Which conditions shall be annunciated by visible means when required by other laws, codes, or standards?

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Understanding when a fire alarm system must show a visible indication helps ensure building personnel can see critical status at a glance. The reason power failure is the best answer is that losing power directly affects the system’s ability to operate, so codes require a visible alert at the panel or remote annunciators to clearly indicate this non-operational status. This ensures maintenance and responders know the system may not function normally and action is needed to restore power. While alarm and trouble/supervisory conditions are indeed indicated, the explicit external-code requirement for a visible indication is most clearly tied to a loss of power, making power failure the correct focus.