Solar isolator (to distribution board)

[SJD]

I don't do PV, so not overly familiar with specific regulations.

Yesterday I was changing a consumer unit, and the isolator for the PV was adjacent to the consumer unit.
Due to needing a bit more space, I had to move this isolator a few cm and noticed it was single pole, switching L only.
A second isolator at the PV end of the cable was the same type.
I was a bit surprised, I'd expected N would have been isolated as well, but it was not.

Is this common practice, or should double pole isolators have been used?

 

[marconi]

https://www.bre.co.uk/filelibrary/pdf/rpts/Guide_to_the_installation_of_PV_systems_2nd_Edition.pdf

See page 26 para 2.3.2 second bullet - ac switch disconnector in Lines and Neutral.

https://www.electricalsafetyfirst.org.uk/media/1202/best-practice-guide-3.pdf

See first para page 15 'Isolation and labelling' - again Lines and Neutral with Reg reference.

Good spot Sir