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Dc Through Ac Mcb's
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<blockquote data-quote="Marvo" data-source="post: 399703" data-attributes="member: 20838"><p>What type of panel is this? Is it a DB or MCC? Is there any manufacturers paperwork for the panel or can paperwork be obtained? It's possible the cascaded coordination of protective devices allows the use of OCPD's with what looks like inadequate KA ratings for the PFC. There may also be zones that were designed as 'fault free' that could also allow this if certain criteria was met.</p><p></p><p>As for battery PFC your standard PFC or impedance testers won't help you, there's calc method outlined in IEC61660 which sdhould be acceptable.</p><p></p><p>TBH this isn't the kind of design or remedy you should be responsible for, if you've got an engineer involved then you've done what you should.</p></blockquote><p></p>
[QUOTE="Marvo, post: 399703, member: 20838"] What type of panel is this? Is it a DB or MCC? Is there any manufacturers paperwork for the panel or can paperwork be obtained? It's possible the cascaded coordination of protective devices allows the use of OCPD's with what looks like inadequate KA ratings for the PFC. There may also be zones that were designed as 'fault free' that could also allow this if certain criteria was met. As for battery PFC your standard PFC or impedance testers won't help you, there's calc method outlined in IEC61660 which sdhould be acceptable. TBH this isn't the kind of design or remedy you should be responsible for, if you've got an engineer involved then you've done what you should. [/QUOTE]
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