Talk:Circuit-breaker ( full page )/Archive 1: Difference between revisions
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(Created page with 'Hello I think, that there is made a mistake by 'Rated impulse-withstand voltage (Uimp)' For industrial devices we can really speak about Uimp=8kV, if we speak about overvoltag…') |
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Revision as of 08:40, 29 June 2012
Hello
I think, that there is made a mistake by 'Rated impulse-withstand voltage (Uimp)'
For industrial devices we can really speak about Uimp=8kV, if we speak about overvoltage category IV and nominal voltage 690V. But domestic devices standard do not know voltages over 3x400 V and highest overvoltage category there is III. So - correct 'usual' Uimp by those installation is 4 kV. Some (selektive) Main CB-s are rather exceptions of that rule.
BR
trebla
