earth loop reading


Postby ian2799 » Tue Jul 01, 2008 6:13 pm

can anybody tell me why the earth loop impedance on a circuit should be a lot lower than r1 plus r2 reading i thought earth loop reading should equal r1 plus r2 plus ze
ian2799
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Postby ericmark » Wed Jul 02, 2008 4:02 am

You are correct Ze + R1 + R2 = Zs but R2 may have parallel paths which will reduce it's reading.
In real terms R1 + Rn is the more limiting factor as with RCD's on nearly everything the 5% volt drop will normally be what controls cable length.
All best Eric
ericmark


Postby ian2799 » Wed Jul 02, 2008 5:13 pm

many thanks ericmark this makes perfect sense
ian2799
Posts: 11
Joined: Fri Mar 28, 2008 7:04 pm


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