Er, I think I was rubbish at explaining what I meant - 3.6.1 requires isolators, 3.6.2 makes certain exceptions, allowing direct connection to the battery, where a suitable fuse or circuit breaker must be fitted. D'oh!
3.5.3 requires that battery charging devices connected directly to the battery are fuse / circuit breaker protected. Excludes engine driven alternators.
Fortunately, my wiring up appears to be better than my writing as I've just had an installation inspected against this standard without any changes required - except that one piece of equipment was marked as non operational by the examiner. I wasn't there at the time, but when the purchaser queried this with me, I pointed out & then engaged the large, clearly marked circuit breaker on the obvious switchboard and, bingo, the equipment is now operational (this piece of equipment was defined by the manufacturer as requiring direct battery connection
I was also just wondering whether going "above & beyond" would be ok. I was thinking of a situation where family, hirers or friends borrowing the boat were rubbish at ever turning off the isolators - would fitting a suitably sized fuse to a supply even though going through an isolator, provide extra protection & be BSS acceptable - I can't see why not? I know some yachties do this.