Hmmmm not sure that's right?...

[Guest111]

I seem to recall . I had an old seaward e/loop tester years ago within a black leather case that had a fixed mains lead with plug top fitted and a earth prod socket for wandering earth lead , that was what we used for testing bonding continuity on sinks and earth terminals at light fittings , if not careful you would leave a burn mark on sinks , as it gave out 20 amp pulse , no way could you use the live on the lighting circuit as it would defo disconnect the fuse ..

I will hunt around I might still have it..

we used to call it a splash test,I've still got mine in the cupboard.

 

[Rockingit]

OK, it's not correct and I'm therefore not going to defend it, but just thinking it through logically, the reading he'll be getting is R1 of a power circuit, and then the R2 of the lighting one + % of the R2 of the power. So, at least his Zs will be pessimistic.