The ignition sources associated with a Class B fire primarily involve flammable or combustible liquids and gases that can easily ignite and sustain combustion. These sources include:

• Sparks or open flames from static electricity, matches, or other ignition devices.
• Heat sources such as hot surfaces, welding equipment, or any equipment that generates high temperatures.
• Electrical equipment that is malfunctioning or improperly used, potentially causing sparks.
• Spills or leaks of flammable liquids or gases that come into contact with ignition sources.

Summary

In essence, any source that provides enough heat or a spark to ignite flammable liquids or gases—such as petrol, oil, alcohol, propane, or butane—is associated with ignition of a Class B fire. Proper handling, storage, and use of these materials, along with ignition source control, are key to preventing such fires.