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Electrical Inspection & Testing Forum
Zs = Ze +(R1 + R2) Where am I going Wrong
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<blockquote data-quote="Andy™" data-source="post: 72074" data-attributes="member: 2012"><p>and if you pay closer attention to the Zs tables, it says its for TNCS and TNS. TT has completely different Zs values, which are upto 1667 ohms where a 30mA RCD is used...</p><p></p><p>try BRB, table 41.5, and 411.5.3, both page 50</p><p></p><p>but Zs on TT is generally lower than Ze + R1R2 due to parallel paths, sometimes exactly Ze+R1R2, but if its higher then i think there may be a loose connection somewhere</p></blockquote><p></p>
[QUOTE="Andy™, post: 72074, member: 2012"] and if you pay closer attention to the Zs tables, it says its for TNCS and TNS. TT has completely different Zs values, which are upto 1667 ohms where a 30mA RCD is used... try BRB, table 41.5, and 411.5.3, both page 50 but Zs on TT is generally lower than Ze + R1R2 due to parallel paths, sometimes exactly Ze+R1R2, but if its higher then i think there may be a loose connection somewhere [/QUOTE]
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Zs = Ze +(R1 + R2) Where am I going Wrong
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