Who pays for repairs to the electricity fuse box in a unit?

Hi I am chairman of a self managed group of 15 villas on the south coast. Each of the villas has it's own fuse box (but not meter box) in the laundry of each villa. These fuse boxes are fixed to the wall (ie they are not recessed into the wall). 

There are two large meter panels outside (on common property) where the actual meters for each unit are stored.

Who is responsible for repairs (and maintenace too I guess) of the fuse boxes in the individual villas. Does the owner pay for repairs (if a fuse blows or the board needs replacing (which is how this question arose)?

Thankyou Phil