(c) The fire detection zone must not include spaces on more than one deck, except—

1. (1) Adjacent and communicating spaces on different decks at the ends of the vessel having a combined ceiling area of not more than 3,000 sq ft;
2. (2) Isolated rooms or lockers in such spaces as mast houses or wheelhouse tops, which are easily communicable with the area of the fire detection circuit to which they are connected; and
3. (3) Systems with addressable detectors and manual alarm stations that can have their status individually determined.