A few questions here to unpack.
If the cause of the blown fuse is an overload, and it’s persistent, it would be the responsibility of the lot owner to pay for the upgrade. Particularly in older buildings, there were fewer appliances in the home, so the wiring was designed to carry less power. ( this applies whether the fuse box in the lot or on common property). An electrician can do a maximum demand calculation very quickly and tell you whether the wiring is overloaded.
You talk of fuses. This suggests an older building that is not using circuit breakers. It would be beneficial for all the fuse boxes to be upgraded. Since you indicate the fuse boxes are on common property, it would be an OC expense. The benefit is that an owner can reset a circuit breaker without the need for an electrician.
To move some of the fuse box into lot space would require an exclusive use by law. That requires the consent of any affected owner. Some may not agree to this transfer of custody.
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