Zs

[snowplough]

Sorry push should read what i write,

I started off saying that i would never have thought you can obtain parrallel path readings by using the test method two with croc clip on earth bar on a R1+R2 dead test, which would give you a lower reading .
Then i was thinking well it might be an incorrect R1+R2 measured reading by not disconnecting the cpc from earth at test, but does it really matter when overall, it can only contribute to a lower Zs reading, which means disconnection times can be met, lowering the electric shock risk.

Many Thanks

lOCKET

 

[pushrod]

Got you now.

R1+R2 readings are fundamental when designing and installing. Checking them allows you to compare to design/check quality of installation. If you are doing an R1+R2 you would want it to be accurate.

When you have an existing installation ie you are doing a minor works or a like for like replacement/repair that is where the emphasis moves more to your Zs reading.

 

[snowplough]

Thanks pushrod for your input,

Ive loads more questions ,but ill save them for another day

akaind Regards

Locket