Carpentry 1 - Fire prevention and control
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What are the 3 elements necessary for fire to occur?
Is sufficient oxygen available to support a fire on a construction site?
List the 4 classifications of fire
- 1. Class A - ordinary combustibles
- 2. Class B - flammable liquids
- 3. Class C - electrical
- 4. Class D - combustible metals
What is the difference between the fire fighting capacity of a 4A and an A ULC rated extinguisher?
4A has 4 times the capacity
What must take place in solids and liquids before burning can occur?
vaporization of the surface
Who is responsible for maintaining a portable extinguisher once it is in service?
What are the 3 goals of a 'fire watcher'?
- To prevent:
- 1. Fire
- 2. Personal injury
- 3. Property damage
What is the primary safety feature of an industrial site?
Automatic sprinkler system
When is it safe to enter a building after a fire?
When 'all clear' signal is given
List the 4 steps of proper portable extinguisher use
What is a good example of a 'stable fuel' for a fire?
What is an example of an unstable fuel?
What has to happen for fuel to ignite?
Increase temperature of the fuel to a point where sufficient vapors are given off to allow ignition to occur.
What are the 3 forms of possible ignition?
- 1. Piloted - flame or spark
- 2. Auto - temperature high enough
- 3. Spontaneous - temperature above auto-ignition temp (varnish on a rag)
How are Class A & B fire extinguishers rated?
What kind of fire extinguisher can be used for all, except Class D (combustible metals)?
Multipurpose dry chemical
Which extinguisher type is only good for ordinary type combustibles?
What kind of fire are carbon dioxide and dry chemical extinguishers good for? (2)
- 1. Class B (flammable liquids) and
- 2. Class C (electrical equipment
Which type of extinguisher should you use for Class D (combustible metals)?
Special extinguisher agents approved by recognized testing laboratories
How are carbon dioxide cylinders serviced?
Weighed to determine the extinguishing agent remaining
Where should you shoot the fire?
At the base
What should you NEVER use in the evacuation of a building?
Elevator. Take the stairs, Lazy.
What are the 3 signals of a fire alarm system?
- 1. Alarm (immediate action)
- 2. Supervisory (problem with sprinkler system)
- 3. Trouble (fault in monitored circuit)
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