IEC 61439 Standard in Electrical Busbar systems

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IEC 61439 Standard inElectrical Busbar systems
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• Preface
• In the Electrical manufacturing industry
  Standards which define clear rules are
  extremely necessary for safety, proper
  functioning to ensure quality at all levels.
  All the rules and recommendation under standards
  have been derived through extensive real world
  testing which assures correct or proper
  functioning of an electrical installation.z
• Not adhering to standards can result into grave
  electrical hazard affecting the end user.
  Following standards ensures safe operation of the
  electrical installation for many years.
• Introduction
• The IEC/EN 61439 is the result of the work of
  technical committees and subcommittees composed
  of representatives of the full member national
  electrotechnical committees in Europe, each
  dealing with a particular subject in the entire
  range of Electrical products and assemblies.
• IEC standard 61439 covers low voltage switchgear
  and control gear assemblies. It is a replacement
  for the earlier IEC standard 60439 and is now the
  industry standard requirement for all low voltage
  switchgear and control gear panel assemblies. The
  new standard gives details on the requirements of
  products through testing and other verification
  methods especially at pre design stage.

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How does this new standard add value to the OEM,
Consultant, Designer and Panel Builder?
Why was the new standard created? In the earlier
IEC standard 60439, Design verification was
excluded, and therefore the respective roles of
equipment manufacturers and panel builders were
not clearly defined, so responsibility for
ensuring compliance was equally difficult to
pinpoint. .

• The designer, be it from the consultant, OEM or
  the Panel builder identifies the needs and
  constraints for design, installation, operation
  and up-gradation of the complete system right at
  the design stage.
• He chooses the correct switch gear, cables,
  connectors, busbar products and other components
  as per the specifications that he intends to use
  in his final assembly. Before he takes it up for
  manufacturing, at the design stage itself he
  needs to be sure that his choice of components
  are proper and that when the components are
  fitted in the control panel or Distribution panel
  that they follow the IEC 61439 standard.
• To ensure this the designer carries out the
  design verification by various software tools
  provided by manufacturer which allows the
  electrical designer to be sure of his
  installation at an early stage.
• 1) The verification of the design by actual
  testing himself or by third party labs by the
  calculation via prescribed tools supplied by the
  product manufacturer.
• 2) Proper documentation of this design
  verification (e.g. test documentation,
  calculations) is then made by the prescribed
  tools provided by the manufacturer.

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General information about IEC - 61439

• The panel builder thus is not only responsible
  for the completed assembly but also responsible
  for
• The rating of the switchgear assembly
  according to the customer requirements.
• The compliance with the design verification
  of the original manufacturer.
• The declaration of conformity to the
  customer (Declaration of Conformity)
• The marking and documentation of the
  assembly
• The performance of the design verification
  and documentation

• In IEC 61439 three verification methods are
  recommended
• First by test
• Second by comparisons
• Third with reference to design by assessment.
• This covers Assemblies integrated for Generation,
  Transmission Distribution of Electrical Energy
  and assemblies designed for Electrical equipment
  all in the voltage range not exceeding 1000V AC
  or 1500V DC.

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Wöhner Busbar System and IEC 61439 standards

• Wöhner has been synonymous with top performance
  and innovation in technology for over 88 years.
  With over 100 registered patents, the Wöhner
  group is well established worldwide as a
  competent and reliable partner for energy
  distribution, control technology and renewable
  energies.
• Wöhner has made it easier for electrical
  designers to adopt the new standard through
  verification methods by specially designed
  software tools on their website, which can be
  used for saving costs need for additional
  testing.
• Short circuit strength Pre calculated tested
  by third party (avoids own testing requirements)
• Temperature rise test Pre calculated tested by
  third party (avoids own testing requirements)
• Current insulation Creep-age distance and
  isolation voltage pre-tested according to
  standards
• Dielectric strength By specification in product
  data sheet ( Flexible Busbar )
• If short circuit values are not taken in to
  consideration, during electrical fault there
  would be a serious fire hazard, harmful to
  everyone.
• Wöhner provides the current carrying capacity of
  the busbar and short circuit withstand capability
  of the system by calculation method with special
  tools on the website.

Cross Board Classic
60 Classic
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1. Tools for achieving IEC 61439

• Wöhner provides following free online tools which
  can be used by designer/planners verify their own
  design and confer to all the standards under IEC
  61439
• 1) Software for own design verification making
  the installation IEC complaint
• 2) Configurator tool to design and achieve the
  required Short circuit withstanding capability
• 3) Current carrying capacity of a Busbar
  busbar holder with respect to temperature of
  busbar enclosure
• 4) Di-electric strength of the assembly of
  Busbar in the electrical enclosure

Software for own design verification making the
installation IEC complaint
Wöhner provides special software which can be
accessed under their website menu Tools where
designer can fill up the Verification by
comparison with a reference construction using
the checklist under this tool. And documentation
can be made for final submission to end user
conferring to IEC requirements.
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2. Configurator tool to design and achieve the
required Short circuit withstanding capability

• A snap shot of configurator tool to achieve
  desired level of short circuit rating
• Wöhner configurator tool can be used to construct
  the power distribution and to achieve and
  maintain the desired short circuit withstanding
  capability of the system

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3. To measure the Short circuit carrying capacity
of a Bus bar system 

• We can check short circuit strength of a Busbar
  system by the design tools provided by Wöhner by
  the following simple steps
• The short circuit strength mainly depends on few
  parameters like size of the busbar, number of
  supports and distance between the busbar
  supports.
• Example
• Using the design tools by Wöhner we select the
  busbar support in the 60Classic 3P range (01500
  Wöhner part number) busbar size of 20mmx10mm,
  Decide that we will be using two numbers of
  busbar supports and that the distance between
  number of supports will be 300 mm by giving these
  inputs in the design tools we receive the short
  circuit strength of 53 KA. (refer screen shot 1)

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• If we now change the distance between busbar
  support from 300 mm to 450 mm by maintaining all
  other parameters same we receive short circuit
  strength as 43 KA.

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4. Current carrying capacity of Busbar systems by
design tools

• We can check the Current carrying capacity of
  the Busbar systems by the design tools provided
  by Wöhner by the following simple steps.
• The current carrying capacity of Busbar depends
  upon the Air temperature allowable inside the
  electrical cabinet and Busbar temperature that
  the end User has prescribed as Safe to use.
• On the Wöhner website, we need to select the size
  of the busbar, temperature of air permissible in
  the electrical panel based upon the user
  specifications and allowable temperature of
  busbar as desired by the designer and allowed by
  the end user. By giving these inputs we can get
  the current carrying capacity of the Busbar.

For example if we select busbar to be of the size
20mm x10mm, with a length of 2.4m (Wöhner item
code -01624), and if we select air temperature of
35C and busbar temperature of 85C, we will get
the current carrying capacity 652A. (refer screen
shot 3)
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• Now if we keep the size of the busbar and busbar
  temperature as constant and change the allowable
  air temperature from 35C to 55C. We will then
  receive the calculation of the current carrying
  capacity of the Busbar to be 508 A.

An actual application photo of the control panels
using Wöhner products.
With Wöhner products, Usage verification can be
done right at the stage of design, Thus by using
the IEC 61439 standard and with the examples
mentioned above the Designer and the OEM
manufacturer and the Electrical panel builder can
design very good quality products. The End User
is then provided a system which he can trust and
be ensured about the Safety and reliability,
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Other features of Wöhners unique Busbar
solutions

• Innovative design by Wöhner allows mounting of
  electrical switch gear directly on busbars saving
  expensive real estate in the electrical panel.
  Wöhner products guaranty safety ease of
  assembly to our customers making the Assembly
  time reduce to 1/3rd of the conventional
  assembly time.
• Copper Busbars are connected to cables LV
  switchgear (100A-1000A) without drilling the
  Busbars. Well-designed mounting adapters cable
  clamps provide a systematic compact power
  distribution panel along with all features like
  safety, ease of assembly, ease of maintenance,
  etc.

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• Conclusions
• Electrical wiring design are the most critical
  part of any electrical installation. Wöhner
  Busbar system solution are uniquely designed as
  per IEC 61439 standard, and provides for free
  risk free compliance to standard with best
  safety, quality cost saving.
• Farook Merchant - MD Messung Group (Mega
  Distributor for Wöhner Products in India.)
• Working with world class standards brings
  International Quality to control panels
  manufactured by our customers. We are able to
  specify, test guarantee to our customer
  Critical specifications like Short circuit
  currents, temperature rise di-electric strength
  as per IEC 61439 standard. This new standard
  gives details on the requirements of Wöhner
  products through testing and other verification
  methods. It is intended to make up for some of
  IEC 60439s shortcomings.
• Shrikanth Venkateshappa - International Key
  Account Manager, Wöhner.

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THANK YOU

• Contact us
• info_at_messung.com 020 6649 2800

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