Hi , I've been testing some old ( prob 40 yrs plus) Heidelberg platen printing presses and on 3 of them I'm getting an IR reading of 0.10Mohms. These machines do have some electrical add ons that weren't on the standard machines. They're all 3 phase and earth and I'm testing them with a lead...
I hope this in the correct section. New user.
I need to do an I R test on a circuit which I can disconnect the L & N from the rest of the installation ok, but the CPC of this circuit is still
connected to the CPCs of the other circuits of the installation which can't be turned off.
Is...
