Telephone: +41 22 02 11 Telefax: +41 22 03 00 E-mail: [email protected] Web: INTERNATIONAL. STANDARD. IEC. Third edition. So how many are aware of the difference between these two Standards? I had these highlighted to me a few years ago and it was news to me. BS EN applies to circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which.
|Published (Last):||7 September 2017|
|PDF File Size:||17.88 Mb|
|ePub File Size:||8.7 Mb|
|Price:||Free* [*Free Regsitration Required]|
Detailed information you can find following the link, pages 2 and 3: Want access to British Standards? The history of standard IEC may have something to do with it. And for prescribers to specify what CBs will be used for and then to check the standard for that use. Dear Amey, If I understood your question well, the difference comes from ratio of nominal Icn and ultimate Icu breaking capacities ratio to service breaking capacity Ics. For certain specific applications for example traction, rolling mills, marine service particular or additional requirements may be necessary.
I had these highlighted to me a few years ago and it was news to me. The concept behind it as it evolved in ss was a single standard for all low-voltage switchgear.
Understand that is making capacity and not Short Circuit capacity. The most suitable solution for use are MCBs certified with both standards as their performance meets requirements of use for residential installations and high enough for use in industry and infrastructure applications.
I am confused with two standards for the same breaker. With additional requirements for integrally fused circuit-breakers.
BS EN 60947-2:2017
Reply Hello Lim, It is higher because of hs Icu breaking capacity ratio to service breaking capacity Ics, eg. You can view our current job opportunities, apply online or send a spontaneous application here: As for IECit relates to the a. And I did engineering from electronics and communication in Example of Resi9 and Eazy9 circuit breakers for residential applications.
These are all written into the Standard so if you are installing MCBs in to areas 660947-2 a Polution Level 3 then that circuit breaker is not fit for purpose. Reply Stephen, the Max Zs value is not always published in technical guides.
Discussion in ‘ Industrial Electrician Talk ‘ started by essexSep 3, Thanks Reply Thank you for the useful infprmation. Dear Koks, Yes it is safe choice. The requirements for modular residual current devices without integral current breaking device are contained in Annex M. Is there more in fn
Really very useful information. The requirements and test methods for electromagnetic compatibility of circuit-breakers are contained in Annex J.
Stil… 1 Can we say it is for industrial application if a MCB manufactured as per IEC only 2 According to these standards any manufacturers could provide life time warranty.
Yes Hagar and Eaton will make devices to both Standards so when filling out certs we should be stating MCBs are installed. You should contact the technical support of Schneider Electric in your country. Example of Acti9 circuit breaker used for buildings and industry applications. This is the reason why manufacturers in addition provide a wide scope of fn curves: The Red document status indicator een that the document is an old version The document has likely been withdrawn by the publisher, also the meta data presented here may be out of date as it is no longer being maintained by the editorial teams at NBS.
In any case it will break 15kA. My thinking is that by nature AC signals reverse polarity each rn and therefore it would not matter which way the MCB was wired. MarvoSep 3, Good luck for your job search!
BS EN Low-voltage switchgear and controlgear. Circuit-breakers
Reply I am confused with two standards for the same breaker. Stephen, the Max Zs value is not always published in technical guides. The standard states that the top rated current is A, while the lowest is 6A and maximum value of rated short-circuit capacity Icn is 25kA. Do you already have an account? What this A or A meaning. Which is basically clean room heated 30 degrees domestic and office environments. All in all there are so many interrupting ratings that I am so confused.
IEC AND IEC a tale of two standards
Typically IEC certified CBs meet minimally required performance to proof proper protection of household installations: Also as i am new, how 60947- i calculate 60974-2 trip current? Pollution degree 2, impulse voltage 4kV, isolation voltage is the same as nominal voltage V. View the Blogger Directory. Reply Dear Amey, If I understood your question well, the difference comes from ratio of nominal Icn and ultimate Icu breaking capacities ratio to service breaking capacity Ics.