![]() ![]() Ground faults are the most common type of fault in an electrical system, and most electrical codes such as the National Electric Code (NECĀ®) require ground fault protection for industrial systems. By quickly detecting the ground fault and initiating the appropriate response, ground fault relays improve electrical safety for workers and minimize damage to equipment due to electrical faults without affecting the uptime of critical operations. Ground fault protection relays, Ground fault protection relays are designed to detect phase to ground fault on a electrical system and trip when the electrical current exceeds the trip time setting. In fact, studies have indicated that ground faults make up more than 95% of the recorded electrical faults, such as arc flash incidents. Since water is conductive, it exposes degradation of insulation and increases the potential for electrical hazards to develop. It is important to note that damp, wet, and dusty environments require extra diligence in design and maintenance. Ground faults are frequently the result of insulation breakdown, but can also be caused by other forms of cable damage or human error. The return path of the fault current is through the grounding system and any personnel or equipment that becomes part of that system. Ground faults are caused by unintentional contact between an energized phase conductor and ground or equipment frame. Ground faults, also referred to as earth faults, represent the vast majority of electrical faults experienced in most industrial facilities.
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