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EV Safety Course
EV Safety Chapter 3
Summary Outline:
Electrical Arc Faults and Arc Blasts:
Arc faults occur due to compromised insulation or separation between high-voltage conductors.
Arc blasts can reach temperatures of 35,000°F, causing molten metal shrapnel, toxic smoke, and acoustic waves.
Dedicated EV Work Bays and Safety Precautions:
Importance of having a designated area for servicing high-voltage vehicles.
Use of steering wheel covers and body rescue hooks (shepherd’s poles) for emergency situations.
High-Voltage Cable Protection and Vehicle Lifting:
Proper lifting techniques to avoid damaging high-voltage cables.
Risks associated with thermal runaway due to battery damage during lifting.
Insulated Tools and Equipment:
Use of tools certified with a double triangle symbol for high-voltage work.
Inspection and proper usage of insulated tools according to their intended design.
Capacitor Discharge Procedures:
Differences between passive discharge (5-15 minutes) and active discharge (less than 5 seconds).
Active discharge triggered by airbag deployment during accidents.
Power Steering and Battery Systems:
Understanding the different voltages in electronic power steering systems (12V and 42V).
Importance of using non-conductive oils in high-voltage air conditioning compressors.
12V Battery Service and Cooling Systems:
Precautions when servicing 12V batteries, including checking manufacturer guidelines.
Hot storage tanks in hybrid vehicles that maintain operating temperatures for up to three days.
Thermal Runaway and Quarantine Protocols:
Dangers of lithium battery fires, which do not require oxygen to burn.
Quarantine procedures for vehicles involved in accidents to prevent thermal runaway.
Fire Extinguishing Challenges with Lithium Batteries:
Limitations of traditional fire extinguishing methods for lithium battery fires.
Evacuation protocols when a fire originates from a high-voltage battery.
Level 1 Charging and Breaker Panel Issues:
Troubleshooting tips for tripped breakers during Level 1 charging at home.
Adjusting charging settings to prevent overloading the electrical system.
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