Hi, all.
Happy New Year.

I have a Merlin Gerin board, which I need to make some changes to, and am
looking for advice on a couple of points:

1) The M-G range of single-width single-pole RCBOs ( eg RS 467-9723 ) seem
to all be type C tripping characteristic. Is it acceptable to use type C
devices in a domestic environment where type B would normally be used?

2) Remind me what circuits require RCD protection under 17th edition?

Is it *all* power rings?
Or just ones where there's a liklihood of appliances being used outside?
ISTR that lighting circuits in special locations do now. Does that apply
even if all the lighting in the special location ( bathroom ) is 12v?

--
Thanks,
Ron