Did the owners who replaced their fuse board have permission? If not, they may have to cop it sweet.
However, one way round this may be for the switchboard to be replaced by the Owners Corp which then “buys” the new fuse boxes off the owners.
However, if you can’t get enough votes to get a special resolution through to enable that, then the owners who jumped the gun (and, by the way, acted improperly) could be compelled to pay their share of a new board.