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Are the 125A mccbs set at full or have they been adjusted down to a more sensible level?
Discuss Commercial sub mains exceed max zs of mccbs in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
Hi Dave this type is not adjustableAre the 125A mccbs set at full or have they been adjusted down to a more sensible level?
This statement to me gives the impression is all okay and maybe it is as fault protection is provided but the issue of selectivity is not clearly addressed. There is no selectivity between x and the supply protective device y whereby fault protection is provided by y. Or something along those lines.
Selectivity these days
Hello Arashabb this is an old thread so you need to create a new one.Hi Guys,
in an installation with one main Distribution board and several submain-DBs, do when you measure Zdb on a submain-DB incomer? and do we need to verify the Zdb value with the up stream protection device?( for example, a 125A, MCCB on the MDB outgoing). If yes, how can I get the max Zs values for MCCBs ?
Reply to Commercial sub mains exceed max zs of mccbs in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
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