Which article contains guidelines for phase converters?

The guidelines for phase converters are found in Article 455 of the National Electrical Code (NEC). This article specifically addresses the installation and maintenance of phase converters, which are devices used to convert single-phase electrical power to three-phase power, allowing for more efficient operation of certain types of electrical equipment and machinery that require three-phase power.

Article 455 includes critical information on the requirements for the safe and effective use of phase converters, including their construction, installation practices, and the requisite markings and listings to ensure compliance with national safety standards. Understanding and applying these guidelines is essential for electricians and engineers when dealing with applications that utilize phase converters, ensuring they function properly and safely within the electrical system.

The other articles mentioned do not pertain specifically to phase converters. For instance, Article 450 relates to transformers and reactive apparatus, Article 470 addresses the requirements for various types of motors, and Article 480 involves storage batteries. Each article focuses on different aspects of electrical installations, which is why Article 455 is the correct reference for phase converters.