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Electrical Inspection & Testing Forum
Unexpected Reading Between Earth And Neutral
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<blockquote data-quote="kerching" data-source="post: 382750" data-attributes="member: 11861"><p>calculate the fault current to see why</p><p></p><p>you have the resistance....ok it is an impedance but I for one do not really care</p><p></p><p>you have the voltage</p><p></p><p>you have the frequency</p><p></p><p>you have Zs</p><p></p><p>you have Ze</p><p></p><p>You have Ip</p><p></p><p>you have the tripping current</p><p></p><p>some of the above put into the correct formula will give you an answer</p><p></p><p>then see if this is &lt;= tripping current=&gt;</p><p></p><p>remember also that some RCDs weaken over time so a ramp test may possibly be required to prove integrity</p></blockquote><p></p>
[QUOTE="kerching, post: 382750, member: 11861"] calculate the fault current to see why you have the resistance....ok it is an impedance but I for one do not really care you have the voltage you have the frequency you have Zs you have Ze You have Ip you have the tripping current some of the above put into the correct formula will give you an answer then see if this is <= tripping current=> remember also that some RCDs weaken over time so a ramp test may possibly be required to prove integrity [/QUOTE]
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