CCE - Certified Clinical Engineer Medical Device Electrical Safety and Testing Questions and Answers Flashcards
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Read the first 6 CCE - Certified Clinical Engineer Medical Device Electrical Safety and Testing Questions and Answers flashcards as text
According to NFPA 99, what is the maximum allowable chassis leakage current for a patient-care–related electrical appliance in a general care area?
Answer: 300 microamperes
NFPA 99 specifies a maximum chassis (enclosure) leakage current of 300 µA for electrical appliances used in general patient care areas.
What type of leakage current flows through the patient when one patient-applied part is connected to a device and another patient-applied part is connected to a 120 V AC source?
Answer: Patient auxiliary current
Patient auxiliary current is the current that can flow between patient-applied parts when an external voltage is applied, representing a direct patient safety concern.
Which standard is the primary US reference for safety requirements of medical electrical equipment?
Answer: ANSI/AAMI ES60601-1
ANSI/AAMI ES60601-1 is the US adoption of IEC 60601-1 and serves as the primary standard governing general safety requirements for medical electrical equipment.
An isolated power system (IPS) used in operating rooms primarily protects against:
Answer: Electrical shock from a single fault to ground while maintaining power continuity
An IPS isolates the operating room electrical system from ground so a single ground fault does not cause shock or loss of power, protecting both patients and staff.
What is the function of the line isolation monitor (LIM) in an isolated power system?
Answer: To continuously measure the impedance from each isolated conductor to ground and alarm when it falls below a safe threshold
The LIM monitors the isolation impedance of both conductors to ground and sounds an alarm when a first ground fault reduces impedance below the acceptable level (typically 5 mA hazard current).
When performing an electrical safety inspection, what does the 'ground wire resistance' test verify?
Answer: That the protective earth conductor has sufficiently low resistance to safely carry fault current
Ground wire resistance testing ensures the equipment grounding conductor has low enough resistance (typically ≤0.1 Ω per NFPA 99) to provide an effective fault-current return path.