According to the NEC, grounding electrodes must be at least what size in trade size?

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The requirement for grounding electrodes in terms of size is crucial for ensuring effective grounding and bonding in electrical installations according to the National Electrical Code (NEC). The NEC specifies the minimum size of grounding electrodes, particularly in trade size, to ensure that they can handle the expected fault currents without excessive heating or degradation over time.

When considering grounding electrodes, a trade size of ¾ inch is established as the minimum. This size is appropriate for providing a sufficient surface area to make reliable electrical contact with the earth, which is essential for grounding systems. The characteristics and requirements for grounding electrodes are designed to ensure safety, enhance electrical system performance, and minimize the risks associated with electrical faults.

Using a grounding electrode smaller than ¾ inch could compromise the grounding system's effectiveness, potentially leading to safety hazards such as electrical shock or fire. The choice of ¾ inch is based on industry standards that have proven effective over time for grounding applications.

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