A system over 1,000 volts that is solidly grounded at only one point is referred to as what by the NEC?

A system over 1,000 volts that is solidly grounded at only one point is classified as a single-point grounded system according to the National Electrical Code (NEC). This classification is critical for ensuring safety and reliability in electrical installations, particularly in high-voltage situations.

The term "single-point grounded system" indicates that the grounding occurs at only one location, which helps prevent ground loops and can reduce the risk of electrical interference and hazards associated with multiple grounding points. This approach is vital in high-voltage systems to maintain stable reference points and reduce the likelihood of fluctuating ground potential that could pose risks to equipment and personnel.

Understanding the need for a single grounding point is essential for the design and implementation of electrical systems, particularly in large facilities or installations involving substantial power levels. The correct grounding practices help maintain system integrity and safety as outlined by the NEC, which emphasizes the importance of proper grounding methods in high-voltage applications.