Which article addresses Transformers and Transformer Vaults in the NEC?

Transformers and Transformer Vaults are specifically addressed in Article 450 of the National Electrical Code (NEC). This article provides comprehensive guidelines regarding the installation, operation, and maintenance of transformers, including requirements for their location, protection, and associated vaults. It ensures that transformers are installed safely and efficiently while providing essential information on how to handle various transformer configurations and electrical capacities.

Understanding Article 450 is critical for electrical contractors and electricians, as it covers essential safety standards that must be followed when working with transformers, including clearances, ventilation, and grounding requirements. This knowledge is pivotal in preventing electrical hazards and ensuring compliance with the code.

The other articles mentioned focus on different aspects of electrical installations. For instance, Article 525 relates to carnival, circus, and amusement park electrification, Article 690 deals with solar photovoltaic systems, and Article 700 pertains to emergency systems. Each of these articles has its specific focus and does not cover the requirements for transformers, making Article 450 the correct choice for this question.