What is the maximum impedance for ground-fault monitoring in an AC system according to ABYC E-30 standards?

The maximum impedance for ground-fault monitoring in an AC system, as specified by ABYC E-30 standards, is indeed 1,000 ohms per volt. This standard ensures that ground-fault protection systems can effectively detect faults in electrical systems. The rationale behind this specific impedance level is rooted in safety; it allows for a sufficient ground-fault current that can trigger necessary protection mechanisms without being so low as to inadvertently cause nuisance tripping from minor voltage fluctuations.

By establishing this impedance level, ABYC aims to balance safety and practical usability in marine electrical systems. It ensures that in the event of a ground fault, the system will respond appropriately by allowing a certain amount of fault current to flow, which is vital for the grounding systems to function correctly. This impedance level contributes to the overall reliability of the electrical system in preventing potential hazards associated with ground faults.