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

Question 1

According to NFPA 99, what is the maximum allowable chassis leakage current for a patient-care–related electrical appliance in a general care area?

Accepted Answer

300 microamperes

Answer

100 microamperes

Answer

500 microamperes

Answer

50 microamperes

Question 2

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?

Accepted Answer

Patient auxiliary current

Answer

Chassis leakage current

Answer

Ground leakage current

Answer

Isolation leakage current

Question 3

Which standard is the primary US reference for safety requirements of medical electrical equipment?

Accepted Answer

ANSI/AAMI ES60601-1

Answer

NFPA 70 (NEC)

Answer

UL 508

Answer

IEC 61010-1

Question 4

An isolated power system (IPS) used in operating rooms primarily protects against:

Accepted Answer

Electrical shock from a single fault to ground while maintaining power continuity

Answer

Electromagnetic interference from surgical instruments

Answer

Voltage surges from the utility grid

Answer

Overheating of electrical panels

Question 5

What is the function of the line isolation monitor (LIM) in an isolated power system?

Accepted Answer

To continuously measure the impedance from each isolated conductor to ground and alarm when it falls below a safe threshold

Answer

To regulate voltage within the isolated circuit

Answer

To disconnect power automatically when a fault is detected

Answer

To filter harmonic distortion in the isolated circuit

Question 6

When performing an electrical safety inspection, what does the 'ground wire resistance' test verify?

Accepted Answer

That the protective earth conductor has sufficiently low resistance to safely carry fault current

Answer

That the device draws the correct amount of current from the outlet

Answer

That the device's insulation can withstand high-voltage stress

Answer

That the power cord meets minimum length requirements