What is the maximum leakage current allowed at the chassis when the ground wire is disabled?

The maximum leakage current allowed at the chassis when the ground wire is disabled is set to ensure safety standards and minimize the risk of electrical shock. A leakage current of up to 100 microamperes (uA) is considered safe for most medical devices and equipment, allowing for adequate protection for patients and operators. This limit is established in various safety standards and guidelines, emphasizing that any leakage current in excess of this threshold could present a safety hazard.

The threshold of 100uA serves as a crucial point, as higher levels of leakage could lead to an increased risk of electric shock, particularly in environments where patients are in close proximity to electrically powered medical devices. Maintaining the leakage current at or below this level provides a margin of safety, ensuring that even if the grounding system is compromised, the potential for harm remains low.

In contrast, values exceeding this threshold would not align with safety regulations meant to protect users and patients, and thus, the established limit of 100uA is the correct choice in this context.