My reply was to FWL_Engineer, I wondered how he will deal with an extreme situation without using the diversity factorI personally always assume that at some point the appliance will work at full load, normally christmas time in the case of cooking appliances, so always wire accordingly. I look at it if you take the worst case scenario, your covered, HOWEVER, I install for others so do not have the luxury of knowing how the equipment will be used in practise.