What type of heating equipment is covered in Article 425?

Article 425 of the National Electrical Code (NEC) specifically addresses the installation and requirements for fixed resistance and electrode industrial process heating equipment. This includes equipment that utilizes electric current to generate heat through resistive elements or through electrode methods for processes like melting, curing, or heating materials in an industrial setting.

By specifying fixed resistance and electrode heating, the article emphasizes the need for guidelines around installation, safe operation, and maintenance considerations unique to this type of equipment. It provides crucial details on the wiring methods, overcurrent protection, and grounding necessary to ensure safety and efficacy in these industrial applications.

This focus on industrial process heating distinguishes it from other types of heating equipment, like fixed outdoor electric deicing and snow-melting equipment, which falls under a different article that addresses outdoor applications specifically. Similarly, industrial control panels, switchboards, and panelboards are governed by separate provisions that relate more to distribution of electrical power rather than specific heating applications.