Got a call today to have a look at a faulty shower circuit, they had had an "electrician " in yesterday. To rectify a problem at the shower pull cord isolator switch. I am not sure what that problem was but I guess the pull cord was jamming and also a loose connection at the terminals as the occupants of the house claimed the pull cord would not operate and they could smell burning.
Anyway the "electrician's " remedial work was not quite up to the requirements!
As you can see above
The shower was rated at 9.5kW output on 6.0mm T&E 40A MCB on the non RCD protected side of a split board.
I can't believe they did not put a notice up at the CU regarding the two versions of BS7671 wiring colours!