What is the primary focus of Article 551 in the National Electrical Code?

Article 551 of the National Electrical Code specifically addresses the electrical requirements for Recreational Vehicles (RVs) and Recreational Vehicle Parks. This article is essential because it provides guidelines for the safe installation and use of electrical systems in RVs and the infrastructure within RV parks, ensuring that both the vehicles and the facilities comply with safety standards.

The provisions in this article cover various aspects, such as the types of wiring permitted, the proper grounding methods, and the requirements for receptacles and services. These guidelines help protect the users of RVs and those who operate RV parks from electrical hazards while promoting safe connections to the electrical supply.

While other options like park trailers, floating buildings, and electric signs and outline lighting are important topics in the NEC, they are covered in different articles. For example, park trailers have their specific requirements under a different article, and floating buildings have separate considerations due to their unique conditions and challenges related to water. Electric signs are handled under a separate section that focuses specifically on signage and lighting. This focused approach helps avoid confusion and ensures that each category of electrical installations is appropriately regulated.