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C40A Tp Mcb, High Zs
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<blockquote data-quote="mooseoff" data-source="post: 392979" data-attributes="member: 26274"><p>Hi, </p><p></p><p>I have a C40A three phase circuit (final) with a measured Zs of 0.8 Ohms (0.55 max). Obviously this is too high as per table 41.3. The supply is a TN-C-S with a measured Ze of 0.71. Obviously the R1+R2 should be around 0.09, and low and behold was measured as such. There is a 300mA RCD in place adjacent to the 3 phase supply cutout (300mA due to sensitive equipment and requirement for no nuisance tripping as its a remote site) </p><p></p><p>There is additional protection afforded via a supplementary equipotential bonding conductor to the equipment. </p><p></p><p>My query is does this pass to issue a cert? I'm not the one signing anything of btw, just want to expand my knowledge. </p><p></p><p>Cheers Chaps</p></blockquote><p></p>
[QUOTE="mooseoff, post: 392979, member: 26274"] Hi, I have a C40A three phase circuit (final) with a measured Zs of 0.8 Ohms (0.55 max). Obviously this is too high as per table 41.3. The supply is a TN-C-S with a measured Ze of 0.71. Obviously the R1+R2 should be around 0.09, and low and behold was measured as such. There is a 300mA RCD in place adjacent to the 3 phase supply cutout (300mA due to sensitive equipment and requirement for no nuisance tripping as its a remote site) There is additional protection afforded via a supplementary equipotential bonding conductor to the equipment. My query is does this pass to issue a cert? I'm not the one signing anything of btw, just want to expand my knowledge. Cheers Chaps [/QUOTE]
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C40A Tp Mcb, High Zs
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