CCE CCE - Certified Clinical Engineer Medical Device Electrical Safety and Testing Questions and Answers 2

Question 1

In IEC 60601-1 terminology, a 'Type CF' applied part provides:

Accepted Answer

The highest level of protection, suitable for direct cardiac application with the lowest allowable leakage current limits

Answer

Basic protection for general patient contact only

Answer

Defibrillation-proof isolation for external applications

Answer

Protection against transient overvoltage from utility lines

Question 2

Macroshock refers to electrical current that:

Accepted Answer

Passes through the surface of the body at levels detectable by the patient, potentially causing ventricular fibrillation at currents above about 100 mA

Answer

Bypasses the skin and flows directly through internal cardiac tissue

Answer

Is confined to the surface of the skin without entering the body

Answer

Results from static electricity buildup on medical devices

Question 3

Microshock is particularly dangerous for patients because:

Accepted Answer

Current is applied directly to or near the heart via an intracardiac catheter, so as little as 10 µA can induce ventricular fibrillation

Answer

It occurs silently with no symptoms until cardiac arrest

Answer

It bypasses all protective grounding in the room

Answer

It is undetectable by standard electrical safety testers

Question 4

Which test instrument is specifically designed to measure leakage currents and chassis resistance during biomedical electrical safety testing?

Accepted Answer

An electrical safety analyzer (e.g., Fluke ESA620 or equivalent)

Answer

A digital multimeter set to AC voltage

Answer

An oscilloscope with current probe

Answer

A clamp meter measuring AC amperes

Question 5

What is the maximum patient leakage current allowed under normal conditions for a Type BF applied part per IEC 60601-1?

Accepted Answer

100 microamperes

Answer

10 microamperes

Answer

500 microamperes

Answer

50 microamperes

Question 6

A clinical engineer tests an electrocardiograph and finds the chassis leakage current is 450 µA. The correct action is to:

Accepted Answer

Remove the device from service immediately because it exceeds the 300 µA limit for general patient care areas

Answer

Continue using the device because it is below the 500 µA fault condition limit

Answer

Notify the manufacturer but keep the device in use pending replacement

Answer

Increase the grounding conductor size to compensate