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Student & Learning Zone - City & Guilds
R1 + R2 readings
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<blockquote data-quote="boltonsparky" data-source="post: 507481" data-attributes="member: 4678"><p>One theoretical example: Old house, central heating pump has a FCU, You test Zs at that point, reading within spec for the protective device. Deduct Ze from Zs, fill out your R1+R2 on the cert. A week later along comes the plumber and puts a load of plastic pipe in. you're unlikely to go back again for another 5 years but say you did go back after the plumber, do your Zs again open circuit because the cpc has been open circuit all along but you were getting a reading through the earthed metallic pipework which the plumber has kindly now removed..</p><p></p><p>You haven't proved continuity of conductors doing it the way you mention. You could be getting a Zs reading from a parallel path that could later be removed. Most of all it's just lazy, do your R1+R2 or R2 properly.</p></blockquote><p></p>
[QUOTE="boltonsparky, post: 507481, member: 4678"] One theoretical example: Old house, central heating pump has a FCU, You test Zs at that point, reading within spec for the protective device. Deduct Ze from Zs, fill out your R1+R2 on the cert. A week later along comes the plumber and puts a load of plastic pipe in. you're unlikely to go back again for another 5 years but say you did go back after the plumber, do your Zs again open circuit because the cpc has been open circuit all along but you were getting a reading through the earthed metallic pipework which the plumber has kindly now removed.. You haven't proved continuity of conductors doing it the way you mention. You could be getting a Zs reading from a parallel path that could later be removed. Most of all it's just lazy, do your R1+R2 or R2 properly. [/QUOTE]
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Student & Learning Zone - City & Guilds
R1 + R2 readings
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