Lightmates

[Rauer]

Can you not just do your r1+r2 and then calculate the zs, have been told that assessors are happy with a calculated zs

 

[telectrix]

yes you can, but not the other way round.

 

[i=p/u]

and then we come onto one of the leading manufactures of test equipment who work out your R1 +R2 for you on their new test equipment..... zf isit?

 

[Rauer]

Yeah been told about that was told by someone that my megger does it but I have never seen it!!

 

[rich.250]

Yes my 1730 does this, never dream of using it as a R1+R2 reading though! They even say in the Megger guide its just for reference as is not a true R1+R2 as there are parallel paths..... So whats the point in the feature?? Lol

 

[Deleted member 26818]

With a PIR, there is no requirement to measure or record R1+R2 on a Radial circuit.
Measuring Zs at each point, and operating any switches will prove also continuity of conductors and polarity.

 

[rich.250]

True, good point. Just proving safe for continued service.
Buts what's wrong with doing the calc? If the tester does it all it may mean that the cowboys win again....

 

[Deleted member 26818]

Nothing wrong with measuring R1+R2, other than it's an unneccessary procedure.
No way will you be able to perform 20min PIRs, if you go around measuring R1+R2 all the time.