Carrying out a few consumer unit replacements at a hotel, installation to the room is via trunking conduit with no cpc however at the rooms previous refurbishments have been carried out these being wired in Twin and earth with the cpc being connected to the existing system. Now I am not sure what to record as the R1+R2 results do I add a limitation or calculate from the Zs Ze readings and state that's what I have done?