Presentation on theme: "Two-mode Safety and Battery System Service"— Presentation transcript:
1Two-mode Safety and Battery System Service Safety OverviewPowerPoint Presentation 1
2Two-mode Safety and Battery System Service Personal Protective EquipmentRequiredRecommendedPrecautionsElectrical SafetyVehicle Safety
3Personal Protective Equipment (PPE) Refers to the safety materials and equipment used when working nearby or servicing high voltage systemsProper guidelines and correct use of PPE should be executed each and every time a high voltage system is servicedTwo types of PPERequiredRecommended
4Required Personal Protective Equipment Required PPE:Safety glasses with side shieldsClass 0 insulation glovesClass 0 insulation gloves are a protective system consisting of:Leather outer gloveRubber inner gloveRubber inner glove provides insulation against electrical currentProtective leather glove shields the rubber insulation from being altered or destroyedClass 0 insulation gloves create a barrier between electrical current and userDanger: Class 0 insulation gloves resist voltage up to 1000 volts.Class 0 insulation gloves must be worn when servicing high voltagesystems. If they are not used, serious injury or death may occur.
5Required 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 protectorInflate the glove and pinch the opening tightly to seal the opening and prevent air lossPress the glove to increase pressure inside the glove, and inspect for pin holes, air leaks, wear, tear, or abrasionsIn addition to inspecting gloves, there is also a date stamp on each glove that must be certified up to dateEach glove must be re – certified every six months, in order to ensure proper glove protectionIf any of the criteria mentioned are not met, do NOT use the gloves
6Required Personal Protective Equipment Safety glasses, which must include side shields, are also a PPE requirement
7Recommended Personal Protective Equipment Rubber soled shoes are recommended when working on high voltage systemsThese types of shoes are non – conductive, and help isolate the wearer from the earth ground
8Recommended 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 systemsAny cotton clothing is non – synthetic and suitable to wear when servicing these systemsWearing synthetic clothing may result in burns to skin, since this type of clothing melts at high temperatures
9Recommended Precautions Before Servicing High Voltage Systems:Remove any jewelry that can conduct electricity and cause shock, such as:WatchesRingsNecklacesRemove metal objects from pockets that may fall and create arc flash hazard, such as:Mechanical pencilsToolsRemove 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.
11Electrical SafetyThere are two factors of electricity on the body, voltage and current.Voltage - pressure that causes electron flowCurrent - 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.
12Electrical SafetyCurrent passing through the body can cause electric shock, resulting in potential injuries such as:Surface and internal tissue burnsBroken bones and muscle damage resulting from fallsAt 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.
13Electrical SafetyVentricular 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 handHand to foot
14Electrical 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 voltswhen measuring the high voltage busUse PPE
15Electrical Safety When you become part of the circuit: Across the Body:Across the Hand:Pretty ObviousTo avoid these conditions:Use category III rated DMM and test leads rated to 1,000 voltswhen measuring the high voltage busUse PPE
16Vehicle Safety High Voltage Interlock Circuit (HVIC) When any service cover is removed, the High Voltage source is interrupted to prevent access to energized electrical circuitsFeatures:Manual Disconnect LeverHV DC cable extension coverPIM Motor Cable CoverTransmission Cable Access CoverDanger: 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.
17Vehicle Safety “Live-Dead-Live” Live - Check your DMM against a known voltage source (vehicle’s 12 volt battery)Dead - Check circuits for no voltage presentLive - Check DMM against same known voltage source to assure checks were valid
18Vehicle Safety When Servicing a Two-mode Hybrid Vehicle Remember To: Wear PPEVerify vehicle is off and NOT in Auto StopAttach keys and manual disconnect leverStore in a safe, secure placeNever leave a high voltage system exposedUse a Category III DMM and test leads rated up to 1000 volts