Which standard primarily addresses equipment grounding?

The standard that primarily addresses equipment grounding is NFPA 70, also known as the National Electrical Code (NEC). This is a widely adopted standard that establishes the safe installation of electrical wiring and equipment in the United States. Within the NEC, there are specific sections dedicated to grounding and bonding, which are crucial for ensuring electrical safety and preventing shock hazards.

Grounding is vital because it provides a path for fault currents to flow safely to the ground, helping to reduce the risk of electrical shock, fire, and equipment damage. The NEC outlines requirements for properly grounding electrical systems, including grounding conductors, grounding electrodes, and their installation methods, ensuring that both personnel and property are protected.

In contrast, while other options like NEMA 250 might touch on grounding in the context of enclosures and environmental protection ratings, and IEEE C2 (National Electrical Safety Code) may address grounding aspects in utility settings, they do not solely focus on the comprehensive grounding requirements that NFPA 70 does. NEC 10 is not a standard reference relevant to equipment grounding, as it does not exist in the context provided. Therefore, NFPA 70 is recognized as the primary source of information regarding equipment grounding.