If susceptibility data for the EID is known to be less than the values used to establish the worst-case protective requirements, the EID shall be classified as _____.

• A. HERO safe
• B. Safe separation
• C. Eid
• D. HERO unsafe

Answer: (D)

HERO safety classifications are based on worst-case susceptibility values used to set protective requirements. If testing shows the EID is more sensitive (its susceptibility is lower) than those worst-case values, it can be initiated by a smaller amount of electromagnetic energy than what the protective measures assume. In that case, the device cannot be considered HERO safe, and it is classified as HERO unsafe. This designation signals that the current protections aren’t sufficient and stricter controls—such as greater separation, shielding, or removal from HERO-controlled environments—are required.