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
Rank: Apprentice
Progress to next rank:
31.6%
Posts: 11
Joined: Fri Mar 28, 2008 7:04 pm

Sponsor

Simply Build It

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
Rank: Apprentice
Progress to next rank:
31.6%
Posts: 11
Joined: Fri Mar 28, 2008 7:04 pm

Display posts from previous
Sort by
Order by



  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!



 


  • Related Topics