Which Code article specifies the minimum requirements for service conductors feeding a 400-ampere service?

Article 230 of the National Electrical Code (NEC) specifically addresses service conductors, which includes the requirements for the conductors feeding various sizes of services, including a 400-ampere service. This article outlines important parameters such as conductor size, insulation types, and installation methods to ensure a safe and reliable electrical service.

Understanding this article is crucial for electrical professionals because it provides the foundational guidelines necessary for compliance with safety standards during installation and maintenance of electrical systems. It ensures that the conductors used can handle the current load safely and also addresses the physical aspects of conductor installation, enhancing overall system integrity.

Options discussing conductor insulation types or sizes that may pertain to specific applications (like Article 310) or those addressing overcurrent protection and their characteristics (like Article 240) do not focus directly on the requirements for service conductors feeding a specific amperage service. Article 220 deals with load calculations rather than the conductors themselves. Therefore, Article 230 is the appropriate reference for understanding the minimum requirements for service conductors in this context.