What is the classification of service equipment required by the NEC?

The classification of service equipment as required by the National Electrical Code (NEC) indicates that it must be field labeled. This requirement ensures that any service equipment used in a specific installation meets the necessary standards for safety and performance evaluated by a qualified authority. Field labeling is crucial because it confirms that the equipment, while possibly modified or installed under specific conditions, is in compliance with the NEC and has been approved based on its intended use.

Field labeling is particularly important for equipment that may not be listed by a Nationally Recognized Testing Laboratory (NRTL) but still needs to meet code requirements. This allows for flexibility in installations while maintaining safety. The labeling acts as a form of verification, showing that thorough inspections and testing have been conducted to confirm the equipment's suitability for the application.

In comparison, while the weatherproof aspect is relevant for certain installations, it does not apply universally to all service equipment. The requirements for hazardous locations apply specifically to equipment used in those environments, and color-coding, while useful for identification and safety, is not a standard requirement for all service equipment according to NEC guidelines. Thus, the emphasis on field labeling aligns with the NEC's focus on ensuring that service equipment is appropriately assessed for safety in its actual installation context.