How do you test for ze & zs on an electrical system?
Question:i have an exam in a few weeks & dont understand what points on an electrical system to test for the above
if any good egg sparkeys or lecturers can put in laymans term please help
regards
Answers:
Have a look here - click on the link 'loop impedance' and follow it through. It has some diagrams that explain it better than I could.
http://www.rsc-northwest.ac.uk/curriculu...
I'm a pretty damn smart electrical contractor and I have no idea what ze and zs means, I'd like to know what the heck you're trying to figure out
well you must of not gone to college if you dont know what he is on about.
To test the Ze you need to do a earth loop test on the main live neutral and earth coming into the house.
To test the Zs you need to do a earth loop test on the circuit you are testing like sockets etc,
Zs = Ze+r1+r2
Ze is the external Earth fault loop impedance. Measured at the source of the supply. Zs is the Earth fault loop impedance, normally measured at a point (socket) furthest from the supply.
Jsparky, how can you say you are a spark and have never heard these terms??!!
Zs = Ze + (R1 + R2) NOTE BRACKETS
Get hold of Guidance note 3. page 55.
Zs would be at a point in a final circuit. Such as a lightswitch.
Ze is taken at the CU, on the load side of the main switch.
Main Equipotential disconnected
All circuits off
Main switch on
Zs= Ze + R1+R2
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