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MVA to Ka - What device is acceptable?
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<blockquote data-quote="Sidewinder" data-source="post: 442978" data-attributes="member: 9512"><p>There is definitely some confusion somewhere.</p><p></p><p>Are you sure that you don't have a 25MVA tx, with a 25kA fault level.</p><p></p><p>25kA is about right for a "normal" 400A DNO supply.</p><p></p><p>Thus you need MCCB's or fuses until your fault level decreases below that which can be coped with by MCB's, else you will be relying on backup protection, and you should be changing any breaker that trips, every time it trips.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 442978, member: 9512"] There is definitely some confusion somewhere. Are you sure that you don't have a 25MVA tx, with a 25kA fault level. 25kA is about right for a "normal" 400A DNO supply. Thus you need MCCB's or fuses until your fault level decreases below that which can be coped with by MCB's, else you will be relying on backup protection, and you should be changing any breaker that trips, every time it trips. [/QUOTE]
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