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Try to  open a tin can with a hammer and  your efforts may lead to an injury, and you might not even get the can open. A similar result could occur if you try to extinguish a fire with the wrong type of fire extinguisher. Fires involving different substances create different conditions which make them ex¬≠tremely difficult to extinguish if the wrong type of fire extinguisher is used.

You owe it to yourself, your job and your family to know about the different classes of fire extinguishers so that you can react accordingly to extinguish a fire in an emergency situation. Take a moment and review these fire extinguisher classes:

1. Class A extinguishers are used on ordinary combustibles such as wood, paper, and textiles, where quen­ching and cooling effects are required. Of course, water is the most common type of Class A extinguishment. The ID symbol for Class A fire extinguishers is a green triangle.

2. Class B extinguishers are used for flammable liquid and gas fires, such as oil, gasoline, paint, and grease, where oxygen exclusion or flame interruption effect is essential. Class B extinguishers are identified by a red square with a letter "B" inside.

3. Class C extinguishers are used for fires involving electrical wiring and equipment where the non conductivity of the extinguishing agent is of first importance. For example, water solution extinguishers must not be used on electrical fires because the water conducts electricity and the operator may receive a shock from the energized electrical equipment via the water. A Class C extinguisher is identified by a blue circle.

4. Class D extinguishers are used for fires involving combustible metals, such as magnesium, potassium, powered aluminum, zinc, and sodium. Class D extinguishers are identified with a yellow star.

When a fire breaks out, your first action should be to call the fire department. When the fire is small, take fast action with the right extinguisher to put it out or keep it contained. Fire extinguishers are effective only when fires are in their first stages. It is essential that they be immediately accessible and promptly used.