For which type of systems is the NEC concerned with the grounded electrical requirements?

The National Electrical Code (NEC) is comprehensive and establishes requirements for electrical installations to ensure safety and reliability. It is concerned with grounded electrical requirements for all systems, regardless of voltage. This inclusive approach helps to mitigate risks associated with electrical faults, such as shock hazards or electrical fires, by ensuring proper grounding practices are employed across various environments, including residential, commercial, and industrial settings.

Grounding is essential for systems operating under or above 1,000 volts, so the NEC provides standards that cater to both low-voltage and high-voltage scenarios. Recognizing the critical role of grounding in protecting both people and property, the Code does not limit its focus to specific types of systems or voltage ranges, making the correct response comprehensive in nature.