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Do-It-Yourself (DIY) Question & Answer Forum
TT system
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<blockquote data-quote="binky" data-source="post: 485154" data-attributes="member: 490"><p>In theory on a 30mA RCD max Zs could be 1667 Ohms. However to me that means a cct / earrh rod is ******** somewhere! So on TT I work on the basis that R1+R2 values should be as per house with suppliers earth. Rod should be less than 200 Ohms - recomended figure for a stable earth, so as you have done above add your Rod to your R1+R2 figures to give you Zs.</p></blockquote><p></p>
[QUOTE="binky, post: 485154, member: 490"] In theory on a 30mA RCD max Zs could be 1667 Ohms. However to me that means a cct / earrh rod is ******** somewhere! So on TT I work on the basis that R1+R2 values should be as per house with suppliers earth. Rod should be less than 200 Ohms - recomended figure for a stable earth, so as you have done above add your Rod to your R1+R2 figures to give you Zs. [/QUOTE]
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