Fire in the workplace can have a number of causes. It is essential to recognise the different types of fire, as the correct treatment of one can prove disastrously wrong for another.

Fires are classified as follows:

• Class A Fires

Freely burning fires, fuelled by ordinary combustible materials, such as cloth, wood and paper. Furniture, waste paper baskets, stationary stores, cleaner’s rooms and waste disposal units are among the main danger areas. Cooling by water or spray foam are the most effective ways of extinguishing this type of fire.

• Class B Fires

Fires fuelled by flammable liquids & gasses such as, oils, spirits, petrol, greases, fats, propane, butane and LGP or acetylene. Tackling with foam, CO2 or dry powder are the most effective ways of extinguishing this type of fire.

• Class C Fires

Fires in the presence of a live electrical current. It is imperative that the power supply is disconnected. Fires involving Electrical Risks can then be dealt with according to the classification it falls into above. When the power cannot be isolated and there is a risk of electrical shock, non-conductive extinguishing agents, such as dry powder, CO2 or Halon (BCF), can be used. Ventilating systems, computer rooms, control rooms, switchgear and lift motor rooms are among the main danger areas.

• Vehicle Fires

Dry powder is the most effective way of extinguishing vehicle fires.

• Class D Fires

None of the extinguishing agents referred to on these pages will deal effectively with a fire involving metals. These fires should only be dealt with using special extinguishers by personnel trained in handling combustible metals, for example: aluminum, magnesium, sodium and potasium.

• The Environmental Impact of Halon (BCF)

Halon (BCF) contributes to the harmful depletion of the ozone layer. Its production and use are controlled under the Montreal Protocol. KEVCOR no longer promotes the sale of Halon (BCF) portable extinguishers and are prohibited from discharges such extinguishers .