wrote:
On 23 Jan,
John Rumm wrote:

Not sure what you mean about voiding type approval.
What difference does the manufacturer of each individual MCB or RCBO make?
In reality probably none. However a manufacturer will design and test
their CU with their matching MCBs / RCDs etc. If you substitute another
then there is no longer any proof that the whole thing will perform as
expected. Personally it would not worry me since there is not much
difference between modern CUs that is likely to make a difference and
all the components are tested to their own individual standards as well.

(My Contactum CUs have MK type S incommer RCDs (TT system), and a Hager
cartridge fuse carrier for the garage submain feed).

I've found some types where there is incompatibility with the bus bar entry
position. This can be got round if in the end positions by using a cable
jumper instead of busbar. Whatever this does for type approval is another
matter.

Some you may need a slight double bend in the finger on the bus bar to
get it lined up correctly.

--
Cheers,

John.

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