ASE Light Duty Hybrid/Electric Vehicle 2

Question 1

Before disconnecting a high-voltage battery, what is the FIRST safety step a technician should take?

Accepted Answer

Remove the high-voltage service disconnect/manual service disconnect (MSD)

Answer

Removing the manual service disconnect isolates the high-voltage battery pack into safe, non-lethal segments before any service.

Question 2

What color are high-voltage cables typically marked on a hybrid or electric vehicle?

Accepted Answer

Orange

Answer

Orange insulation is the industry standard marking for high-voltage (50V or higher) wiring and cables.

Question 3

Which type of personal protective equipment is essential when handling exposed high-voltage components?

Accepted Answer

Class 0 insulated lineman's gloves

Answer

Class 0 rubber insulating gloves are rated to 1000V and protect technicians from electric shock during HV service.

Question 4

After de-energizing a high-voltage system, how long should a technician typically wait before touching components?

Accepted Answer

At least 5–10 minutes for capacitors to discharge

Answer

A waiting period of several minutes allows inverter and converter capacitors to fully discharge their stored energy.

Question 5

Which instrument should be used to verify that a high-voltage circuit is de-energized?

Accepted Answer

A CAT III rated digital multimeter

Answer

A properly rated (CAT III/IV) multimeter safely measures high voltage to confirm the circuit reads zero volts.

ASE Practice Test