Fusee' & User guide Fuse Box Consumer Unit (F2 Series) 1 Technical Information la Fuse Box metal consumer unit must be installed by a qualified electrician in accordance with the current IET Wiring Regulations BS7671. 1b Total load must not exceed the rating of the incoming isolation or any additional limitation. 1c The total sum of the individual Mobs/ Bosch may exceed this value where there Is appropriate diversity In the Installation.