TheScullster wrote:
Hi all

I have a Clisal box with Hager MCBs.
The box is split with power circuits on a single RCD.
To meet 17th edition and satisfy BCO, it looks like I will need RCBOs on
kitchen circuits (lighting and cooker).
Does anyone know whether there are restrictions on what boxes can take the
RCBOs as a retro fit?

They will generally all be able to take the double width RCBOs. Only the
taller ones will take the single module ones.

That does suppose that you can still get any spares that fit. A good
number are interchangeable, although technically speaking mixing brands
would void the type approval.

--
Cheers,

John.

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