Presentation on theme: "Extrication Concerns Hybrid / Electric SRS (airbags) High Intensity Discharge (HID) lights."— Presentation transcript:
Extrication Concerns Hybrid / Electric SRS (airbags) High Intensity Discharge (HID) lights
Hybrid and Electric Vehicles Have Parallel Electric Systems 12 Volt High Voltage DC + 110/220 AC 12V system controls: ignition, lighting, radio AC voltage is strictly for propulsion and other motorized requirements (AC, power steering) WARNING A silent car is not necessarily off. Look at the dash/gages Turn Key off when possible KEY FACT 12V system controls relays in the high voltage battery system. Removing 12V power opens these relays and disables electric propulsion system.
Supplemental Restraint System (SRS or airbag system) Composed of four major components: Sensors Impact Speed Deceleration/ Accelerometers Processing Unit 12V Power system Airbags
SRS cont. Basic Functionality Processing Unit causes one or more airbags to discharge based upon sensor inputs. No single input can trigger a discharge Parked cars that are hit do not discharge airbags No accel/decel or speed input Sudden stop of itself does dot trigger airbag No impact WARNING compressed gas cylinders remain a concern for cutting. Peel before you cut. KEY FACT Turning key off and disconnecting 12V safely disables SRS airbag deployment.
HID Lights Same operation as Arc lights – Arc is generated across a gas (xenon) that is excited by the arc Voltage is stepped up from 12V to 20,000V by the igniter to ignite the arc and 85V from the ballast to keep it active. HID produce more light because the energy is released as light and not heat. The voltage step up is similar to the process used by tasers. Allows low volt power source (i.e. 9V battery) to increase to 5000V. KEY FACT HID lights are potential electrocution hazards and fire/ignition hazards.
Takeaways 1.All vehicles on the road today have a 12V system with a battery. 2.All systems of concern can be safely disabled by removing the 12V battery from the circuit. 3.Hybrid Electric Vehicle concerns are reduced to common concerns. 4.Slight variation in our current procedure can address all concerns
MVC Procedure E9-1 First due apparatus Key goals: size up and scope of the incident Number of vehicles Number of patients Hazards (power, water, fuel, stability) Scene safety / containment determine need for extrication stabilize vehicles PT contact / prioritization (triage) Extrication as needed
E9-1 En Route Determine approach options (if any) Determine personell roles (EMT = pt care) Listen for updates and other responding units
E9-1 On Scene DO and Officer discuss placement Park to protect the scene Size up for dangers that may increase distance (down power lines/poles, hazmat, livestock, etc.) Determine priority vehicle for stabilization Individual roles Line selection Fully Packed up and on air before approaching vehicles
E91 D.O. Park apparatus as decided Engage pump Engage compressor (autobalance or fixed) Foam on Open tank to pump and re-circ valves Set wheel chocks Start generator Set Cones (if time) Charge attack line when requested Man the attack line when flow is established by nozzle. When relieved, set cones and man engine.
E9-1 Crew Leader On Scene Size up and establish IC as needed Perform walk around of incident all the way around if possible check under vehicles direct crew to place chocks PT access as possible Put vehicle in Park Set emergency brake if possible. Maximize PT access by using all electrical switches available (unlock doors, pop hood and trunk, windows down. Move electric seats if possible. Turn key off – remove Turn headlights off Turn hazards on Give crew OK to disconnect battery Off air / doff packs if hazards clear
E9-1 Nozzle Stretch chosen line to safe distance with optimal coverage. Get line charged and verify flow. Give hand line to DO Retrieve small MVA bag from engine and any remaining chocks/cribbing as needed. Work with Tools/CL to stabilize, deflate tires CL may divert to PT care Get OK from CL to disconnect battery Work with Tools to gain access to battery and disengage If no battery access, clip wires from main fuse block Confirm Hazards off Doff packs? Continue with extrication / tool deployment as needed
E9-1 Tools Obtain Irons (halligan & axe) Obtain step chocks and set on the primary vehicle Work with Nozzle to get chocks set and tires deflated on all vehicles. CL may divert to PT care When CL OK’s, gain access to Battery Confirm hazards off Doff packs? Continue with tool deployment / extrication as needed.
Rescue 9-11 Second due apparatus Park out of traffic and outside the scene or inside the scene if access affords. IC will direct to pack up or not IC will direct to either PT care, extrication, or other needs Most likely PT care Bring forward med bags, backboards, towel rolls Obtain the IC or CL plan for extrication, primary vehicle and primary PT designation.
Command 9 (Officer POV) Second or third due apparatus Park to minimize traffic exposure and scene obstruction. If first on scene, establish IC, size up, Consider 360? If second On Scene assume IC Get incident overview from CL PT count Extrication efforts and needs Other needs Safety concerns What is the current plan and objective Consider secondary survey for ejected or mobile PTs.
T9-5/ T9-4 Third or fourth due apparatus Park to protect the scene and extend scene If no extrication or PT care needs, set more cones and assist with traffic control.