What does NEC stand for in relation to raceways and fittings?

The correct choice is "National Electrical Code." The NEC is a crucial set of standards used in the installation, inspection, and maintenance of electrical systems in the United States. It outlines the requirements for various aspects of electrical work, including wiring methods, raceways, fittings, and safety provisions.

Understanding the NEC is vital for ensuring that electrical installations are safe, effective, and compliant with established regulations. This code serves as a guideline for electricians, engineers, and inspectors, promoting best practices and minimizing hazards associated with electrical systems. The NEC is updated regularly to incorporate new technologies and safety measures, reflecting the evolving nature of electrical engineering and safety practices.