There are many arrangements of service equipment that do not provide overcurrent or fault protection to buss bars. Sectional switch gear with six main switches is a good example. We have all seen multiple disconnects used as service equipment. The tap conductors from the service conductors to each disconnect are also without any OCPD. The Buss bars are insulated from contact with other conductors and grounded surfaces by air. That is why they are rigidly held in place. They are protected fro accidental contact by the enclosure dead fronts instead of insulation that covers the conductors.
--
Tom
