First Response at a Live-Wire and Fuel-Spill Road Crash
At 11:30 p.m., a constable is the first responder to a collision on National Highway 48 near Nelamangala. A car has struck a two-wheeler and come to rest against a roadside electric pole. An 11 kV overhead line has snapped and lies across the road, sparking. Petrol is leaking from the car's fuel tank and pooling near the bike. Two people are injured: a man in his 40s is lying face down, unconscious and not breathing normally; a woman has a deep cut on her forearm that is bleeding heavily and a red, blistering burn on her right hand. Six bystanders are shouting, and one is about to throw a bucket of water on the sparking wire while another is pulling the unconscious man by the arm. The constable has a first-aid kit, a flashlight, and a radio, but no insulated gloves. The ambulance is 12 minutes away.
1. In what order should the constable act to control the scene, and why?
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The correct order is: stop the two dangerous bystander actions first, then isolate the area, then call for specialist help, then treat the injured.
- Stop the water and the pulling. Shout clearly that the wire is live and that no one should touch the injured man or the wire. A bucket of water on an 11 kV line can electrocute the thrower and anyone in the puddle. Pulling the unconscious man may worsen a spinal injury and expose the rescuer to the live wire.
- Create distance. Keep people at least 10 metres from the fallen high-voltage conductor, because the ground around it can carry dangerous step potential. Do not use the flashlight near the fuel or touch anything metallic.
- Call the electricity utility to confirm the line is switched off, and call the fire service. Do not approach the wire until the utility confirms isolation.
- Control ignition sources around the petrol pool: no smoking, no vehicle engines, no mobile phone use close to the spill.
- Only after the scene is safe should the constable triage the injured and begin first aid.
2. What first aid should be given to the two injured persons, and what should be avoided?
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Unconscious man, not breathing normally: after the scene is safe, check response and breathing. If he is not breathing normally, start CPR: 30 chest compressions to 2 rescue breaths, compressions at 100–120 per minute, depth 5–6 cm, allowing full chest recoil. Because he is face down and a spinal injury is possible, use a log roll with helpers to turn him, keeping the head, neck, and spine aligned; do not twist the neck. If CPR must be started, airway and circulation take priority over spinal precautions.
Woman with bleeding and burns: apply direct pressure to the forearm wound with a clean cloth or sterile dressing and elevate the arm; do not use a tourniquet unless bleeding is uncontrolled. For the burn, cool it with clean running water for about 20 minutes, remove rings or tight items before swelling, and cover with a sterile non-stick dressing. Do not apply ice, toothpaste, oil, or ointment, and do not burst blisters. Keep both patients warm and monitor breathing until the ambulance arrives.
3. Explain the science behind two hazards here: why water on the live wire is dangerous, and why the petrol leak creates an explosion risk.
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Water and electricity: ordinary water contains dissolved ions, so it conducts electricity. A stream of water from a bucket creates a continuous conductive path from the live conductor to the person holding it, causing electric shock. Wet ground also spreads current, creating step potential. That is why water must never be thrown on a live electrical fire or wire.
Petrol leak: petrol is highly volatile. Its vapour is heavier than air and can travel along the ground, pooling in low spots. Petrol vapour has a very low flash point and can ignite with a tiny spark, including a car starter, a cigarette, or a mobile phone. The vapour-air mixture can explode if it falls within its flammable range. The leaking tank therefore turns the whole area into an ignition-risk zone until the fuel is contained and the area is ventilated and cordoned.