Who is affected by NEC Article 409?

Personnel who are typically impacted by NEC (NFPA 70) sections 409 and 670 include:

• End Users
• OEMs
• Systems Integrators
• Panel Builders
• Contractors who build or maintain industrial control panels

According to UL an assembly incorporating two or more pieces of industrial control equipment or related control circuit devices, provided with interconnecting wiring and terminals for connections in the field.

Examples:

• Power circuit components
• branch circuit protective devices
• branch circuit fuse holders
• disconnect switches
• load controllers
• motor overload relays
• terminal block
• bus bars

The NEC Article 409 standard is complementary to the Arc flash standard for electrical safety. However this standard is aimed at the point of assembly rather than afterward within the buyer's workplace.