I presently have a gas cooker. I want to change to an electric hob and oven. The consumer is rated for 80Amp. There is no spare slot for a 32Amp MCB. However, when I add up the ratings of all the fuses installed in the consumer unit it comes to 70Amp, leaving only 10Amp before the rating of the box is exceeded. As all these circuits will not be loaded at anyone time can the total rating of the all the fuses exceed the rating of the consumer unit?