Which article focuses on Transformers and Transformer Vaults?

The focus on Transformers and Transformer Vaults is primarily found in Article 450 of the National Electrical Code (NEC). This article provides specific guidelines and requirements regarding the installation, maintenance, and operation of transformers, including their grounding, overcurrent protection, and locations, especially when they are housed in vaults.

Article 450 outlines considerations such as spacing, installation methods, and ventilation necessary for safe and effective operation of transformers, which is crucial in various applications where transformers are used to step down or step up voltage for distribution systems. Proper understanding of these requirements ensures safety and efficiency in electrical installations involving transformers.

Other articles, while relevant to specific electrical topics, do not specifically address the detailed standards for transformers and their vaults. Article 517 deals with healthcare facilities, Article 100 contains definitions applicable throughout the NEC, and Article 230 focuses on services and service equipment.