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That has been the point, the BS7671:2018, BS7671:2008 and BS7671:2001 all states when comes into force. Before that date the previous edition is used.Whilst that is true, it doesn't really matter, does it, since an EICR is undertaken to determine whether an installation complies with regulations which are current at the date of the EICR, regardless of when the installation was designed or installed?
But to do that you need the date of design, without the date it was designed you simply don't know which BS7671 it has to comply with.
I have a copy of BS7671:2001 I don't have a copy of BS7671:1992 which was the first edition of BS7671.
andBS7671:2008 said:BS 7671:2008 Requirements for Electrical Installations was issued on 1st January 2008 and is intended to come into effect on 1st July 2008. Installations designed after 30st June 2008 are to comply with BS 7671:2008.
So it would seem if designed before 1st January 2002 then can comply with BS7671:1992 and will still comply with BS7671:2018 because of the dates which they were designed by.BS7671:2001 said:BS 7671:2001 Requirements for Electrical Installations was issued on 1st June 2001 and will to come into effect on 1st January 2002. Installations designed after 1st January 2002 should comply to this edition.
As said I don't have earlier editions to see if you can go further back, but unless the inspector has some proof as to when designed, he has to assume it was designed after 2018, OK may be with red and black colours that gives a good indication, but how does he know old colours not used?
The exception is where the changes are not set by BS7671, if the HSE have set rules, these may need to be complied with, as with fire prevention and detection, but big question is an electrician qualified to make a judgement on fire prevention and detection? I would say no, and if I needed to do an EICR I think I would state this is an electrical installation report only, if a report is required on fire prevention and detection or any other safety feature of the property, this needs to be done by some one qualified in the field.
As to if potentially dangerous can be assigned to anything installed in 2018 which can't be assigned to something designed in 1992 will depend on other changes like earth methods. But they would get C3.