Best for wood , cloth, paper, plastics, coal, etc. fires involving solids.
Not used on burning fat or oil or on to electrical appliances.
Point the jet at the base of the flames and keep it moving across the area of the fire
Ensure that all the areas of fire are out.
The effectiveness of an extinguishing agent on fires of ordinary solid combustible materials – such as wood, paper, textiles and fabrics (Class A risks) – depends principally upon its cooling action. Water has better cooling properties than other agents and is best for use on fires involving those materials that may re-ignite if not adequately cooled. Also, water can penetrate readily to reach a deep-seated fire.
Wetting agents in the extinguishant may enhance this ability.
Water conducts electricity and must not be used on live electrical equipment.
However, in workplaces containing limited quantities of electrical equipment – for example, where there are lights, wiring and a few small motors only – it is not always
necessary to provide special extinguishers to supplement the protection given by
The advantages of water are as follows:
• good absorbance of heat;
• cost effective;
• readily available;
• long range of jet; and
• good striking power of jet.
Water is the most common extinguishing medium.
There are limitations in its use as it is only suitable for Class A materials.
However, Class A materials are by far the most common fuel source, hence the popularity of the medium.
Water conducts electricity and is not suitable for electrical fires, nor should it be used on flammable liquids (as it may splash and spread the fire), flammable gases (as it may
put out a fire, only for it to re-ignite explosively), and flammable metals and cooking oil fires (as it reacts violently, making the fire worse).