changing a consumer unit

[Spark123]

To be pedantic, it is R1+R2, we don't use lowercase r1+r2 for all circuits as this is usually only used as part of the check for ring final circuits.

 

[roberta1000]

Seems a little extreme until you connect up a ring circuit that has been broken at some time.
You then turn on the kitchen appliances and the single cable overheats and catches fire.

Not so extreme as it happens but only this afternoon I had a small job where I found a recently (ish) installed CU where the kitchen/utility ring was broken. The break was in one of the neutrals in the CU itself where the core had been nicked and the fault was that one of the kitchen sockets was getting hot (because the connections had loosened).

Clue? - The socket only had a TV plugged into it.