Siemens NXAIR User manual

Medium-Voltage Switchgear
Air-Insulated Switchgear NXAIR
≤17.5 kV / ≤40 kA / ≤4000 A Busbar Current
INSTALLATION INSTRUCTIONS
Order No.:
110-0084.9
Issue:
December 2020
Revision:
15
© Siemens AG 2020. All rights reserved.

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About these Instructions
These instructions do not purport to cover all details
or variations in equipment. Theycan also not provide
for every possible contingency to be met in
connection with installation or operation.
For details about technical design and equipment
like e.g. technical data, secondary equipment, circuit
diagrams, please refer to the order documents.
The switchgear is subject to continuous technical
development within the scope of technical progress.
If not stated otherwise on the individual pages of
these instructions, we reserve the right to modify the
specified values and drawings.
All dimensions are given in mm.
For further details, e.g. about additional equipment,
please refer to catalog HA 25.71.
Should further information be desired or should
particular problems arise which are not covered
sufficiently by these instructions, the matter should
be referred to the competent Siemens department.
The contents of this instruction manual shall not
become part of or modify any prior or existing
agreement, commitment or relationship. The Sales
Contract contains the entire obligations of Siemens.
The warranty contained in the contract between the
parties is the sole warranty of Siemens.
Any statements contained herein do not create new
warranties or modify the existing warranty.

110-0084.9 / 15 NXAIR / ≤40 kA 3
Safety instructions
1 Safety instructions
Hazards are classified in accordance with ISO 3864-2 using the following keywords:
•DANGER, WARNING or CAUTION, in case of personal injury
•NOTICE for material damage
Hazards are classified and indicated in the Installation Instructions as follows:
DANGER
Signal word indicates an immediate and imminent hazardous situation.
If the hazard is not avoided, death or serious injury will be the consequence.
WARNING
Signal word indicates a potentially hazardous situation.
If the hazardous situation is not avoided, death or serious injury can be the
consequence.
CAUTION
Signal word indicates a potentially hazardous situation.
If the hazardous situation is not avoided, minor or moderate injury can be the
consequence.
Definitions and symbols
NOTICE
Indicates a potentially damaging situation.
If the damaging situation is not avoided, the product or something in its vicinity may
sustain damage.
INFORMATION
Provides additional information to clarify or simplify a procedure.
Observe the information.
Operation symbol:
Asks the operator to perform an operation.
Result symbol:
✓
Identifies the result of an operation.

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Contents
1Safety instructions...............................................................................................................................3
2General instruction..............................................................................................................................7
2.1 General instructions .............................................................................................................................. 7
2.2 Five Safety Rules of Electrical Engineering............................................................................................ 7
2.3 Hazardous substances.......................................................................................................................... 7
2.4 Personal protective equipment (PPE)..................................................................................................... 8
3Due application....................................................................................................................................8
4Qualified personnel .............................................................................................................................9
5Preparing installation ........................................................................................................................10
5.1 Preliminary clarifications...................................................................................................................... 10
5.2Switchgear room................................................................................................................................. 10
5.3 Foundation.......................................................................................................................................... 10
5.4 Dimensions of the switchgear room ..................................................................................................... 12
5.5 Switchgear with absorber .................................................................................................................... 13
5.6 Switchgear with evacuation ducts ........................................................................................................ 14
5.7 Intermediate storage ........................................................................................................................... 15
5.8 Intermediate storage of the transport units ........................................................................................... 16
5.9 Accessories ........................................................................................................................................ 16
5.10 Tools .................................................................................................................................................. 17
5.11 Comments on electromagnetic compatibility......................................................................................... 18
5.12 Installation and fixing material without additional earthquake stabilization.............................................. 19
5.13 Installation and fixing material with additional earthquake stabilization................................................... 22
5.14 Drilling template for additional earthquake stabilization......................................................................... 25
6Unloading and erection .....................................................................................................................27
6.1 Transport units and packing................................................................................................................. 27
6.2 Unloading ........................................................................................................................................... 27
6.3 Checking for completeness and transport damage............................................................................... 28
6.4 Center of gravity of the panel............................................................................................................... 29
6.5 Transport weights and dimensions without packing .............................................................................. 30
6.6 Transport to the place of installation (switchgear room)......................................................................... 31
6.7 Removing the transport units from the wooden pallets.......................................................................... 31
6.8 Applying the lifting tool at the panel...................................................................................................... 33
6.9 Mounting the craning angles................................................................................................................ 34
6.10 Lifting with crane rods.......................................................................................................................... 37
6.11 Lifting by means of chains and crane hooks......................................................................................... 41
6.12 Further transport without wooden pallets.............................................................................................. 43
6.13 Installing the transport units................................................................................................................. 46
6.14 Foundation cutouts.............................................................................................................................. 46
6.15 Transport protection at the service truck............................................................................................... 46
7Assembling the panels......................................................................................................................47
7.1 Tightening torques and control tightening torques for bolted joints......................................................... 47
7.2 Interconnecting the panels, preparation................................................................................................ 48
7.3 Undoing the transport fixing of the busbars .......................................................................................... 48
7.4 Aligning the panels.............................................................................................................................. 49
7.5 Fastening the panels to the foundation................................................................................................. 50
7.6 Assembling the busbars ...................................................................................................................... 53
7.7 Accessing the busbar compartment ..................................................................................................... 54
7.8 Closing the busbar compartment ......................................................................................................... 80
7.9 Bolting panels together........................................................................................................................ 86
7.10 Interconnecting the earthing busbar..................................................................................................... 99
7.11 Earthing the switchgear......................................................................................................................100
7.12 Installing the fan for forced ventilation .................................................................................................101
7.13 Switchgear protection IP4X (optional) .................................................................................................113
7.14 Components without installation activity..............................................................................................113
8Accessing the connection compartment through the front...........................................................115
8.1 Preparations before accessing the connection compartment................................................................115
8.2 Accessing the connection compartment through the switching-device compartment.............................119
8.3 Accessing the connection compartment through the switching-device compartment at panel versions with
ventilation system type I .....................................................................................................................124

Contents
110-0084.9 / 15 NXAIR / ≤40 kA 5
8.4 Accessing the connection compartment through the switching-device compartment at panel versions with
ventilation system type II.................................................................................................................... 129
8.5 Accessing the connection compartment through the switching-device compartment at panel versions with
voltage transformer compartment....................................................................................................... 133
9Accessing the connection compartment through the rear ............................................................140
9.1 Accessing the connection compartment through the rear sideof the panel ..........................................141
9.2 Accessing the connection duct through the rear side of the panel........................................................ 146
10 Electrical connections.....................................................................................................................149
10.1 Checking the contact surfaces ........................................................................................................... 149
10.2 Cutting the rubber sleeves to size ...................................................................................................... 150
10.3 Use of cable lugs............................................................................................................................... 151
10.4 Cable clamps.................................................................................................................................... 152
10.5 Cable sealing ends............................................................................................................................ 153
10.6 Dimensions of single-core cables....................................................................................................... 154
10.7 Dimensions of three-core cables........................................................................................................ 156
10.8 Assembly of cable sealing ends for single-core cables (except for contactor panel with panel
width 435 mm)................................................................................................................................... 157
10.9 Assembly of cable sealing ends for single-core cables in contactor panel with panel width 435 mm......160
10.10 Assembly of cable sealing ends for three-core cables (except for contactor panel with panel
width 435 mm)................................................................................................................................... 161
10.11 Assembly of cable sealing ends for three-core cables in contactor panel with panel width 435 mm....... 166
10.12 Connecting control cables.................................................................................................................. 171
10.13 Connecting bus wires ........................................................................................................................ 171
11 Closing the connection compartment / connection duct...............................................................172
11.1 Installing the vertical partition in the switching-device compartment..................................................... 173
11.2 Installing the vertical partition and the ventilation duct type I in the switching-device compartment........ 177
11.3 Installing the vertical partition and the ventilation duct type II in the switching-device compartment....... 182
11.4 Installing the bushing plate, the vertical partition and the voltage transformer compartment in the
switching-device compartment........................................................................................................... 186
11.5 Installing the rear wall on the connection compartment ....................................................................... 193
11.6 Installing the rear walls on the connection duct................................................................................... 197
12 Final assembly work........................................................................................................................199
12.1 Cleaning the switchgear..................................................................................................................... 199
12.2 Tighteningtorques and controltightening torquesfor boltedjoints .............................................................. 200
12.3 In panels without ventilation duct: Check the floor fixing in the switching-device compartment.............. 201
12.4 Checking the panel connection links...................................................................................................201
12.5 Checking the installation of the wiring duct covers .............................................................................. 201
12.6 Checking control cable connections................................................................................................... 201
12.7 Checking the vertical partition between the switching-device compartment and the connection
compartment..................................................................................................................................... 201
12.8 Checking the rear wall at the connection compartment........................................................................ 201
12.9 Checking the bushings....................................................................................................................... 201
12.10 Checking the withdrawable part on the service truck / checking the switching-device truck................... 202
12.11 Checking the service truck................................................................................................................. 202
12.12 Checking and completing protection against adverse environmental influences (protection against
corrosion).......................................................................................................................................... 203
12.13 High-voltage door with ventilation flap................................................................................................ 203
12.14 Checking assembly work................................................................................................................... 204
12.15 Correcting circuit diagrams ................................................................................................................ 204
12.16 Installation report............................................................................................................................... 204
13 Installation of withdrawable parts / switching-device trucks.........................................................205
13.1 Solenoid interlocks (optional) in the operating mechanism for withdrawable parts / switching-device trucks
......................................................................................................................................................... 205
13.2 Removing the locking bolts ................................................................................................................ 205
14 Commissioning procedure..............................................................................................................206
14.1 Safety instructions............................................................................................................................. 206
14.2 Update of the firmware of protection relays......................................................................................... 206
14.3 Drying dampness .............................................................................................................................. 207
14.4 Instructing the operating personnel..................................................................................................... 207
14.5 Checking the accessories.................................................................................................................. 207
14.6 Checking the interlocks mechanically................................................................................................. 207
14.7 Test operation...................................................................................................................................208
14.8 Switching on operational high voltage................................................................................................. 209

Contents
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15 Customer support............................................................................................................................211
15.1 Service..............................................................................................................................................211
15.2 Repairs..............................................................................................................................................211
15.3 Before you call...................................................................................................................................211
15.4 Service contact ..................................................................................................................................211
16 Service information .........................................................................................................................212
16.1 Switchgear extension .........................................................................................................................212
16.2 Spare part orders...............................................................................................................................212
16.3 Replacement of panels and components.............................................................................................212
16.4 Disposal.............................................................................................................................................212
17 Installation report.............................................................................................................................213
18 Index.................................................................................................................................................220
Document information:
Title: Installation Instructions
Order number: 110-0084.9
Additional order number: 8BX3300-0LA00-0AA1
Revision: 15
Issue: December 2020

110-0084.9 / 15 NXAIR / ≤40 kA 7
General instructions
2 General instruction
2.1 General instructions
Independently of the safety instructions given in these Installation Instructions, the local laws, ordinances,
guidelines and standards for operation of electrical equipment as well as for labor, health and environmental
protection apply.
Please do absolutely observe the following:
•The personnel must read these Installation Instructions completely and thoroughly before starting to
work.
•Observe all safety instructions and warnings in these Installation Instructions, and follow the
instructions.
•Store these Installation Instructions carefully, and so that it is accessible to the personnel at any
time.
•These Installation Instructions are a part of the product. When the switchgear is transferred, supply
these Installation Instructions as well.
•For questions about these Installation Instructions, please contact the regional Siemens
representative.
Any kind of modification on the product or alteration of the product must be coordinated with the manufacturer in
advance. Non-coordinated modifications or alterations can cause the expiration of warranty claims, and cause
danger to life, limb and other legally protected interests. The fulfillment of the type tests (according to IEC 62271
Part 200) may not be guaranteedanymore.This applies especially though not exclusively tothe following actions:
•Original Siemens spare parts were not used.
•Servicetechnicians performing replacement were not trained and certified by Siemens.
•Parts were fitted or adjusted incorrectly.
•Settings were not made in accordance with Siemens specifications.
•After installation and setting, nofinalcheckwasperformed by aservice technicianapprovedbySiemens,
including documentation of the test results.
•Maintenance was not done according to the Installation Instructions of the Siemens products.
The edition of the standard is only mentionedin thetestreport applicableat the time of switchgearmanufacture.
2.2 Five Safety Rules of Electrical Engineering
The Five Safety Rules of Electrical Engineering must generally be observed during operation of the products
and components described in these Installation Instructions:
•Isolate.
•Secure against reclosing.
•Verify safe isolation from supply.
•Earth and Short-circuit.
•Cover or barrier adjacent live parts.
2.3 Hazardous substances
If hazardous substances are required to perform the work, the relevant safety data sheets and operating
instructions must be observed.

General instructions
8 NXAIR / ≤40 kA 110-0084.9 / 15
2.4 Personal protective equipment (PPE)
The personal protective equipment must be determined by the switchgear operator depending on the work to
be performed at the switchgear and on the IAC classification of the switchgear. To select the personal
protective equipment, the local laws and regulations, among others, must be complied with.
If covers are opened or removed from a switchgear in operation, the IAC classification according to IEC
62271 Part 200 is no longer fulfilled. The switchgear operator must take this into account when selecting
personal protective equipment. In case of internal arc, full personal protection is then not provided, even if
the personal protective equipment is worn.
3 Due application
The air-insulated medium-voltage switchgear type NXAIR is a type-tested and metal-clad switchgear for indoor
installation, with type of accessibility A and internal arc classification (IAC): IAC A FLR ≤ 40 kA 1 s or IAC
A FL ≤40 kA 1 s according to IEC 62271 Part 200.
The switchgear can be used as indoor installation according to IEC 61936 (Power Installations exceeding
AC 1 kV) in lockable electrical service locations. A lockable electrical service location is a room or a place that
is exclusively used for installing electrical equipment and which is kept under lock and key. Access to such a
room is restricted to skilled electricians.
In the basic version, the degree of protection of the enclosure of NXAIR medium-voltage switchgear is IP3XD
according to IEC 60529.
When theswitchgear is operated withinthe technical parameters defined in these instructions, the air-insulated
switchgear type NXAIR is suitable for rated voltages up to Ur≤17.5 kV and a maximum rated short-time
withstand current of Ik= 40 kA.
The circuit-breaker to be used in a circuit-breaker panel must only be the Siemens type 3AE.
The air-insulated medium voltage switchgear type NXAIR is suitable for operational switching of AC circuits in
transformer substations of public power supply systems or in industrial plants.
The medium-voltage switchgear NXAIR is available with the panel types:
•Circuit-breaker panel
•Disconnecting panel
•Metering panel
•Contactor panel
•Busbar current metering panel
•Bus sectionalizer
•Busbar connection panel
•Switch-disconnector panel

General instructions
110-0084.9 / 15 NXAIR / ≤40 kA 9
4 Qualified personnel
Qualified personnel in accordance with these instructions are persons who are familiar with transport,
installation, commissioning, maintenance and operation of the product and have appropriate qualifications for
their work.
To get appropriate qualifications about transport, installation and commissioning, this personnel must have
taken part in a training for assembly and installation of air- insulated medium-voltage switchgear type NXAIR.
This installation training provides detailed information about design, operation, installation and trouble
shooting on the primary part of NXAIR switchgear. After successful participation, the participants in this
training get a certificate. This certificate authorizes the participants to install, assemble and connect this
medium-voltage switchgear electrically at their own responsibility.
For further information about this installation training, please contact:
Siemens AG
Smart Infrastructure
Siemens Power Academy TD
Humboldtstraße 59
90459 Nuremberg, Germany
Tel: [phone]
E-Mail: [e-mail]
Siemens Power Academy TD:
- Energy management
- Primary Technology
- Medium Voltage
- Switchgear Assembly & Installation
Fig. 1: Certificate (as an example)
Furthermore, qualified personnel must have the following training and instruction or authorization:
•Training and instruction or authorization to switch on, switch off, earth and identify power circuits and
equipment / systems as per the relevant safety standards
•Training and instruction regarding the applicable specifications for the prevention of accidents and the
care and use of appropriate safety equipment
•Training in first aid and behavior in the event of possible accidents

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Preparing installation
5 Preparing installation
INFORMATION
Read and understand these instructions before attempting installation works.
5.1 Preliminary clarifications
In order to load the transport units in a suitable installation order, the regional Siemens representative requires
the following information from you several weeks before delivering the switchgear:
•Sketch of the installation room including the locations and numbers of the individual panels and the
storage location for the accessories
•Sketch of the access route from the public road to the switchgear building and information concerning
the condition thereof (meadows, arable soil, sand, gravel, etc.)
•Sketch of the transport route inside the switchgear building with the locations and dimensions of doors
and other narrow points, as well as the floor number of the installation room
•Information about available lifting equipment, e.g. mobile crane, fork-lift truck, lifting truck, hydraulic
jack, roller pads. If no lifting equipment is available, please notify this explicitly
5.2 Switchgear room
Observe the following points when preparing the switchgear room:
•Base frame and switchgear dimensions
•Transport ways to the switchgear room
•Distribution and intermediate storage spaces
•Size of the room and the doors
•Construction and load-bearing capacity of the floor
•Illumination, heating, power and water supply
•Dimensions of installation scaffoldings and foundation rails
•Installation of high-voltage cables
•Earthing system
•Cleanliness: Switchgear room free of dirt and dust
5.3 Foundation
Please observe the following items when preparing the foundation:
•A suitable foundation can be a false floor, a double floor or a reinforced-concrete foundation. The
reinforced-concrete floor must be equipped with foundation rails for supporting the panels.
•As for design and construction of the foundation, the relevant standards DIN 43661
“Fundamentschienen in Innenanlagen der Elektrotechnik” (Foundation rails in electrical indoor
installations) and DIN 18202 “Maßtoleranzen im Hochbau” (Blatt 3)(Measuring tolerances in structural
engineering (Sheet 3)) apply.
•The dimensions of the floor opening and the fixing points of the switchgear frame are given in the
associated dimension drawings. These dimension drawings are made available by the regional
Siemens representative.
•If the foundation has to be resistant to earthquakes, additional points must be considered. Please seek
the corresponding information in time. Your regional Siemens representative will be pleased to give
you advice.
•Determine level differences between the installation surfaces of the panels using a measuring sheet,
and compensate these level differences with shims (0.5 mm to 1.0 mm).
•The foundation area in front of the high-voltage doors of the panels, on which the withdrawable parts
or switching-device trucks are approached, inserted and removed, must be at the same level as the
standing surface of the panels.
The panel version with/without rear duct has no influence on the fastening to the foundation.
The following illustrations show general measuring sheets. For further information, see information drawings
NXAIR, order number 110-2300.9.

Preparing installation
110-0084.9 / 15 NXAIR / ≤40 kA 11
Rated short-time withstand current Ik≤31.5 kA
Panel version
Busbar version [A]
Panel depth
complete [mm]
Standing surface without
high-voltage door [mm]
Circuit-breaker panel
≤2500
1350, 1500
1314
Disconnecting panel
Metering panel
≤2500
1350
1314
Busbar current metering panel
Bus sectionalizer
Busbar connection panel
Switch-disconnector panel
Contactor panel, panel width 435 mm
≤2500
1400
1363
Circuit-breaker panel
3150/4000
1500, 1540, 1650
1464
Disconnecting panel
Metering panel
3150/4000
1500
1464
Busbar current metering panel
Bus sectionalizer
Busbar connection panel
Contactor panel, panel width 435 mm
Switch-disconnector panel
Rated short-time withstand current Ik= 40 kA
Panel version
Busbar version [A]
Panel depth
complete [mm]
Standing surface without
high-voltage door [mm]
Circuit-breaker panel
3150/4000
1500, 1540, 1650
1464
Disconnecting panel
Metering panel
3150/4000
1500
1464
Busbar current metering panel
Bus sectionalizer
Busbar connection panel
Contactor panel, panel width 435 mm
Fig. 2: Measuring sheet for the foundation. Tolerance according to DIN 43661:
Straightness 1 mm/1 m length, 2 mm for the total length;
evenness 1 mm within 1 m measured length;
NXAIR version with Ik≤31.5 kA and busbar version up to 2500 A
(1)
Measuring
point on the
foundation
rails
1

Preparing installation
12 NXAIR / ≤40 kA 110-0084.9 / 15
Fig. 3: Measuring sheet for the foundation. Tolerance according to DIN 43661:
Straightness 1 mm/1 mlength, 2 mm for the total length;
evenness 1 mm within 1 m measured length;
NXAIR version with Ik≤31.5 kA and busbar version up to 2500 A
(with contactor panels)
(1)
Measuring point on the foundation rails
Fig. 4: Measuring sheet for the foundation. Tolerance according to DIN 43661:
Straightness 1 mm/1 mlength, 2 mm for the total length;
evenness 1 mm within 1 m measured length;
NXAIR version with Ik≤31.5 kA and busbar version up to 3150/4000 A
and NXAIR version with Ik= 40 kA
(with or without contactor panels)
(1)
Measuring point on the foundation rails
5.4 Dimensions of the switchgear room
DANGER
Incorrect installation
The installation of panels designed without evacuation duct in the pressure relief
duct is only permissible with the stipulated minimum room height given in the
following table. If the panel is installed in a switchgear room where the room height
is too low, the internal arcing behavior of the panels can be influenced in a negative
way, including hazard for the operator.
Check the room height according to the stipulations in the following table
before installing the switchgear.
In case of a deviating room height in the relation between the technical data
and the room height according to the following table, the installation of the
switchgear is not permissible.
1
1

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110-0084.9 / 15 NXAIR / ≤40 kA 13
To install the switchgear, the switchgear room must have certain minimum dimensions.
Depending on the room height, the pressure relief system of the switchgear must be designed with evacuation
ducts leading out of the switchgear building:
Height of switchgear
room [mm]
Rated voltage
Ur[kV]
Rated short-time
withstand current
Ik[kA]
Switchgear with
evacuation ducts
≥2500
≤17.5
≤40
Switchgear with
evacuation ducts
or absorber
≥2800
≤12
≤25
≥3000
≤12
31.5
≥3500
17.5
≤31.5
≥3500
≤17.5
40
5.5 Switchgear with absorber
Fig. 5: Dimensions of the switchgear room, absorber
1)
For panel replacement: Control aisle ≥1250 mm
2)
For connection from the rear: ≥500 mm; also valid with rear connection duct
For contactor panel with panel width 435 mm: ≥100 mm
For a panel depth of 1540 mm: ≥110 mm
For further information, see information drawings NXAIR, order number 110-2300.9.
B = panel width / T = panel depth
complete

Preparing installation
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5.6 Switchgear with evacuation ducts
Fig. 6: Dimensions of the switchgear room, evacuation duct
1)
For panel replacement: Control aisle ≥1250 mm
2)
For connection from the rear: ≥500 mm; also valid with rear connection duct
For contactor panel with panel width 435 mm: ≥100 mm
For a panel depth of 1540 mm: ≥110 mm
For further information, see information drawings NXAIR, order number 110-2300.9.
All parts of the evacuation duct are included in the scope of supply of the switchgear. The parts of the
evacuation duct are made of galvanized sheet steel, thickness 2 mm, with bolted joints M8-8.8.
The following parts can be interconnected and bolted together, cross-section 530x245 mm:
Adapter unit on standard pressure relief duct to the left
Adapter unit on standard pressure relief duct to the right
Adapter unit on standard pressure relief duct to the rear
For further information, see information drawings NXAIR, order number 110-2300.9.
Additional fixing elements must be provided locally.
As a rule, all type tests are performed according to IEC 62271-200 on representative switchgear panels. As
mentioned in this IEC, special type tests cannot be performed for all switchgear arrangements. Due to the
variety of types, rated values and possible component combinations, every specific arrangement can be
substantiated by test data or simulation calculations of comparable arrangements in accordance with the
standard. For this reason, and due to the fact that the switchgear rooms will never have exactly the same
dimensions, installed equipment, etc., the functionality of these evacuation systems has been evaluated by
means of type tests in connection with simulation calculations.
The evacuation duct must be implemented laterally or to the rear.
At least one panel of each busbar section (if bus sectionalizer available) must have one duct system connected
laterally or at the rear.
The length of the switchgear and the number of busbar components has no influence on the configuration of
the duct system.
Lateral evacuation duct:
The end panel (all available panel versions) used to adapt the evacuation duct must not contain any fittings for
busbar voltage transformers, busbar earthing switches or power supply bars/cables from above. Ventilated
panels are possible.
Evacuation duct to the rear:
The end panel used to adapt the evacuation duct must not contain any fittings for busbar voltage transformers,
busbar earthing switches or power supply bars/cables from above. Adaptation to an individual contactor panel
with panel width 435 mm is not possible, only in the middle between two contactor panels with panel
width 435 mm.
B = panel width / T = panel depth
complete

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110-0084.9 / 15 NXAIR / ≤40 kA 15
5.7 Intermediate storage
DANGER
Fire risk
Transport units are packed in flammable materials.
Keep fire extinguishers in a weatherproof place.
Mark the location of the fire extinguisher.
WARNING
Transport units falling over
Danger due to transport units falling over, or parts falling down if the storage space
is overloaded.
Observe the load-bearing capacity of the floor.
Do not stack the transport units.
WARNING
Overloading
While loading and unloading the means of transport and while moving the transport
units, there is risk of overloading the human body.
Use appropriate lifting equipment and floor conveyors.
At the place of installation, observe the valid limit values for lifting and
carrying.
Do not move transport units with bodily power.
Put on personal protective equipment.
NOTICE
Effectiveness of the desiccants
Supplied desiccant bags lose their effectiveness if they are not stored in the
undamaged original packings.
Do not damage or remove packing of desiccant bags.
Do not unpack desiccant bags before use.
If the delivered panels or parts thereof have to be stored before installation, a suitable storage room or place
has to be selected and prepared.
No condensation shall be possible in a suitable storage room; if necessary, air conditioning or heating systems
should be installed to avoid condensation.

Preparing installation
16 NXAIR / ≤40 kA 110-0084.9 / 15
5.8 Intermediate storage of the transport units
•In original packing as far as possible
•Observe permissible storage temperature from −25 °C to +70 °C.
•In a weatherproof place
•Protected against damage
•If packed in seaworthy crates, the switchgear can be stored for a maximum of 6 months (desiccant
bags) at a humidity of max. 60 %
•Store transport units in such a way that they can be taken out later in the correct order for installation.
As a rule, the panels should be stored in a closed room. The storage room must have the following
characteristics:
•Floor with adequate load-bearing capacity (weights as per delivery note)
•Even floor to enable stable storage
•Well-ventilated and as free of dust as possible
•Dry and protected against humidity and vermin (e.g. insects, mice, rats)
•Check humidity in the packing every 4 weeks (condensation)
•Do not unpack small parts to avoid corrosion and loss.
If the switchgear or parts thereof are delivered in seaworthy crates, these can be stored up to 6/12 months in
other rooms or outdoors. The storage location must have the following characteristics:
•Floor with adequate load-bearing capacity (weights as per delivery note)
•Protected against humidity (rain water, flooding, melting water from snow and ice), pollution, vermin
(rats, mice, termites, etc.) and unauthorized access
•Place all crates on planks and square timber for protection against floor humidity
•After 6 months of storage, have the desiccant agent regenerated professionally. To do this, ask for
expert personnel via the regional Siemens representative.
5.9 Accessories
The following accessories are available:
•Racking crank with protective shield for moving the withdrawable part / switching-device truck
•Push rod for closing/opening the circuit-breaker mechanically
•Hand crank with freewheel for charging the circuit-breaker manually
•Operating lever for feeder and busbar earthing switch
•Operating lever for the switch-fuse combination
•Racking tool for removable voltage transformers
•Double-bit key for low-voltage door
•Double-bit key for withdrawable part / switching-device truck
•Service truck for withdrawable parts
•Installation and operating instructions
•Craning angle
•Slip-on levers for shutter operation (set for left and right side)
•Additional service truck for withdrawable parts
•Wall-mounting holder for accessories
•Earthing accessories (for a panel width of 600 mm and 800 mm)
•Plug-in voltage indicator IEC 61243-5/VDE 0682, Part 415, LRM system
for capacitive voltage tap
•Test unit for voltage indicator
•Coupling unit, 64-pole - 3 m long connection between the withdrawable part / switching-device truck
and the panel for function testing
•Tin of Longterm 2 grease (used for contact system, earthing switch blades)
•Vaseline (used for busbar and earth connections)
•Grease Isoflex TOPAS L32 (used for shutter linkage, guide of withdrawable part /
switching-device truck)
•Sealing compound SIKAFLEX 221 (cartridge)
•Test equipment for pressure switch
•Phase comparison test units
•Electrician's ladder (e.g. for operation of the busbar earthing switch)
•Craning angles to lift the panel with a crane
•Drilling template

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110-0084.9 / 15 NXAIR / ≤40 kA 17
The actually delivered accessories depend on the respective switchgear version and the purchase order. For
detailed information about the actually delivered accessories, please refer to the packing lists.
5.10 Tools
Items required for correct installation:
•These instructions
•Measuring sheet of the base frame
•Lifting truck
•Several roller pads (reinforced rollers)
•Several strong boards
•Rope or chain with transport shackles
•Reinforcing bars, roller crowbars
•Torque wrench 8 to 20 Nm, 20 to 70 Nm
•Electrical or pneumatic screwdriver with a torque of 110 Nm
for hexagon head bolts M16
•Shims 0.5 mm to 1 mm
•Phase tape (L1, L2, L3, gn / ye)
•Plumb bob, nylon thread (kite string or similar)
•Wire brush, copper sponge
•Soft, lint-free cloths
•Brush, cleaning cloth
•Household cleaner
•WD-40 waterproof spray oil
Also useful tools:
•Building site distribution board for 400/230 V AC (50/60 Hz)
•Extensions for 230 V AC (50/60 Hz)
•Hydraulic jack (2 to 3 t for vertical and horizontal stroke)
•Sling ropes
•Transport rollers
•Various pieces of squared timber
•Step-ladders
•Work bench with vice
•1/2” and 3/8” ratchet spanners with various extensions
•Nuts for M8, M10, M12, M16 and M20
•Ring spanners size 8, 10, 12, 16 and 20
•Open end spanner size 19
•Hexagon socket head key size 6
•Various slotted-head or Torx screwdrivers
•Side cutter
•Water pump pliers
•Various crimping pliers, stripping pliers, flat nose pliers, universal pliers, pointed pliers, etc.
•Water level
•Guide string
•Scriber
•Try-square
•Tape measure
•Thickness gauge (measure the distance in switch-fuse combination)
•Vernier caliper
•Measuring instrument with test probes, measuring cables, clamp-type test probes
•Continuity tester (beeper)
•Site illumination
•Hand lamp
•Pocket lamp
•Vacuum cleaner
•Hammer drill

Preparing installation
18 NXAIR / ≤40 kA 110-0084.9 / 15
5.11 Comments on electromagnetic compatibility
To achieve appropriate electromagnetic compatibility (EMC), some basic requirements must be observedwhile
erecting the switchgear. This applies especially to the installation and connection of external cables and wires.
Basic measures for ensuring EMC are already taken during design and assembly of the switchgear panels.
Among other things, these measures include:
•The low-voltage compartment is an integral part of the panel, which means that the protection and
control devices with the internal wiring are metal-enclosed.
•Reliable earth connections of the frame parts via toothed contact washers or locking washers.
•Inside the panel, wires are laid in metal ducts.
•Spatial separation of sensitive signal wires from wires with high interference voltage levels.
•Limitation of switching overvoltages of inductive loads (e.g. relay or contactor coils, motors) by means
of protective circuits with diode, varistor or RC element.
•Within the low-voltage compartment, the secondary devices are mounted in defined zones.
•Shortest possible connection between corresponding modules in subracks.
•Consideration of the magnetic leakage fields of conductor bars and cables.
•Protection of subracks and wiring backplanes against interference by perforated shielding plates.
•Large surface bonding between all modules and devices as well as bonding to the earthing conductor
of the switchgear assembly.
These measures basically enable proper operation of the switchgear itself. The planner or operator of the
switchgear must decide whether additional measures are required depending on the electromagnetic
environment where the switchgear is installed. Such measures must be implemented by the installation
company in charge.
In an environment with heavy electromagnetic interference it may be necessary to use shielded cables and
wires for the externalconnections. This makes it possible to avoid interferences in the low-voltage compartment
and thus, undesired influences on the electronic protection and control or other automation devices.
Cable shields must be electrically bonded to be able to carry high frequencies, and contacted concentrically
at the cable ends.
The shields of cables and wires are connected and earthed in the low-voltage compartment.
Connect the shields to earth potential - with high electrical conductivity andallaround as far as possible. Protect
the contact surfaces from corrosion in case of humidity (regular condensation).
When laying cables into the switchgear assembly, separate the control, signaling and data cables and other
lines with different signal and voltage levels by laying them on separate racks or riser cable routes.
Corresponding to the different shield designs, there is a number of methods to perform connection. The
planning department or site management determines which of the methods will be used, taking EMC
requirements into account. The preceding points should always be taken into account.
The shield is connected to cables or wires with clamps contacting all around. If low demands are placed on
EMC, it is also possible to connect the shield directly to earth potential (combine or twist the shield wires) or
via short cable connections. Use cable lugs or wire-end ferrules at the connecting points.
Always keep the connecting leads of the shields as short as possible (< 10 cm).
If shields are used as protective earth conductors at the same time, the connected plastic-insulated lead must
be marked green/yellow over its entire length. Non-insulated connections are inadmissible.

Preparing installation
110-0084.9 / 15 NXAIR / ≤40 kA 19
5.12 Installation and fixing material without additional earthquake stabilization
Before installing the individual components, the installation and fixing material required has to be prepared.
NOTICE
Damages due to corrosion
Welded seams are susceptible to corrosion.
After welding, protect the welded seams professionally against corrosion.
Floor fixing versions:
Bolted
floor fixing
Welded
floor fixing
Foundation
possible
possible
Double floor
possible
not possible
Version with bolted floor fixing
Fig. 7: Bolted floor fixing
(1)
Upper edge of finished floor
(7)
Min. 90 mm
(2)
Floor fixing plate (holder for profiles at a
distance ≥1200 mm), Fig. 10 "Side view of the fixing
plate"
(8)
80 mm
(3)
C-profile CB 50 x 30 x 3, EN 10025, S235JR
(9)
Raw floor
(4)
Hook-head bolt M16x35-4.6-galvanized
Washer ISO 7094 - 16 - 100 HV
Hexagon nut ISO 4032 –M16 –8
(10)
Expansion dowel with hexagon
head bolt and washer: FAN 12/10
(5)
Base frame of panel
(11)
Floor finish
(6)
Min. 50 mm
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20 NXAIR / ≤40 kA 110-0084.9 / 15
Version with welded floor fixing
Fig. 8: Welded floor fixing
(1)
Upper edge of finished floor
(7)
Min. 90 mm
(2)
Base frame of panel
(8)
80 mm
(3)
Welding in fixing opening of base frame
(9)
Raw floor
(4)
U-profile U50, DIN 1026
(10)
Expansion dowel with hexagon
head bolt and washer, FAN 12/10
(5)
Floor fixing plate (holder for profiles at a
distance ≥1200 mm), Fig. 10 "Side view of the fixing
plate"
(11)
Floor finish
(6)
Min. 55 mm
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