Ignition sources

The late Dr Trevor Kletz used to say "Ignition sources are free". We often tend to overlook all potential sources and focus on only the obvious sources. These include:

• Cigarettes/matches etc
• Cutting and welding
• Hot surfaces
• Dryers and furnaces
• Sparks due to impact
• Sparks from electrical equipment;
• Vehicles 
• Mobile phones

These are some additional sources of ignition you should consider: 

• Space heaters
• Spontaneous heating
• Friction heating
• Stray currents from electrical equipment
• Static electricity
• Lightning strikes
• Electromagnetic radiation of different wavelengths