Zs from board supplying another board

[davesparks]

If it's the origin CUU does anything need to go into
"Zs at DB" on the "Schedule of test results" form ?

Yes, the Zs at the DB goes in the "Zs at DB" box, the clue is in the name, it's not a trick question.

 

[ipf]

If it's the origin CUU does anything need to go into
"Zs at DB" on the "Schedule of test results" form ?

Nope, unless it's not connected to origin.

 

[Pete999]

But, 'Zs at DB1, 2, 3', whatever, is a statement...nothing wrong with the terminology, whatsoever.

I agree with ipf, but there will always be a Jobsworth that disagrees with this though.

 

[Mark Wright]

Yes, the Zs at the DB goes in the "Zs at DB" box, the clue is in the name, it's not a trick question.

Nope, unless it's not connected to origin.

Bit of Confusion there, Someone did tell me I have to do the Ze test with all Parallel paths even at origin seems a bit pointless.

 

[Ian1981]

Bit of Confusion there, Someone did tell me I have to do the Ze test with all Parallel paths even at origin seems a bit pointless.

You do your PEFC with all parallel paths connected at the origin not a ZE test .The Ze test determines the resistance of the earthing conductor external to the installation and confirms an earth connection to the installation hence it’s done with no parallel paths connected.

 

[Mark Wright]

If it's the origin CUU does anything need to go into
"Zs at DB" on the "Schedule of test results" form ?

You do your PEFC with all parallel paths connected at the origin not a ZE test .The Ze test determines the resistance of the earthing conductor external to the installation and confirms an earth connection to the installation hence it’s done with no parallel paths connected.

I'm talking about Schedule of test result - Zs at DB

 

[Ian1981]

I'm talking about Schedule of test result - Zs at DB

Bit of Confusion there, Someone did tell me I have to do the Ze test with all Parallel paths even at origin seems a bit pointless
Source URL: Zs from board supplying another board - https://www.electriciansforums.net/threads/zs-from-board-supplying-another-board.186371/#post-1629157
Responding to your quote which stayed that someone had told you to test Ze with parallel paths connected at the origin

 

[Mark Wright]

ill just take it you don't have to do Zs at DB at origin DB, unless anyone says differently.

 

[Strima]

ill just take it you don't have to do Zs at DB at origin DB, unless anyone says differently.

The test carried out at the origin DB is the Ze not Zs. This is done with parallel paths removed to confirm the continuity and loop impedance of the DNO supply.

Zs is done with parallel paths in place on distribution and final circuits to ensure the installation disconnection times can be met.

 

[Mark Wright]

I know that - Top left corner of Schedule of test results - "Zs at DB"