● Class are fires involving gas spilled liquefied gas.
Fires are divided into four classes categories:
● Class are wood, paper and textile fires.26
Basic Electrical Installation Work
Oxygen
Oxygen all around the air breathe, but can eliminated from
a small fire smothering with fire blanket, sand foam.
Most substances will burn they are high enough temperature and
have supply oxygen.
Heat
Heat can removed from fire dousing with water, but water must
not used burning liquids since the water will spread the liquid and
the fire.
Safety First
Fire
If you discover fire:
● raise the alarm;
● attack small fires with an
extinguisher;
● BUT only you can without
risk your own safety. Closing doors
and windows, but not locking them will limit the amount oxygen avail-
able fire building and help prevent spreading.
Fires industry damage property and materials, injure people and some-
times cause loss life.
Electrical fires not have special category because, once started, they
can identified one the four above types.
.
● Class are liquid fires such paint, petrol and oil.
Only attack the fire you can without endangering your own safety
in any way. The minimum temperature which sub-
stance will burn called the ‘minimum ignition temperature’ and for most
materials this considerably higher than the surrounding temperature. Some fire extinguishers have cooling action which removes heat
from the fire.
● Class are very special types fire involving burning metal. Always leave your own exit from the danger zone clear. Everyone should make effort prevent fires, but
those which break out should extinguished quickly possible.
A safe distance must maintained between heat sources and all flamm-
able materials. Those
not involved fighting the fire should walk safe area assembly
point.
However, danger does exist from portable heaters, blow torches and hot
air guns which provide heat and can cause fire raising the temperature
of materials placed their path above the minimum ignition temperature.
In the event fire you should:
● raise the alarm;
● turn off machinery, gas and electricity supplies the area the fire;
● close doors and windows but without locking bolting them;
● remove combustible materials and fuels away from the path the
fire, the fire small, and this can done safely;
● attack small fires with the correct extinguisher
