Common Causes: The most common reason of fire? • Ignorance • Carelessness Main Cause of Fire There are ten main cause of fire such as: 1. Electric Short Circuits 2. Oil Leakage 3. Hot Work 4. Accidents with Heater and Stoves 5. Furnaces and Metal Floor Grills Main Cause of Fire 6. Kitchen Fires 7. Careless Smoking 8. Overheating of Mechanical Equipments 9. Accidents 10. Violence Common Substances subject to Spontaneous Heating Charcoal: Wetting and insufficient ventilation. Rubber: Pre-heating. Cooking oils: Oil wetting and poor Ventilation. Common Substances subject to Spontaneous Heating Fish meals: excess storage temperature, improper moisture content. Linseed oil: oil soaked rags and fabrics, improper ventilation. Varnished fabrics and furniture: poor ventilation, moisture. Different Types of Ignition Sources 1. Physical Sources 2. Chemical Sources 3. Biological Sources 4. Electrical Sources Physical Sources These ignition sources are the result of some physical phenomenon. Rubbing or Abrasion: Heat is generated due to rubbing in different bodies, such that no chemical charge is involved. Friction: Different when in operation produces fractional spark which can be due to shortage of lubricating oils, gases etc. Physical Sources Electrically Operated Appliances: Unattended hot electric bulbs and similar appliances in the surrounding objects due to the heat released by them. Careless Smoking: Unattended fires and careless smoking often set fires in different combustible. Chemical Sources A large number of fires are resulted due to mixing of chemical substances Sulphuric acid and nitroglycerine. Various gases, such as hydrogen and chloride. Chemical of exothermic nature. Highly reactive non metals such as phosphorus, sodium and potassium. Biological Sources There is such microorganism which, when act on certain materials heat is produced the quantity of heat produced sometimes is sufficiently high on the appears in the form of spontaneous ignitions, such as: Biological Sources Fire in rice straw stores. Heat due fermentation processes. Fires in raw hemp staples. Electrical Sources Electricity appears to be main source of ignition in different forms. Short circuiting. High voltage discharge. Heated filament High voltage static charge or discharge. THANKS