They want to install a smart meter... but won't fit an isolator... which my old meter has built-in...

[timhoward]

But then technically does even the meter switch in the line comply with the standards for an isolator?

I'm sharing hearsay, but I've been told that in some cases they are a normally-closed single pole relay.
I wouldn't trust my life to one without knowing a lot more about it.

 

[Soi disant]

I think that with due caution it's safe enough to rely on it to install a proper isolator.

 

[Rockingit]

[disclaimer]This may not be true for all meters, but it is certainly true for some[/disclaimer]:

The inbuilt switch only isolates line, N is left connected.

No different to isolation on ANY SP circuit......

 

[Soi disant]

No, no different.