Podcast
Questions and Answers
What is the potential danger when proper safety procedures are not followed while working on electric and hybrid electric vehicles?
What is the potential danger when proper safety procedures are not followed while working on electric and hybrid electric vehicles?
- No danger
- Serious injury (correct)
- Mild discomfort
- Minor injury
Who should not service or repair electronic medical devices such as cardiac pacemakers?
Who should not service or repair electronic medical devices such as cardiac pacemakers?
- Technicians who rely on them (correct)
- Doctors
- Nurses
- Patients
How are HV components identified?
How are HV components identified?
- By shape
- By material
- By warning labels and colors (correct)
- By weight
What voltage represents a shock hazard?
What voltage represents a shock hazard?
What safety equipment should be worn when working on or near a potential HV circuit or component?
What safety equipment should be worn when working on or near a potential HV circuit or component?
What can happen if there is accidental and unprotected contact with any electrically charged HV component?
What can happen if there is accidental and unprotected contact with any electrically charged HV component?
How can a vehicle be powered?
How can a vehicle be powered?
What type of digital multimeter is required for making measurements on high-voltage systems?
What type of digital multimeter is required for making measurements on high-voltage systems?
What are the different categories of voltage standards for meter and meter leads according to the IEC?
What are the different categories of voltage standards for meter and meter leads according to the IEC?
Which meter is a higher-rated meter than CAT I for HV measurements?
Which meter is a higher-rated meter than CAT I for HV measurements?
What do insulated hand tools provide?
What do insulated hand tools provide?
What is used in the HV system to detect opens in circuits and keep the vehicle safe?
What is used in the HV system to detect opens in circuits and keep the vehicle safe?
Flashcards
Danger of ignoring safety procedures
Danger of ignoring safety procedures
Serious injury can occur.
Who should NOT repair medical devices?
Who should NOT repair medical devices?
Technicians who rely on electronic medical devices should not service or repair similar devices.
Identifying HV components
Identifying HV components
HV components are identified by warning labels and distinctive colors.
Shock hazard voltage
Shock hazard voltage
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Required safety equipment
Required safety equipment
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Consequences of unprotected HV contact
Consequences of unprotected HV contact
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Vehicle Power Sources
Vehicle Power Sources
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DMM for HV systems
DMM for HV systems
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Voltage standard categories
Voltage standard categories
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Higher-rated meter than CAT I
Higher-rated meter than CAT I
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Insulated hand tools purpose
Insulated hand tools purpose
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HV system safety devices
HV system safety devices
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Study Notes
- Electric and hybrid electric vehicles use high-voltage circuits that can cause serious injury or death if proper safety procedures are not followed.
- Electronic medical devices such as cardiac pacemakers should not be serviced or repaired by technicians who rely on them.
- HV components are identified with warning labels and colors.
- Low voltage does not represent a shock hazard, but high voltage over 60 volts does.
- Eye protection and HV gloves should be worn when working on or near a potential HV circuit or component.
- Accidental and unprotected contact with any electrically charged HV component can cause serious injury or death.
- The vehicle may be powered by the electric motor only, gasoline engine only, or a combination of both.
- A category three (CAT III) certified digital multimeter is required for making measurements on high-voltage systems.
- The IEC has several categories of voltage standards for meter and meter leads.
- CAT II is a higher-rated meter than CAT I for HV measurements.
- Different types of meters and tools are required for working on hybrid and electric vehicles.
- Meters are rated by CAT levels, with higher levels providing greater protection.
- Insulated hand tools provide an additional margin of safety.
- The HV system uses contactors or relays to detect opens in circuits and keep the vehicle safe.
- Local interlocks detect opens in LV circuits and trigger the controller to depower the HV circuits.
- Service information procedures must be followed to safely depower the vehicle before working on certain components.
- Orange cables run under the vehicle and caution must be used when hoisting or using a floor jack.
- HV cables cannot be repaired and are expensive to replace.
- After servicing, orange HV cable ends should be taped and the vehicle should be marked with a "HIGH VOLTAGE - DO NOT TOUCH" sign.
- Electric and hybrid vehicles emit warning sounds at low speeds to warn pedestrians.
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