What does NEC® Section 110.9 require for electrical equipment?

NEC® Section 110.9 specifically requires that electrical equipment is rated to interrupt fault current. This is an essential safety requirement to ensure that in the event of a fault, such as a short circuit, the equipment can safely interrupt the current flow. If equipment does not have the appropriate rating to handle fault currents, it could lead to catastrophic failures, fires, or electric shock incidents.

The rating to interrupt fault current signifies that the device has been tested and approved to operate safely under fault conditions, which is critical for both the protection of the system and the safety of individuals working with or around the electrical equipment. Therefore, compliance with this requirement is essential in the design and installation of electrical systems to ensure reliability and safety for users.