What is the minimum length requirement for grounding electrodes made of non-metallic materials?

The correct answer indicates that a minimum length of 10 feet is required for grounding electrodes made of non-metallic materials. This standard is established to ensure that the grounding system is effective in providing safety and reducing the risk of electrical shock or fire hazards.

Non-metallic grounding electrodes are often used in certain installations to ensure that the grounding system is resistant to corrosion and other environmental factors. The requirement for a minimum length serves multiple purposes: it increases the surface area in contact with the ground, improving conductivity and stability, and helps ensure that the grounding system remains effective under various soil conditions.

In the context of grounding and bonding, it is critical to comply with safety standards, as having inadequate grounding can lead to insufficient protection in the event of a fault or surge. Therefore, the specification for 10 feet is a reflection of industry practices aimed at ensuring both safety and the functionality of electrical systems.