andy_spark
Senior Member
As regards to 32a mcb, have a look at the current time curves in the BGB. I remember this coming up before on here, I a 32a mcb will draw 50 amps for 800 - 1000 seconds or about 13 - 16 minutes. An 8.5 kw shower is not going to draw more than 41 amps a 250 volts, according to Fig 3a4 it will not trip before 10 000 seconds or 166 minutes or 2.75 hours or a very, very, very long hot shower.