Fire Safety

What is the fire triangle?

• AA warning sign on construction sites
• BThree elements required for fire: fuel, oxygen, and heat/ignition source✓
• CA monthly safety meeting
• DA brand of fire extinguisher

Answer: The fire triangle illustrates that fire requires fuel (combustible material), oxygen (usually present), and heat. Removing any element extinguishes fire. This concept guides fire prevention and control.

What colour extinguisher is used for ordinary combustible fires (wood, paper, textiles)?

• ARed✓
• BBlue
• CBlack
• DYellow

Answer: Red extinguishers contain water and suppress Class A fires (wood, paper, textiles). Blue (Class B), black (Class D), and yellow (Class C) are for other fire classes.

What should be the first action if a fire starts on a construction site?

• AAttempt to extinguish it immediately
• BEvacuate everyone and call the emergency services (999)✓
• CHide until help arrives
• DContinue work nearby but avoid the flames

Answer: Safety priority: evacuate all personnel and alert emergency services. Attempted suppression by untrained workers risks injury. Firefighters handle suppression.

What is the purpose of a fire warden on a construction site?

• ATo start fires
• BTo patrol for fires continuously
• CTo coordinate evacuation, account for personnel, and report to emergency services✓
• DTo use all extinguishers

Answer: Fire wardens organise evacuation, conduct headcounts, and liaise with emergency responders. They do not patrol constantly or suppress fires; they prioritise personnel safety.

Which type of fire extinguisher should NOT be used on electrical fires?

• ACO2
• BFoam
• CWater✓
• DDry powder

Answer: Water conducts electricity, risking electrocution. CO2, foam, and dry powder are safe for electrical fires. Water is suitable only for Class A fires (wood, paper).

What should be done to prevent fires on a construction site?

• AAssume fires won't happen
• BKeep sources of ignition (naked flames, hot work) away from combustibles, maintain clear evacuation routes, and ensure extinguishers are accessible✓
• COnly respond after a fire starts
• DFire prevention is unnecessary during the day

Answer: Fire prevention is proactive: segregate fuels from ignition sources, maintain escape routes, position fire equipment, and use hot work permits. Assumption and reaction are inadequate.

Under UK law, what must be provided on construction sites for fire detection and alarm?

• ANothing; sites are exempt
• BAdequate fire detection, alarm systems, and escape routes appropriate to site size and risk✓
• COnly during winter
• DOnly if workers request them

Answer: Regulatory Fire Safety Order and Management Regulations require fire detection, alarm systems, and clearly marked emergency exits proportionate to site risk and occupancy.

If a worker discovers a fire in its early stages and feels confident to suppress it, when should they attempt extinguisher use?

• AImmediately and alone
• BOnly if escape route is clear, they are trained, the fire is small, and evacuation is underway✓
• COnly if management approves
• DNever; evacuation is always the priority

Answer: Attempted suppression is only safe if: route is clear, training exists, fire is small, and evacuation proceeds. If any condition is absent, evacuate. Life safety trumps asset protection.

What information should be displayed on or near a fire extinguisher?

• AThe date it was purchased
• BThe colour, Class of fire it handles, and instructions for use✓
• CThe cost
• DThe supplier name

Answer: Labels on extinguishers indicate colour (identification), fire class, and operating instructions. This enables quick, correct selection during emergencies.

A construction site is to be evacuated due to fire. Which group should leave FIRST?

• AManagement and supervisors
• BThe nearest people and those at highest risk (disabled, injured)✓
• CSkilled workers only
• DNo specific order; everyone leaves simultaneously

Answer: Evacuation priority: assist those with mobility issues first; able-bodied people self-evacuate. Systematic priority prevents congestion and ensures vulnerable people reach safety.

What is a 'hot works permit' in construction and when is it required?

• APermission to use heated tools
• BA formal authorisation for fire-risk work (welding, grinding, cutting) specifying precautions (fire watch, area isolation, extinguishers) before work begins; required when working near combustible materials✓
• CPermission to use hot water on site
• DOnly required by the fire brigade

Answer: Hot works permits authorise high-risk tasks with documented fire controls. They're required near combustibles to prevent fires. Hot water and heated tools are low-risk and don't require permits. The contractor issues permits, not only fire brigade.

How must flammable liquids (paints, solvents, petrol) be stored on a construction site to minimise fire risk?

• AIn clear plastic containers so they're visible
• BIn approved, lockable metal or plastic cabinets, with adequate ventilation, away from ignition sources and oxidising substances; quantities stored must be minimised✓
• CIn any available container on site
• DOutside in the rain to keep them cool

Answer: Flammable liquid storage requires approved containers (metal cabinets are standard), ventilation (preventing vapour accumulation), segregation from ignition sources, and quantity limits. Visibility, repurposing containers, and outdoor exposure increase risks.