Article 570 provides requirements for which type of building?

Article 570 of the National Electrical Code (NEC) pertains specifically to existing dwelling-type occupancies that do not exceed four stories. This section outlines the requirements for electrical installations in these types of buildings to ensure safety and compliance with applicable codes. It is designed to address the unique characteristics and needs of residential buildings while providing guidelines for electrical work.

The focus on existing structures is significant because it helps manage the complexities that arise when updating or maintaining older electrical systems. The provisions in this article facilitate safe modifications or enhancements to the electrical service in residential settings, ensuring that they adhere to current safety standards.

The other options—mobile homes, recreational vehicles, and marinas—are governed by different sections of the NEC that cater specifically to the unique requirements and safety concerns associated with those types of structures. As such, they do not fall under the jurisdiction of Article 570. This differentiation is essential for ensuring that each type of occupancy is addressed appropriately, promoting safety and clarity in electrical installations.