According to NFPA 70-2017, are capacitor cases required to be connected to the equipment grounding conductor in most installations?

In accordance with NFPA 70-2017, capacitor cases are generally not mandated to be connected to the equipment grounding conductor in most installations. The National Electrical Code (NEC) recognizes that capacitors inherently do not present the same risks when it comes to electrical shock as other equipment might do. Grounding requirements can vary based on installation specifics and manufacturer recommendations, but the general stance per the code does not necessitate that capacitor cases be grounded.

This opens the topic to other considerations such as specific applications, environmental factors, or local amendments to the NEC that could influence grounding practices. However, for most standard installations, provided that the equipment is properly manufactured and installed, grounding of capacitor cases is not a universal requirement laid out by the NFPA, reinforcing the rationale behind the answer provided.