Which article outlines the requirements for existing dwelling-type occupancies not exceeding four stories?

The correct choice is based on the specific focus of Article 570, which outlines the requirements for existing dwelling-type occupancies not exceeding four stories. This article provides guidelines tailored to the unique needs of residential buildings of this height. Among these requirements are standards relating to wiring methods, service equipment, and protection against electrical hazards, ensuring that the specific characteristics of dwelling-type structures are adequately addressed.

The other options correspond to different contexts within the National Electrical Code or other regulations. Article 590, for instance, deals primarily with temporary power setups and conditions required for their installation. Article 555 is related to marinas and boatyards, emphasizing safety at those facilities, while Article 547 focuses on farm-related structures and unique considerations for agricultural settings. Each article targets a distinct area of electrical installation or safety, making them irrelevant to the requirements for dwelling-type occupancies specifically. In summary, Article 570 is tailored to the residential context, providing essential information for safely managing electrical systems in such buildings, particularly those that do not exceed four stories.