account the temperature
rise limits according to the IEC standards.
5.1.9. All withdrawable units shall be so designed, that disconnection of any terminated mainor auxiliary wiring / cables is not necessary.
5.1.10. All structure dimensions shall be according to DIN 41-488.
5.2. FUNCTIONAL UNITS
5.2.1. Incoming and outgoing bus section unit circuit breakers shall be of the withdrawable
type.
5.2.2. Motor starters up to 132 kW and outgoing feeders up to 630 A shall be of the fully
withdrawable type. All higher rated units shall be of the fixed mounting type.
5.2.3. Motor starters up to 18.5 kW, and/or feeders up to 63A, must have the capability of
being supplied in a half-size width drawer, in order to reach an optimized footprint.
5.2.4. All withdrawable units must have a closed-door racking mechanism that allows the safe
and easy procedure of rack-in and rack-out of the unit while keeping the unit door
closed, while maintaining the IP rating of each respective unit.
5.2.5. The system must allow for and indicate 3 states: Connected, Test, Disconnected
5.2.6. The withdrawable units must be tested for a minimum of 1000 mechanical operations.
5.2.7. All withdrawable units (chassis) shall have continuous earth connections while inserted
in the MCC compartments, in all functional positions: Connected-Test-Disconnected.
5.2.8. The racking mechanism of each functional unit must have a clear mechanical position
indication for each functional position: Connected-Test-Disconnected. This will ensure
the user has clear knowledge of the unit’s position and to help prevent the user from
over-torqueing the unit’s racking mechanism.
5.2.9. Withdrawable unit must have fully segregated phases and ‘arc free’ connectors to the
vertical busbars.
5.2.10 The racking mechanism of withdrawable units must be easily operated by a crank to be
supplied by the panel manufacturer.
5.3. SPARE AND SPACE COMPARTMENTS
5.3.1. "Spare" compartments, or “provisions”, shall be fully equipped for easy insertion and
function of properly rated units in the future as specified.
5.3.2. "Space" compartments shall be suitable to be equipped / upgraded at a future date
without de-energizing the switchgear/MCC or parts of it.
5.4. COMPONENTS
5.4.1. Circuit breakers (ACBs) shall have a stored-energy closing and breaking mechanism.
They shall be rated according to IEC 60947-2 category B. Circuit breakers shall have a
mechanical ON / OFF indication on the front as well as mechanical indication of the
charged/discharged state of the stored energy mechanism.
5.4.2. Contactors shall have a making / breaking capacity according to IEC 60947, as AC21 for
incomers and outgoing feeders and AC23 for motor starters. The ON/OFF indications
shall clearly be indicated on the front by means of the handle or a mechanical indicator.
5.4.3. Current transformers shall be of the epoxy enclosed type and provided with a removable
short circuit link. The accuracy shall be 1M5 (incomers and outgoing feeders), resp. 3M5
(motorstarters) for measuring and 5P10 for protection purposes. The secondary side
shall be 5A for incomers and outgoing feeders and 1A for motor starters.
5.4.4. Measuring devices shall be flush mounted and shall have an enclosure with a degree of
protection of at least IP42. Meters used for incoming units shall be 96 x 96 mm. and for
outgoing feeders and motor starters 48 x 48 mm. Number and type of required meters
shall be specified.
5.4.5 The trip class of the motor overload protection in the circuit breaker shall be electronic
and adjustable, at least of trip class 10 in accordance with IEC 60947-4-1.
5.5. ARRANGEMENTS
5.5.1. Unless otherwise specified, the manufacturer is free to arrange the items in the best
engineered manner into a common line-up.
5.5.2. The functional (withdrawable) units are to be rated such, that they can be placed at any
height, into each section.
5.5.3. Large (fixed) starters are preferred to be mounted in lower positions in their respective
5.5.4.
panels .
Each switchgear / MCC shall include if shown in the requisition documents:
- 10% spare of the installed outgoing feeder units, with a minimum of one per each
compartment size installed.
- 10% space of the installed motorstarter units, with a minimum of one per each
compartment size installed.
6. SAFETY REQUIREMENTS FOR OPERATION AND MAINTENANCE
6.1. INTERNAL ARC RESISTANCE
6.1.1. The switchgear shall be so designed, that the development of internal arcs, under
normal operating conditions, is prevented by providing ‘arc-free’ or ‘arc-proof’ areas,
inside the LV switchgear/ MCC. The concept of ‘arc-free’ or ‘arc-proof’ areas must be in
full accordance with the IEC TR 61641.
6.1.2. The functional units shall be so designed that a possible internal arc will be restricted to
the affected unit’s compartment, without damage to any adjacent compartments and
danger to persons in the proximity of the switchgear.
6.1.3. The main busbar of the system must be located at the top of each panel and fully
insulated, including connections and busbar holders, copper joints and covered bolts
6.1.4. The vertical (dropper) busbar, for the sections of the withdrawable units, must be fully
segregated and insulated.
6.1.5 During the racking procedure of the drawers, an “arc-free” area must be created by the
physical features insulating and isolating all power connections of the withdrawable unit
prior to electrical contact with the dropper busbar.
6.1.6. The switchgear shall be tested to confirm successful assessment of criteria 1 through 7
inclusively of IEC TR 61641.The switchgear supplier shall submit, at quotation stage, a
test report from an independent authority to prove conformity with IEC TR 61641 criteria
1 – 7.
6.2. INTERNAL SEPARATION
6.2.1. The segregation between the horizontal main busbar compartment and any other
compartment shall be IP2X minimum.
6.2.2. The segregation between any functional units with relation to other functional units shall
be IP2X at minimum.
6.2.3. Horizontal segregation barriers shall be so designed that falling of metal parts (e.g. nuts,
bolts, etc.) from one compartment to another is prevented.
6.3. ACCESSIBILITY
6.3.1. A mechanical interlock shall be provided on all "switching" enclosures to prevent the
cover or door being opened unless the component is in the "off" position.
6.3.2. With any door open or with unit withdrawn it shall not be possible to insert an IP2X test
finger (IEC 60529) on to live parts.
6.3.3. To comply with item 6.3.2. Shrouding is mandatory; shutters shall not be used to
achieve the IP2X rating.
6.4. MECHANICAL INTERLOCKS
6.4.1. The mechanism operating handles of all air circuit breakers, switches and fusedswitches shall allow padlocking in the "off" position only.
6.4.2. On withdrawable units, a mechanical interlock function and safety concept shall be
utilized that:
 Prevents racking and un-racking functions while the handle position of the switching
device is in the ON position (padlock). The functional unit door will not open while
handle of the switching device (like a MCCB) is in the ON position. There shall be no
means of bypassing this safety feature.
The door is interlocked with the “disconnected” position. Racking functions shall not
be possible while the functional unit door is open independent of the handle position.
 Will maintain its correct operation over the lifetime of the assembly (minimum 25
years)
 Provide a positive visual indication that the interlock system is engaged.
 It shall not be possible to close the functional unit door (or the isolating device) with
the unit in a partly withdrawn position.
 The functional units shall be fully withdrawable and the different positions of
withdrawable parts (connected, test, isolated and removed) shall be achieved in
accordance with table 103 of the IEC 61439-2. The degree of protection in the test
and isolation position shall be at least / IP4.
On the incoming feeders of switchgear / MCC's, coupled by means of a bus coupler, key
interlocks of the “Ronis” type shall be provided to allow only safe manual transfer
operations when opening and closing the appropriate circuit breakers. As optional, it can
be required an automatic transfer schemes, to be detailed into the data sheet of the
project.

6.4.3.
7. MAIN BUSBAR AND DROPPER BAR SYSTEMS
7.1.
All current-carrying parts shall be of hard drawn, high conductivity copper.
7.2.
Main busbars, including neutral and earth, shall be located in the busbar compartment of
the switchgear at the top of each panel.
7.3.
The main busbar of the system must be fully insulated, including connections and
busbar supports, copper joints and covered bolts.
7.4.
The vertical (dropper) busbar, for the sections of the withdrawable units, must be fully
segregated and insulated.
7.5.
When using the compact half-width functional units, for motor starters up to 18.5 kW,
and/or feeders up to 63A, the dropper busbar in their associated panel must be of the
double configuration, with a maximum rating up to 2000A with double droppers.
7.6.
Busbars and dropper bars shall be fully rated to meet or exceed the fault levels as
specified.
7.7.
Busbars shall be fully rated to the current carrying capacity as specified. Neutral bars
shall be rated at 100% of the current rating and dimension of the phase bars.
7.8.
Busbar joints and tee-offs shall be clamped connections.
For all electrical main connections the correct torque shall be applied for fixing bolts. The
switchgear supplier shall indicate the applicable torques in the maintenance manual.
7.9.
Main busbars shall be readily suitable for future extension at both ends of the assembly.
7.10. Main busbars shall be of the same current ratings and dimensions throughout their
entire length. Bus tapering shall not be permitted.
7.11. The vertical (dropper) busbar system shall be virtually ‘Maintenance Free’, and its
connections can be easily maintained if necessary with front access, without the need
for rear access to the panel. The type of connection between the withdrawable
functional units and the dropper busbar shall be of the “scissor-connection” type.
8. INCOMING UNITS
8.1.
Incoming units shall be provided with an independent manually operated air circuit
breaker as specified. If specified in the data sheet, an electrically operated ACB can be
required. Depending on the ratings, for instance if less than 800A / 40kA, the incoming
unit can also be an independent MCCB section.
8.2.
Air circuit breakers shall be of the draw-out type. They shall be provided with a direct
working short circuit protection and time delayed overcurrent protection of the electronic
type. The time of selectivity between the circuit breakers must be achieved with a ZSI –
Zone Selective Interlocking system - according described into IEC 61912-2 – Low
8.3
8.4
voltage switchgear and control gear. The ZSI system must not require any auxiliary
power to its operation, and it may be applied for faults between phases, earth-faults or
both.
Each incoming unit shall be mounted in a separate compartment and shall not be
mounted in the same panel as outgoing feeder/ starter units.
Each incoming unit shall be provided with a separate metering compartment. The type
and number of required meters shall be as specified in the requisition.
9. BUS SECTION UNITS
9.1.
Bus section units shall be provided with independent manually-operated fuse-switches
or isolating switches as specified.
9.2.
Each bus section unit shall be housed in a separate compartment.
10. MOTOR STARTER UNITS
10.1. The standard motor starter configuration is: DOL (contactor + MCCB) + intelligent relay
+ CTs and meter, with all components mounted into the withdrawable unit, up to 132
kW.
10.2. The motor starter coordination shall be type "2" according to IEC 60947-4-1
10.3. Each motor starter unit shall be provided with an independent manually operated circuit
breaker, operable from the front and, capable of breaking the stalled motor current of the
largest motor, which that unit is allowed to feed.
10.4. Current transformers for remote ammeters shall be provided if specified. If local
ammeters are specified they shall have a compressed overload scale (6 times FLC).
10.5. The control voltage shall be up to 230V AC, according to the technical data sheet, and
derived from the auxiliary busbar located in the cable compartment. The auxiliary busbar
shall be at least IP2X.
10.6. One red “run” and one green “stop” pilot light shall be provided on the front of each unit.
On 2-speed and reversing starters additional pilot lights shall be provided as specified.
10.7. The use of resistors shall not be allowed.
10.8. Unless otherwise specified, all motor starter units shall be of the "direct-on-line" type for
use with 3-phase induction motors.
10.9. Reversing and 2-speed contactors shall be electrically interlocked to prevent contactors
closing at the same time.
10.10. Starters of the same size and starting type shall be completely interchangeable.
11. OUTGOING FEEDER UNITS
11.1. Outgoing feeder units shall be circuit breakers, such as ACB or MCCB types, depending
on the voltage ratings. For voltage > 800A, ACB types must be used. For voltage <=
800A, MCCB types can be used.
Metering instruments shall be provided if specified.
11.3. The standard feeder configuration is: MCCB type + CTs and meter, all mounted into the
withdrawable unit, up to 630A. CT’s shall not be mounted in the outgoing cable
connections compartment.
12. NETWORKED FUNCTIONALITY
12.1
Internal network containing network cable drops for all loads and future spares as
outlined in the approved requisition documents.
12.2. Network components to be pre-installed (i.e. Profibus Repeaters, Power supplies etc.)
within each Vertical section as required.
12.3
Network cabling system with be internally connected and provided as a single point
access cable that is available to the outside network master.
12.4
Network system will meet or exceed operating temperature requirements for the MCC.
12.5
All Network slaves will be provided with appropriate network communication cards
12.6
12.7
12.8
12.9
12.10
12.11
12.12
12.14
13.
13.1.
13.2.
13.3.
13.4.
13.5.
13.6.
13.7.
13.8.
suitable for use on the installed network and as specified and approved.
Network slaves will be provided with default settings, used for factory testing, or as
approved.
Wiring diagrams will show all network connections
Network configuration drawing will be supplied showing location and wiring of all network
components including repeaters and power supplies.
Networking mapping information will be provided for all slave devices.
Repeaters will be supplied pre-configured, as tested, with all documentation.
Network system will be supplied such that all components are suitable for use at the
designated design speed / baudrate (e.g. 125K)
As required, certain network protocols maybe supported by use of a communication
Gateway that will be pre-installed and configured.
12.13 All devices that require a unique network identification address or tag for their
associated communication protocol, such as IP address or other addressing types, shall
have these identifiers preset at the factory and will be recorded in the project
documentation.
Profibus cable will be suitable and approved for Profibus DP. Cable will have an ACM
rating of 600V 75 degrees C (or equivalent).
INTERNAL WIRING AND TERMINALS
All internal wiring shall be suitable sized in accordance with the applicable standards
and / or manufacturer’s instructions for the used components, with a minimum of
1.5 sq. mm. Secondary wiring from current transformers shall be at least 2,5 sq. mm,
and flexibility class V (minimum) or VI (preferable).
Auxiliary wiring is identified with markings in black letters / figures onto the insulation or
by means of white clip-on code markers with black letters / figures. The marking shall be
in accordance with the related wiring diagrams.
No more than one wire shall be connected to each terminal, unless the terminal is fit to
connect more than one conductor. Where common connections are required, terminal
jumper strips shall be used.
All internal wiring shall be connected to the same side of the terminal block; the other
side shall only be used for external wiring.
Main cable terminals allowing the conductors to be connected without the use of cable
lugs of any type is strongly preferred. They shall guarantee sufficient contact pressure
without damaging the cable conductors.
Terminals for auxiliary wiring and cables shall be of the self-clamping type.
Terminals shall be identified in accordance with the related wiring diagram.
It shall be possible to safely carry out any work on the main and auxiliary wiring of a unit,
when de-energized with all other units remaining energized
14. CABLE ENTRY AND TERMINATION
14.1. For incomers it shall be specified if cable(s) or busduct(s) are used. The direction of
busduct(s) will be as specified. All outgoing cables will be as specified.
14.2. Switchgear shall have facilities for the entry of cables from either top or bottom on
incoming feeders and top and/or bottom on outgoing units with a cable compartment.
14.3. Vertical sections with two or more functional units shall be provided with a separate
vertical cable compartment to run the full height of the equipment. The width of this
compartment shall be at least 400 mm. Facilities for fixing the cables shall be provided
within this compartment.
14.4. Unless otherwise specified, the purchaser shall provide the necessary cable glands, clamps and -lugs.
14.5. It shall be possible to terminate cable at any outgoing unit in complete safety with all
other outgoing units energized.
14.6. Cable way doors shall be equipped with a three-point locking system.
15. EARTHING
15.1. The switchgear shall be provided with a continuous main earth bar along the whole
length, located in the busbar compartment. The minimum size shall be 40x10 mm.
15.2. A vertical earth bar shall be provided in each vertical section along the whole height of
the equipment. The minimum size shall be 30x10 mm. It shall have provisions for
termination of an earth conductor per specified cable.
15.3. The earth bars shall be copper and suitably sized to withstand the fault current level and
fault clearing time under the prospective short circuit conditions for a solidly earthed
system.
15.4. The switchgear’s enclosures shall be bonded to these earth bars, including all individual
vertical sections, all fixed and withdrawable-type equipment when in service position and
all metal cable sheets. When earth continuity of removable or withdrawable parts is
arranged via metal support surfaces, the switchgear / MCC supplier shall provide type
test certificates, indicating fulfillment of the requirements of effective conductivity and the
precautions necessary to guarantee permanent good conductivity.
15.5. Doors mounted with voltage carrying equipment shall be earthed by means of a suitable
sized flexible copper conductor.
15.6. When racking the functional units into service, the first electrical connection to be made
will be the earth connection. When racking the functional unit out of service, the last
electrical connection to be broken will be the earth connection.
16. LABELING
16.1. Labels shall be "resopal" or similar, with black letters on a white background. They shall
be fixed to the switchgear by means of proven durable self-threading screws or rivets or
by insertion into the appropriate mounting slot.
16.2. One label per compartment, indicating the compartment number (A, B, C, etc.) and the
connected equipment and/or equipment number, shall be provided. Minimum label
dimension 63 x 21.7 mm. Letter heights shall be at least 4 mm.
16.3. Each removable or withdrawable unit shall contain the same equipment as indicated on
the front door.
16.4. Safety shutters for ACB’s shall be clearly labeled with 25 mm high white letters on a red
background, as follows:
- Busbar shutters marked "BUS-BAR"
- Incoming circuit shutters marked "INCOMING SUPPLY"
16.5. Removable safety shrouds shall be fitted with "DANGER" warning labels.
17. PAINTING
17.1. The standard painting method is:
- pre-treatment (degreased, phosphate coating, made passive)
- powder coating (thermosetting powder with epoxy resin as base, applied electrostatically
in average layer thickness of 60 – 70 micrometers)
17.2. The color of all outer walls (rear wall, top plates, compartment covers and external
sidewalls) shall be RAL7035.
17.3. Profiles, support brackets, mounting plates, separations, partitions, etc. inside the
enclosure shall be of galvanized sheet steel.
18.
18.1.
18.2.
18.3.
SPARES AND MAINTENANCE REQUIREMENTS
The manufacturer shall submit a recommended spare parts list.
The manufacturer shall state and price separately in its quotation all necessary special
tools and equipment required for proper maintenance and testing at site.
The manufacturer shall submit together with the switchgear an erection, operating and
maintenance manual.
19.
19.1.
19.2.
19.3.
19.4.
INSPECTION AND TESTING
The purchaser will specify whether a factory acceptance test, witnessed by purchaser or
their representative, will be required for each switchgear.
Factory acceptance tests shall be carried out on the complete assembled switchgear, as
follows:
visual inspection to verify whether the composition of the assembly is in accordance with
the approved order documents
Measurement of the insulating resistance
High-voltage test in accordance with IEC 61439, item 11.9
Check of electrically operated switchgear
Functional test of mechanical interlocks
Check on interchangeability of equal components
Complete records of the above inspection and tests shall be compiled into one
inspection document by the manufacturer. A copy shall be sent to the purchaser.
The purchaser may, at their option, request special testing requirements. When this is
the case, the special requirements should be issued to the manufacturer so any
additional costs or charges will be identified and quoted as necessary.
20. OFF-LOADING AND SITE STORAGE
20.1. The equipment shall not be dispatched from the manufacturer's production facility until a
date of arrival at the site is agreed with the purchaser. This is to ensure that proper
arrangements are made for receipt and off-loading. The purchaser can also waive for
this right, since the manufacturer was formally informed about this option.
20.2. The manufacturer shall indicate in its quotation whether facilities for off-loading should
be arranged by purchaser.
20.3. The manufacturer shall indicate in its quotation the minimum conditions for temporary
storage at site.
21. ERECTION AND COMMISSIONING
21.1. The term "erection" shall be interpreted as “fixing and leveling on prepared foundations
and the bolting together of sections, busbars, and other loose items, to form a complete
unit”.
21.2. The purchaser will specify whether erection, supervision of erection, or no erection is
required from the manufacturer.
21.3. The purchaser will specify whether commissioning is required from the manufacturer.
EXAMPLE LVS SPECIFICATION – MCC:
[Default Spec] ; [Optional Spec] ; [2nd Optional Spec]
STANDARDS AND REGULATIONS:
- IEC 61439-1 / IEC 61439/2 / IEC TR 61641
- Standard specification LV Switchgear and Motor Control Centre
INSTALLATION ENVIRONMENT:
- Location : Indoor
- Altitude : <= 2000 m
- Ambient temperature (24 hr average) : 35 degrees C
- Pollution degree : 3
- Degree of protection : IP42
SUPPLY DETAILS:
- Earthing system : [TN-S] ; [TN-C-S]
- External connection : L1, L2, L3, N, PE
- Rated Voltage (Un) : [415V] ; [440V] ; [480V]
- Rated frequency (fn) : [50 Hz] ; [60 Hz]
- Rated short-term withstand current (Icw) : [50 kA] ; [65 kA] ; [80 kA]
ASSEMBLY AND ERECTION:
- Incoming cables : Bottom
- Outgoing cables : Bottom
- Type of access : [Front] ; [Rear]
- Max. height : 2300 mm
- Internal form of separation : [3B] ; [4B]
MAIN BUSBAR SYSTEM:
- Position : Top
- Rated current (In) : [1600 A] ; [2500 A] ; [3200 A]
- Rated short time withstand current (Icw) : 50 kA / 1s
- Rated peak withstand current (Ipk) : 110 kA
- Number of bars : L1, L2, L3, N, PE
- Neutral rating : N = 100 %
VERTICAL BUSBAR SYSTEM:
- Rated current (In) : 800 A
- Rated short time withstand current (Icw) : 50 kA / 1s
- Insulation : phase to phase, phase to neutral and phases / neutral to ground insulated
- Number of bars : L1, L2, L3, N
- Neutral rating : N = 100 %
INCOMING FEEDERS AND BUSCOUPLERS
-
Air circuit breaker, type Eaton NRX, 4 pole 1600 A, 50 kA
Withdrawable design
Mechanical ON and OFF pushbutton
Pushbutton padlocking facility
Trip unit, type Eaton Digitrip 520LSI
Auxiliary Switch local / remote
Auxiliary Switch open / close
Signal lamps open / close / trip
OUTGOING MOTOR STARTER UNITS (DOL) ≤ 15 kW
Motor Circuit Protection, type Eaton series G
Contactor, type Eaton DILM
Electronic Overload, type Eaton C400 Series
- Withdrawable design, with racking system to allowed for racking behind closed door.
- MCP interlocked with the door so the door can only be opened in OFF-position of the
switch.
- All withdrawable units must have a closed-door racking mechanism that allows the safe
and easy procedure of rack-in and rack-out of the unit while keeping the unit door
closed, while maintaining the IP rating of each respective unit.
- The door must be interlocked with the “disconnect” position. No racking functions shall
be possible while the door is open independent of the handle position.
- The degree of protection in the test and isolation position shall be at least IP42.
- Padlock facility in the appropriate positions.
- Signal lamps (on / off ), Eaton type M22-series.
OUTGOING MOTOR STARTER UNITS (DOL) ≥ 15 kW
Motor Circuit Protection, type Eaton series NZM
Contactor, type Eaton DILM
- Electronic Overload, type Eaton C400 SeriesWithdrawable design up to 132kW
- MCP interlocked with the door which can only be opened in OFF-position of the switch.
- All withdrawable units must have a closed-door racking mechanism that allows the safe
and easy procedure of rack-in and rack-out of the unit while keeping the unit door
closed, while maintaining the IP rating of each respective unit.
- The door must be interlocked with the “disconnect” position. No racking functions shall
be possible while the door is open independent of the handle position.
- The degree of protection in the test and isolation position shall be at least IP42.
- Padlock facility in all appropriate positions
- 3 Signal lamps (on / off / trip), Eaton type M22-series
- Auxiliary protection by Miniature Circuit Breaker, type Eaton PLSM-C2
- 1 CT for Amp-metering (for motor starters ≥ 4 kW)
- DIN48 Amp Meter in front compartment
- 1 Core Balance CT, type Eaton ELRCT and protection device, type Eaton ELR1ADJ for
earth leakage protection (for motor starters ≥ 30 kW)
OUTGOING FEEDER UNITS (OF) ≤ 630 A
Moulded Case Circuit Breaker, type Eaton NZM
- Withdrawable design
- Moulded Case Circuit Breaker interlocked with the door which can only be opened in
OFF-position of the switch.
- All withdrawable units must have a closed-door racking mechanism that allows the safe
and easy procedure of rack-in and rack-out of the unit while keeping the unit door
closed, while maintaining the IP rating of each respective unit.
- The door must be interlocked with the “disconnect” position. No racking functions shall
be possible while the door is open independent of the handle position.
- The degree of protection in the test and isolation position shall be at least IP42.
- Padlock facility in all appropriate positions