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Does a DNO 30mA RCD Isolator satisfy 411.4.204 (411.3.2.2)
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 510351" data-attributes="member: 250"><p>IMHO you are worrying about the wrong problem....</p><p></p><p>Unless this is a really really big property..</p><p></p><p>which I am guessing it isn't, (as only 4-way wylex box)..</p><p></p><p>I would be very worried if max Zs for some 60898's cannot be met on a domestic TN-s system?</p><p></p><p>e.g. a 6A 60898, type B Max Zs 7.28.. (table 41.3 pg 62)</p><p></p><p>so lets minus off 0.8 worth of possible Ze for a TN-S..</p><p></p><p>that gives us 6.48ohms worth of R1+R2 portion of the Max Zs.. (R1+R2=Zs-Ze)</p><p></p><p>So 6.48ohms is around 179m of 1.0mm/1.0mm T&amp;E, </p><p></p><p>Or 214m of 1.5mm/1.0mm T&amp;E...</p><p></p><p>{on a lighting circuit}... </p><p></p><p>150+ Meters is a BIG domestic lighting circuit!!!</p><p></p><p>How BIG is this house??</p><p></p><p>(Do the sums for 16A / 32A 2.5mm &amp; 6.0mm)...?</p><p></p><p>If you cant get your Zs on a domestic TN-s, then as Murdoch say's, it needs FI..</p><p></p><p>Not a cowboy get out of jail 30ma RCD card!!!!</p><p></p><p>P.S.</p><p></p><p>How are you meeting 314.1 (i) with just a single 30ma upfront RCD?</p><p></p><p> :C </p><p></p><p></p><p></p><p></p><p>Agreed..</p><p></p><p>No need for tin hat IMHO!</p><p></p><p> Guinness</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 510351, member: 250"] IMHO you are worrying about the wrong problem.... Unless this is a really really big property.. which I am guessing it isn't, (as only 4-way wylex box).. I would be very worried if max Zs for some 60898's cannot be met on a domestic TN-s system? e.g. a 6A 60898, type B Max Zs 7.28.. (table 41.3 pg 62) so lets minus off 0.8 worth of possible Ze for a TN-S.. that gives us 6.48ohms worth of R1+R2 portion of the Max Zs.. (R1+R2=Zs-Ze) So 6.48ohms is around 179m of 1.0mm/1.0mm T&E, Or 214m of 1.5mm/1.0mm T&E... {on a lighting circuit}... 150+ Meters is a BIG domestic lighting circuit!!! How BIG is this house?? (Do the sums for 16A / 32A 2.5mm & 6.0mm)...? If you cant get your Zs on a domestic TN-s, then as Murdoch say's, it needs FI.. Not a cowboy get out of jail 30ma RCD card!!!! P.S. How are you meeting 314.1 (i) with just a single 30ma upfront RCD? :C Agreed.. No need for tin hat IMHO! Guinness [/QUOTE]
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Does a DNO 30mA RCD Isolator satisfy 411.4.204 (411.3.2.2)
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