Advice on TT system

[Skys]

When carrying out Ze with main earth disconnect I get a reading of 77.25 ohms. All good. When main earth is reconnected and all parallel paths in place reading comes down to 0.60 ohms. I have 3 lighting circuits not covered by an rcd all Zs readings are well in permitted Zs. Would any body apply a code to this when carrying out a EICR. Never had this scenario that the Zs falls so low on a TT due to parallel paths . Thanks

 

[Gavin John Hyde]

DNO very often won't give PME in this situation due to multiple supplies within a commonly bonded structure.

Quite fortunate in that the landlord of this unit has had it from day 1. He pulled all his paperwork out and seems different sections /rows had different dnos. One side of this section is SSEN who have PME this part is an IDNO. Each phase was different builder's, dno etc... I have done a lot of work in units there. Fitted a few ev chargers...
Treated all the units as pme despite the rods as safest option. Fitted matt:e on earlier installs and then zappis