Because the equivalent area is above 1,100 kcmil for copper, the grounded conductor (s) shall have an area not less than 12. This is an area of roughly 312. 5 kcmil, which according to Table 8 of Chapter 9 in the 2017 NEC, is 350 kcmil copper. The GEC should be sized. Section 250. This section also adds requirements, conditions, and restrictions to such installations. Rod, pipe, and plate grounding. The National Electrical Code (NEC) provides comprehensive safety standards for electrical installations, including requirements for electrical panels (main service panels and subpanels or breaker box). Electrical grounding and bonding is one of the many misunderstood topics of. The grounding electrode conductor connection to the neutral conductor at service equipment must be made at any accessible point from the load end of the overhead service conductors, service drop, underground service conductors, or service lateral to the terminal or bus to which the service neutral. Article 250 of the NEC covers the grounding and bonding of electrical systems. However, they do work closely together in a yin-and-yang relationship to help ensure safety in electrical systems.