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Student & Learning Zone - City & Guilds
Testing a TT System max ZS
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<blockquote data-quote="binky" data-source="post: 502563" data-attributes="member: 490"><p>it is a bit confusing. Whilst 1667Ohms is acceptable with a 30mA RCD, I've always wworked on the basis that your dead test R1 + R2 figures should be as per expected for TN-S, and then add the rod figure. To me, the ccts are no different to any other earthing system, so you would expect the test results to match as a demonstration that your cct is good and you haven't got any loose connections or insulation faults anywhere.</p></blockquote><p></p>
[QUOTE="binky, post: 502563, member: 490"] it is a bit confusing. Whilst 1667Ohms is acceptable with a 30mA RCD, I've always wworked on the basis that your dead test R1 + R2 figures should be as per expected for TN-S, and then add the rod figure. To me, the ccts are no different to any other earthing system, so you would expect the test results to match as a demonstration that your cct is good and you haven't got any loose connections or insulation faults anywhere. [/QUOTE]
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Testing a TT System max ZS
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