Two-mode Safety and Battery System Service Safety Overview PowerPoint Presentation 1

Two-mode Safety and Battery System Service Personal Protective Equipment Required Recommended Precautions Electrical Safety Vehicle Safety

Personal Protective Equipment (PPE) Refers to the safety materials and equipment used when working nearby or servicing high voltage systems Proper guidelines and correct use of PPE should be executed each and every time a high voltage system is serviced Two types of PPE Required Recommended

Required Personal Protective Equipment Required PPE: Safety glasses with side shields Class 0 insulation gloves Class 0 insulation gloves are a protective system consisting of: Leather outer glove Rubber inner glove Rubber inner glove provides insulation against electrical current Protective leather glove shields the rubber insulation from being altered or destroyed Class 0 insulation gloves create a barrier between electrical current and user Danger: Class 0 insulation gloves resist voltage up to 1000 volts. Class 0 insulation gloves must be worn when servicing high voltage systems. If they are not used, serious injury or death may occur.

Required Personal Protective Equipment Class 0 insulation glove inspection procedure must be performed prior to servicing high voltage systems: Remove rubber glove from the outer leather protector Inflate the glove and pinch the opening tightly to seal the opening and prevent air loss Press the glove to increase pressure inside the glove, and inspect for pin holes, air leaks, wear, tear, or abrasions In addition to inspecting gloves, there is also a date stamp on each glove that must be certified up to date Each glove must be re – certified every six months, in order to ensure proper glove protection If any of the criteria mentioned are not met, do NOT use the gloves

Required Personal Protective Equipment Safety glasses, which must include side shields, are also a PPE requirement

Recommended Personal Protective Equipment Rubber soled shoes are recommended when working on high voltage systems These types of shoes are non – conductive, and help isolate the wearer from the earth ground

Recommended Personal Protective Equipment Because electrical shock is almost always associated with burns, it is recommended that non – synthetic clothing be worn when servicing high voltage systems Any cotton clothing is non – synthetic and suitable to wear when servicing these systems Wearing synthetic clothing may result in burns to skin, since this type of clothing melts at high temperatures

Recommended Precautions Before Servicing High Voltage Systems: Remove any jewelry that can conduct electricity and cause shock, such as: Watches Rings Necklaces Remove metal objects from pockets that may fall and create arc flash hazard, such as: Mechanical pencils Tools Remove or cover metal on clothing * Arc flash is produced when current suddenly flows due to loss of isolation between electrodes. Characterized by unexpected dissipation of instantaneous power across conductive path.

Recommended Precautions

Electrical Safety There are two factors of electricity on the body, voltage and current. Voltage - pressure that causes electron flow Current - flow of electricity through a circuit. (which could include the human body) The higher the voltage and current flow, the more severe damage to your body if it becomes part of the circuit.

Electrical Safety Current passing through the body can cause electric shock, resulting in potential injuries such as: Surface and internal tissue burns Broken bones and muscle damage resulting from falls At 16 mA, the muscles clamp on to whatever the person is holding. Nervous system effects  Breathing can stop at 30 mA. Ventricular fibrillation can occur at 75 to 100 mA.

Electrical Safety Ventricular fibrillation means the heart is twitching and there is no blood flow to the body. The heart can be damaged because it is in the path of most common pathways: Hand to hand Hand to foot

Electrical Safety Circuits completed through grounding: Across the Body: Across the Hand: To avoid these conditions: Use category III rated DMM and test leads rated to 1,000 volts when measuring the high voltage bus Use PPE

Electrical Safety When you become part of the circuit: Across the Body: Across the Hand: Pretty Obvious To avoid these conditions: Use category III rated DMM and test leads rated to 1,000 volts when measuring the high voltage bus Use PPE

Vehicle Safety High Voltage Interlock Circuit (HVIC) When any service cover is removed, the High Voltage source is interrupted to prevent access to energized electrical circuits Features: Manual Disconnect Lever HV DC cable extension cover PIM Motor Cable Cover Transmission Cable Access Cover Danger: The HVIC system should NOT be relied on to disconnect the high voltage sources to the vehicle, since this interlock circuit will have no effect if the high voltage contactors fail in the closed position. If the contacts were stuck, a cover could therefore be removed, and the system would still be active. Relying on the HVIC system to disable high voltage may cause serious injury or death.

Vehicle Safety “Live-Dead-Live” Live - Check your DMM against a known voltage source (vehicle’s 12 volt battery) Dead - Check circuits for no voltage present Live - Check DMM against same known voltage source to assure checks were valid

Vehicle Safety When Servicing a Two-mode Hybrid Vehicle Remember To: Wear PPE Verify vehicle is off and NOT in Auto Stop Attach keys and manual disconnect lever Store in a safe, secure place Never leave a high voltage system exposed Use a Category III DMM and test leads rated up to 1000 volts

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