TT With Amd 3 boards

[soulman]

Hi, when installing a consumer unit in domestic premises, I have been swopping out the main switch for an S type 100ma rcd. The reason I have been doing this is advice given in the on-site guide. PG 34 & 35. Dual RCD boards : Stating that there is insufficient fault protection of the single insulated conductors from the bottom of the main switch to the top of the rcd's.
I have come across a few installs recently (TT) that don't have a rcd main switch, I queried this with the Technical Helpline & they state I don't need one.
Does anyone else install a RCD main switch.

Cheers

 

[Midwest]

I suppose the basic question is "is a switched fuse" considered the same as a fuse board?

Tin hat on.

Thought they said they would provide further clarification in the 18th. Think again. I might add a comment to the draft, big myself up.