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PascalL

The short-circuit withstand indicated in your example 50KA/1s is linked to the maximum short-circuit of the main supply generally corresponding to the Icc of the MV/LV transformer. If you want to specify an internal arc performance, you can specify: IP arc minimum 50KA/1s ; assumption the internal arc isn’t interrupted by any SCPD (short-circuit protective device) IPc arc 50KA, assumption the internal arc is interrupted by a SCPD This specification need to be referred to the IEC TR 61641 and the assembly shall be tested according to this TR. In your example 50KA/1s, the assembly Prisma from Schneider-Electric has been tested to IPc arc 50KA and so in accordance to the requirement. The assembly OKKEN from Schneider-Electric has been tested to IP arc 100KA/1s and so in accordance and exceeding to the requirement. Hoping this answer will help you, with my best regards, Pascal LEPRETRE

PascalL · ‎2020-09-15

To comply and get a certification according to IEC61439-1/2 it is not a menu "a la carte". It is not allowed to choice the test that you are ready to perform. You need to perform ALL the tests required by the standard. it was the concept of the IEC60439 authorizing to be partially type tested. This concept was killed with the IEC61439. If competitors try to speak and present tests reports according to IEC61439 against a certificate IEC61439 you are not comparing apple to apple. You can be sure they are trying to avoid some difficult performances hiding some of them. You have to be proud of your certificate and don't hesitate to explain the much more value compared with tests report. Pascal Lepretre, Edison expert.

PascalL · ‎2020-09-15

The current transformer CT installed on busbars, links between main busbar and devices have no voltage on terminals. That the reason why their terminals are not insulated. To the voltage transformer or power transformer usually they are not installed into the form 4b, because it is not a standard installation the place is lacking. They are installed into an auxiliary area and in any case their terminals are insulated. Pascal Leprêtre.

PascalL · ‎2020-07-02

I had the opportunity to share and discuss with about the birth of the IEC61439 series. The evolution never stop and since 2020 May, the edition 3 of the IEC61439-1 (general rules) has been published. But because this standard has no secret for you, you understood you need to wait the next publication of the additional part. First one should be the IEC61439-2 still in the IEC process but should be published this year. Sure, we will have additional opportunities to discuss about that. In any case, feel free to have a look on the existing publication of this standard and have a look to: https://go.schneider-electric.com/WW_202005_IEC61439-Webinar-Replay-Gated-Content_EA-LP.html?source=Content&sDetail=IEC61439-Webinar-Replay-Gated-Content

PascalL · ‎2020-04-21

Hello, Based on markets (buildings or critical sites), Most of customers prefer to keep the cross section for the full current or to have the same or above current busbar compare to the main incoming section. The diversity factor is mainly used to distribution busbar Because we know the loads and so the rating of the different outgoing running at the same time. In that case we case define and use a diversity factor. Pascal Lepretre Standardization Officer - Edison Expert

PascalL · ‎2020-04-21

Question from Conrad: Is the rated diversity factor applicable for sizing the main horizontal busbar?

PascalL · ‎2020-04-21

Hello, If the system is designed by an original manufacturer, and certified IEC 61439, the system I supposed need to be installed based on a specific documentation. This documentation has been established to guarantee and keep the IEC 61439 performance. In case of doubt additional document as "conformity declaration" can be provide to asset this additional topic. Pascal Lepretre Standardization Officer - Edison Expert.

PascalL · ‎2020-04-21

Question from Alvin, Is it logical or allowed to install thermal monitoring into the busbar compartment? does it affect the type test?

PascalL · ‎2020-04-21

Hello, If the assembly manufacturer used a system from an original manufcaturer and respect the rules from his documentation he would not have to perform additional test. If there are some deviation(s) based on the comparison between the certification and the assembly to deliver yes additional tests can be performed. Pascal Lepretre Sytandardization Officer - Edison Expert

PascalL · ‎2020-04-21

Question from Georgios Andreadis: So, we have the right to request verification tests of our specified assembly from the panel builder for every project, before site installation?

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Re: internal arc withstand

Re: Explain who can issue certificate and is there a way to check creteria for certificate as per IEC

Re: Does the ,CT/VT's which is located on busbar before the main circuit breaker, need to have covers on secondary connection...

IEC 61439 standards, next publications are in the pipe

Re: [IEC 61439 for LV equipment April 16th 2020 webinar] - diversity factor

[IEC 61439 for LV equipment April 16th 2020 webinar] - diversity factor

Re: [IEC 61439 for LV equipment April 16th 2020 webinar] - Thermal monitoring on busbar

[IEC 61439 for LV equipment April 16th 2020 webinar] - Thermal monitoring on busbar

Re: [IEC 61439 for LV equipment April 16th 2020 webinar] - Specifications

[IEC 61439 for LV equipment April 16th 2020 webinar] - Specifications

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