[genoaark]

In the past, has National Code ever approved an electrical service to pass directly from the transformer to an electrical breaker box with out protection of a disconnect, fuses or breaker? Or would that have always been a bad idea?

[stanfortyman]

Honestly, I don't get exactly what you are asking.

If there are less than six breaker throws then no main disconnect or breaker is required.

[hkstroud]

KISS put an interesting post about the history of the NEC in this post
https://www.askmehelpdesk.com/electr...ng-398059.html

He gave a link to
History of Residential Wiring Systems

In that link it looks like the New York Board Fire Underwriters in 1881, established a requirement for a disconnect at the building entrance.

[tkrussell]

If you are referring to the utility transformer, no protection is required at the secondary of the transformer serving a service panel. The panel will need a main breaker to protect the service.