Discuss Zdb before dead tests. in the Electrical Forum area at ElectriciansForums.net

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As westward points out it is the Zs of the distribution circuit. There is no BS7671-defined term "Zdb" so I would agree that it shouldn't be used.
 
I think common sense is called for here. ............. its distinctly lacking in BS 7671

If you refer to a Zs - its the end of a circuit
If you refer to a Zbd - its obvious its at a sub board

So maybe it should be called a ZeZdb

:)
 
I think common sense is called for here. ............. its distinctly lacking in BS 7671

If you refer to a Zs - its the end of a circuit
If you refer to a Zbd - its obvious its at a sub board

So maybe it should be called a ZeZdb

:)
Or Impedance at the DB Or more sensibly Zdb, what on earth is the argument for, after all it may not be a regulation but Z db makes sense to me
 
I think common sense is called for here. ............. its distinctly lacking in BS 7671

If you refer to a Zs - its the end of a circuit
If you refer to a Zbd - its obvious its at a sub board

So maybe it should be called a ZeZdb

:)
No Zs.
 
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.
 
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.
 
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).
 

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