Facts about Electric Shock

  • It is the magnitude of current and the time duration that produces effect. That means a low value current for a long duration can also be fatal. The safe current/time limit for a victim to survive at 500mA is 0.2 seconds and at 50 mA is 2 seconds.
  • The voltage of the electric supply is only important as it ascertains the magnitude of the current. As Voltage = Current x Resistance, the bodily resistance is an important factor. Sweaty or wet persons have a lower body resistance and so they can be fatally electrocuted
    at lower voltages.

  • Let-go current is the highest current at which subject can release a conductor. Above this limit, involuntary clasping of the conductor is present. It is 22 mA in AC and 88 mA in DC.
  • Apart from electric shock the other equally dangerous hazards of playing (or working) with electricity are electrical arc flash and electrical arc blast.
  • Placing your hand in your pocket may protect you by preventing a current from traveling through the heart making a shock non-lethal.
  • The severity of the electric shock depends on the following factors: body resistance, circuit voltage, amplitude of current, path of the current, area of contact, and duration of contact.
  • Death may also occur from falling in case of electric shock.
  • Burn injury may occur at both the entrance and exit of the current.
  • Low frequency AC is more dangerous than high frequency AC.
  • AC and DC both kill so treat them with respect.
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