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"easier carry on talking their language, so they understand what you are on about,"

Agreed.

But whenever I reply here to a layman's question I will try to educate by saying eg "fuse box (Consumer Unit or CU)" and use CU in the rest of the reply.
 
So, I was thinking again today (dangerous,I know😂)

If your 2.5/1 didn’t meet the max Zs value, could you then get past this by fitting an RCBO and using it as fault protection as well as additional?
 
So, I was thinking again today (dangerous,I know😂)

If your 2.5/1 didn’t meet the max Zs value, could you then get past this by fitting an RCBO and using it as fault protection as well as additional?

the issue with 2.5/1 is fault current with a 3036 fuse, not Zs, although high Zs is also a problem but a different one
 
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