According to Article 110.17, how should electrical equipment be marked?

The requirement stated in Article 110.17 emphasizes that electrical equipment must be marked with proper ratings and identification. This marking is crucial for safety and functionality, as it provides essential information about the equipment's suitability for specific applications, including voltage ratings, current ratings, and environmental conditions in which the equipment can safely operate.

Proper markings help ensure that users can easily identify the specifications and ratings necessary to operate the equipment safely and effectively, which aids in preventing accidents or misuse. Such markings contribute to the overall understanding of the equipment's capabilities and limitations, reinforcing the importance of adhering to safety standards.

The other options do not encompass the critical requirements set out by Article 110.17 regarding marking. For instance, while color-coded wiring can be beneficial for identification, it is not a requirement for marking electrical equipment. Similarly, displaying a manufacturer's logo or including a maintenance schedule might be useful, but they do not provide the essential operational specifications mandated by the NEC.