Which aspect is not specified by NEC® Section 250.62 for the grounding electrode conductor?

The National Electrical Code (NEC) Section 250.62 specifies the requirements for the grounding electrode conductor, which includes the conductor size, type, and material. Each of these aspects is critical for ensuring a safe and effective grounding system.

Conductor size must conform to specific standards to handle the fault current without overheating. The conductor type indicates the suitable forms of conductors allowed for grounding, such as copper or aluminum, which must also meet certain criteria for electrical conductivity and reliability. The material used is significant because different materials exhibit varying levels of conductivity and corrosion resistance, affecting the overall performance of the grounding system.

Corrosion protection, however, is not explicitly specified within Section 250.62. While it is considered good practice to ensure that grounding conductors are protected from corrosion in certain environments, the NEC does not mandate a specific requirement for corrosion protection on grounding electrode conductors in this section. Thus, this aspect is not included in the specifications laid out by NEC, making it the correct focus of the question.