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rcbo type c good or bad for domestic
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 30760" data-attributes="member: 250"><p>I presume you are calcing your 3.06 as the 80% of the value from table 41.3 pg 49 Big Red book???</p><p></p><p>i.e. 3.83 x 0.8 = 3.064.</p><p></p><p>as Mr S says the O.S.Guide table 2D pg 103 lists max Zs as 3.09</p><p></p><p>So the actual answer to your question is Yes TypeC 6A RCBO is ok... Also assuming any other relevant correction factors have been applied to your Max ZS. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>as a rough quick calc... lets say max Zs 3.00.</p><p></p><p>TN-S &amp; Ze = 0.8 Max R1+R2 3.00 - 0.8 = 2.2</p><p></p><p>2.2 with 1.0mm T&amp;E is 60.7m</p><p></p><p>2.2 with 1.5mm T&amp;E is 72.8m</p><p></p><p>TN-C-S &amp; Ze = 0.35 Max R1+R2 3.00 - 0.35 = 2.65</p><p></p><p>2.65 with 1.0mm T&amp;E is 73.2m</p><p></p><p>2.65 with 1.5mm T&amp;E is 87.7m</p><p></p><p>Again as Mr S said.... those Zs values would be a quite long lighting circuit for a domestic environment??????</p><p></p><p>whichever earth type and/or cable size used ALL 60m+!!! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> ; )</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 30760, member: 250"] I presume you are calcing your 3.06 as the 80% of the value from table 41.3 pg 49 Big Red book??? i.e. 3.83 x 0.8 = 3.064. as Mr S says the O.S.Guide table 2D pg 103 lists max Zs as 3.09 So the actual answer to your question is Yes TypeC 6A RCBO is ok... Also assuming any other relevant correction factors have been applied to your Max ZS. :) as a rough quick calc... lets say max Zs 3.00. TN-S & Ze = 0.8 Max R1+R2 3.00 - 0.8 = 2.2 2.2 with 1.0mm T&E is 60.7m 2.2 with 1.5mm T&E is 72.8m TN-C-S & Ze = 0.35 Max R1+R2 3.00 - 0.35 = 2.65 2.65 with 1.0mm T&E is 73.2m 2.65 with 1.5mm T&E is 87.7m Again as Mr S said.... those Zs values would be a quite long lighting circuit for a domestic environment?????? whichever earth type and/or cable size used ALL 60m+!!! :o ; ) [/QUOTE]
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