What type of systems does Article 685 encompass?

Article 685 of the National Electrical Code (NEC) specifically encompasses Integrated Electrical Systems. This category includes various technologies and components that are interconnected to function as a unified system. For instance, it covers aspects of how different electrical equipment works together to provide efficient service in a building or facility.

The focus on integrated systems is critical because it addresses the interrelationship between various electrical components, ensuring that they function correctly and safely as part of a larger system. This integration is vital for compliance with safety standards, efficient energy use, and overall operational reliability in modern electrical installations.

While the other options represent important areas in electrical installations—such as fuel cell systems, solar photovoltaic systems, and fire pumps—they fall under different sections of the NEC and do not fall within the specific scope of Article 685. Each of these areas has its own dedicated articles addressing their unique requirements and standards.