The code you are looking for is not in the NEC. You need to research the local ordinances that regulate buildings in the job location.
In my area, the city, fire department and state all have rules that have the
force of law when it comes to regulating what must be done in a dwelling when the service is changed out.
To be clear, there are many jurisdictions where nothing is required by local code.
Again, where I am, the language of the
[b][i]Minimum Maintanence Electrical Ordinance[/i][/b] only fills one page. In my opinion, it is, at its base, a safety document.
S-type tamperproof fuses, correctly sized for the wire guage, address the hazards introduced by overheating conductors and connections, however, its a fair bet that the history of heating at your job, along the conductors where the current of individual loads sums to its highest total, has toasted insulation, perhaps disasterously.
