MET and Ze/ Zdb

[studentspark]

When you measure Ze, I understand it has to be at the origin.

In this drawing I have the incoming service , then onto an isolator, then the main Db and 2nd and 3 DBs

Would you take the Ze from the Main DB or from the isolator?
All the other measurements are Zdb and the CPC ? would remain in place

Also you only have one MET, the other earthing points are know as marshalling terminals.
So The connection from the earthing source to the MET is the Earthing conductor,
All subsequent connections are CPCs


Is that correct.
Thanks

ZE -Zdb

• studentspark
• 22 Aug 2020

 

[flameport]

Ze between the earthing conductor and L as close to the origin as possible - in this example at the incoming side of the isolator.
Isolator must be off, and the earthing conductor disconnected from the rest of the installation.

 

[flameport]

 

[studentspark]

Thanks very much for the reply