Stri Bhun Hatya

Hazards of Electricity
1. Electric Shock 2. Fire / Short Circuit 3. Electric Burns

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Electric Shock

It is sudden & accidental stimulation of the body’s nervous system by electric current. It is the result of passage of electric current through the human body

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• Most widely recognised danger of electricity. • When a person standing on the ground touches a live wire, or touches a live tool or machine with poor insulation or hits a live cable, then a person becomes conductor, and the shock that a person feel is the electrical current going through the body of the person. • Shock can cause : - pain,burn - loss of muscle control and coordination - Internal bleeding - nerve, muscle or tissue damage - cardiac arrest or death.

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Fundamentals of Electrical Hazards
 More than 3 ma painful shock  More than 10 ma muscle contraction “no-let-go” danger  More than 30 ma lung paralysis- usually temporary  More than 50 ma possible ventricular fib. (heart dysfunction, usually fatal)  100 ma to 4 amps certain ventricular fibrillation, fatal  Over 4 amps heart paralysis; severe burns. Usually caused by >600 volts
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Voltage
AC or DC Level Frequency

28/03/2013
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Prashant Srivastava

5
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28/03/2013
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Prashant Srivastava

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FACTORS ON WHICH INTENSITY OF ELECTRIC SHOCK DEPENDS:
The current strength. The body resistance. Frequency of current. The path taken by the current through the body.
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Area of contact.

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Primary Hazards
Electric Electric Electric Electric shock fire & explosion flash burns

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Secondary Hazards
Person falling from height Dropping of tools & objects Health hazards due to release of toxic gas & production of UV rays Psychological effects Emotionally anxious Distracted More prone to accidents
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Body Resistance
Body area Resistance (ohms) 1,00,000 to 6,00,000 1000

Dry skin

Wet skin