All fire incidents can be divided in many ways depending on the cause of fire outbreak, but broadly there are two types of
fires, one is natural and other is manmade. Forest fires can be either due to natural or manmade reasons. All residential and
non- residential structural fires are largely manmade. Similarly, all industrial and chemical fires are due to explosions or fires
made by humans or due to machine failures.
Natural: Fires which are considered as natural are basically earthquake, volcanic eruption and lightning - generated fires.
The fire and explosion risk associated with an earthquake is a very complex issue. Compared with ordinary ( normal ) fires
the fire and explosion hazard related to earthquakes can constitute a substantial and heavy risk . Damage to natural gas systems during an earthquake is a major cause of large fires. Again probably the most significant direct impact of power systems on fire following an earthquake is that electric power is a major fire ignition source.In addition to dropped distribution
lines power circuits in damaged houses are another major ignition source.There have been cases where as many as two-thirds
of all ignitions after an earthquake has been attributable to power system.
Manmade:Fire caused by human/machine errors are considered as manmade fires,e.g.industrial or chemical fire disasters,fires
at social gatherings due to Electrical short circuit fires, accidental fire and kitchen-fires. Rural and urban residential and non- residential structural fires are also largely manmade fires. Any confined fire could be due to many reasons like,cooking fire confined to container, chimney or fuel fire confined to chimney, incinerator overload or malfunction,fuel burner / boiler malfunction, and trash fire.
Open flame or ember
Appliance, tool or air conditioning
Other heat source
Natural causes: earthquake, volcanic eruption and lightening