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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

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extrication concerns

Extrication Concerns

Hybrid / Electric

SRS (airbags)

High Intensity Discharge (HID) lights

hybrid and electric vehicles
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
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
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
  • WARNINGcompressed 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
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.

All vehicles on the road today have a 12V system with a battery.

All systems of concern can be safely disabled by removing the 12V battery from the circuit.

Hybrid Electric Vehicle concerns are reduced to common concerns.

Slight variation in our current procedure can address all concerns

mvc procedure e9 1
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
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
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
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
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
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
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
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
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
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.