Zdb before dead tests.

[swaley]

Hi guys got my assesment in 3 weeks and want to get my testing spot on. Little confused whether to test Zdb on 2 way CU before dead tests?? Or do I jump straight into continuity? Thanks in advance.

 

[westward10]

How does that work say for a garden shed that you intend to TT?

Any ideas too many Zds now.

 

[ipf]

deleted

 

[7029 dave]

I agree but not a abbreviation I ever quote. I believe it has been adopted where a true value of Ze cannot be established due to operational restrictions and the value is often referred to as Zdb which although often quoted is not a recognised abbreviation.

Yes, with main earth conductor in situ , plus all parallel paths connected.

 

[7029 dave]

I agree but not a abbreviation I ever quote. I believe it has been adopted where a true value of Ze cannot be established due to operational restrictions and the value is often referred to as Zdb which although often quoted is not a recognised abbreviation.

Yes, with main earth conductor in situ , plus all parallel paths connected.

 

[Midwest]

Coronation Street not on tonight

 

[KEV 1 N]

Only Z’s I’m thinking of! (Yawn)

 

[Wilko]

Zztop -

 

[Risteard]

How does that work say for a garden shed that you intend to TT?

You will have a Zs for that distribution circuit, and the Zs for the final circuits fed from it will have no correlation with that (ignoring the fact that the phase (or line as it is called now) is common).

 

[Deleted member 26818]

You will have a Zs for that distribution circuit, and the Zs for the final circuits fed from it will have no correlation with that (ignoring the fact that the phase (or line as it is called now) is common).

What will be the Ze/Zs at the board?

 

[Risteard]

What will be the Ze/Zs at the board?

The Zs at the DB will obviously be via the spike. I really get the feeling you're overcomplicating this. I see no merit in a made-up term "Zdb" - Zs covers everything perfectly.

 

[ipf]

It's just a shortened version of Zs@db . Let's get on with it.

 

[swaley]

That wasn't clear from the op.

So I would install and test the sub main first, including live tests...

Then move on to the dead and live live tests in the new building.

You need the ze + R1 +R2 of the sub main top check the Zs of the sub main (which is also the zbd)

Then you have the zbd +R1 +R2 and then the Zs ....

So one EIC, 2 schedules ....

Where is the RCD?

Cheers Murdoch. Rcd is in main CU.

 

[Octopus]

Cheers Murdoch. Rcd is in main CU.

What cable has been used for the sub main?

 

[swaley]

What cable has been used for the sub main?

6mm SWA

 

[DPG]

Does it need rcd protection at source?