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Electrical Inspection & Testing Forum
Zs = Ze +(R1 + R2) Where am I going Wrong
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<blockquote data-quote="gazza96" data-source="post: 72137" data-attributes="member: 993"><p>Guys,</p><p></p><p>Many thanks for your replies, as it was a TT system and as most of my work is on TNS TNC-S (city boy) I looked at the OSG for inspiration about the Zs, Appendix 2 (Pages 100-102), I noted that Tables 2A, 2B and 2C all mention for TN systems, so thought that table 2D must be covering TN &amp; TT as its title doesn't mention either. I can't find table 41.5 from the Regs in the OSG</p><p></p><p>Anyway, the circuit I installed did have a 30mA RCD (sorry, forgot to mention that) as protection, and I have found that when doing testing my calculations aren't always the exact same as the measured reading, but as long as i'm in the region and not widely off I take it as being ok</p><p></p><p>Once again thanks for the help</p><p></p><p>Gazza</p></blockquote><p></p>
[QUOTE="gazza96, post: 72137, member: 993"] Guys, Many thanks for your replies, as it was a TT system and as most of my work is on TNS TNC-S (city boy) I looked at the OSG for inspiration about the Zs, Appendix 2 (Pages 100-102), I noted that Tables 2A, 2B and 2C all mention for TN systems, so thought that table 2D must be covering TN & TT as its title doesn't mention either. I can't find table 41.5 from the Regs in the OSG Anyway, the circuit I installed did have a 30mA RCD (sorry, forgot to mention that) as protection, and I have found that when doing testing my calculations aren't always the exact same as the measured reading, but as long as i'm in the region and not widely off I take it as being ok Once again thanks for the help Gazza [/QUOTE]
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Zs = Ze +(R1 + R2) Where am I going Wrong
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