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Do-It-Yourself (DIY) Question & Answer Forum
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<blockquote data-quote="DonkeyDong" data-source="post: 11170" data-attributes="member: 156"><p>Time to play dumb and see how many different answers we get <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p></p><p>DB1 fitted with an RCD as main isolator (30mA), MCB from here feeds sub main to DB2 (which none of this can be changed)</p><p></p><p>DB2 has sockets and lights fitted on various breakers.</p><p></p><p>You have only worked on DB2 fitting these lights/sockets</p><p></p><p>Questions...</p><p></p><p>1) Do you record the RCD disconnection times for each circuit you've worked on (bearing in mind there is no RCD on DB2) ? (if required by the EIC)</p><p></p><p>2) The Zs is too high on one of your circuits in DB2 - Do you care as there is an RCD upstream ?</p><p></p><p>3) DB1 MCB is 20A Type B, DB2 MCB is 16A Type C, without comparing the charastaristic/graphs in the brown (now red) book - would this cause a potential issue with discrimination with overcurrent ?</p><p></p><p>Its Friday night...let the fun begin! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /> </p><p></p><p>D.</p></blockquote><p></p>
[QUOTE="DonkeyDong, post: 11170, member: 156"] Time to play dumb and see how many different answers we get ;) DB1 fitted with an RCD as main isolator (30mA), MCB from here feeds sub main to DB2 (which none of this can be changed) DB2 has sockets and lights fitted on various breakers. You have only worked on DB2 fitting these lights/sockets Questions... 1) Do you record the RCD disconnection times for each circuit you've worked on (bearing in mind there is no RCD on DB2) ? (if required by the EIC) 2) The Zs is too high on one of your circuits in DB2 - Do you care as there is an RCD upstream ? 3) DB1 MCB is 20A Type B, DB2 MCB is 16A Type C, without comparing the charastaristic/graphs in the brown (now red) book - would this cause a potential issue with discrimination with overcurrent ? Its Friday night...let the fun begin! :D D. [/QUOTE]
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