Re: Compliance with NEC 210.52(E)?
If you are not working on this unit, you are not required to bring it up to current codes. If you are doing work, and the amount of work constitutes that the building department wants to bring it up to code, than we need to know if there are more than 2 apartments in this building. If there are 3 or more apartments, you do not have to comply with 210.52(E).
Pierre