According to Article 110.2, what should be the condition of electrical installations?

The requirement outlined in Article 110.2 emphasizes that electrical installations need to be free from foreign materials and contaminants. This condition is crucial to ensure the safety and proper functioning of the electrical system. Contaminants or foreign materials can lead to overheating, corrosion, and ultimately equipment failure, which could pose safety risks and increase maintenance costs.

For an installation to function safely and effectively, it must be kept clean and maintained in an environment that protects it from potential hazards. This reflects the core principles of safety and reliability in electrical installations as mandated by the NEC.