Fire and Emergency

Overview

Fire is one of the most serious hazards on construction sites and in buildings where electrical work takes place. Electricians must understand fire prevention, know how to respond in an emergency, and be able to identify the correct extinguisher for each type of fire.

Electrical faults are one of the leading causes of fires in buildings. As an electrician, your work directly affects fire safety, making this topic doubly important for your professional practice.

At a Glance: This topic covers the fire triangle, extinguisher types and colour codes, evacuation procedures, fire prevention, and hot work permits. Focus on memorising the extinguisher table, understanding the fire triangle, and knowing the correct evacuation steps.

The Fire Triangle

A fire requires three elements to start and sustain itself. Removing any one of these elements will extinguish the fire.

• Heat — A source of ignition such as sparks, flames, or hot surfaces
• Fuel — Combustible material such as wood, paper, flammable liquids, or gases
• Oxygen — Present in the air at approximately 21%

Key Fact: Fire prevention focuses on keeping these three elements apart. On a construction site, this means controlling ignition sources, managing combustible materials, and ensuring good housekeeping.

How the Fire Triangle Applies to Electrical Work

Electrical faults create heat (the ignition source). Cable insulation, wood, dust, and other materials provide fuel. Oxygen is always present. This is why electrical faults are such a common cause of fire, and why correct installation standards exist.

Fire Extinguisher Types

All modern fire extinguishers have a red body with a coloured band indicating the type. Knowing which extinguisher to use on which fire is critical — using the wrong type can make a fire worse or endanger your life.

Extinguisher	Colour Band	Suitable For	NEVER Use On
Water	Red	Class A — solids (wood, paper, textiles)	Electrical fires, flammable liquids, metals
Foam (AFFF)	Cream	Class A and B — solids and flammable liquids	Electrical fires, cooking oils, metals
CO2	Black	Electrical fires and Class B — flammable liquids	Solids (Class A), cooking oils, confined use outdoors
Dry Powder	Blue	Class A, B, C and electrical fires	Enclosed spaces, cooking oils
Wet Chemical	Yellow	Class F — cooking oils and fats	Electrical fires, flammable liquids, metals

Key Points to Remember

Key Fact: CO2 extinguishers (black band) are the preferred choice for electrical fires. They leave no residue and do not conduct electricity.

Key Fact: Never use water on an electrical fire — water conducts electricity and creates a serious risk of electric shock.

Key Fact: Dry powder is the most versatile extinguisher but must not be used in enclosed spaces because it reduces visibility and creates breathing hazards.

Fire Classes Explained

Fire Class	Material	Example
Class A	Solids	Wood, paper, textiles, plastics
Class B	Flammable liquids	Petrol, oil, solvents
Class C	Flammable gases	Propane, butane, natural gas
Class D	Metals	Magnesium, aluminium, sodium
Class F	Cooking oils and fats	Deep fat fryers
Electrical	Electrical equipment	Distribution boards, motors

Emergency Evacuation Procedure

When the fire alarm sounds, you must follow the evacuation procedure without hesitation. Every second counts.

1. Stop work immediately — make safe any work in progress only if it can be done quickly and safely
2. Leave the building by the nearest safe exit route
3. Do not use lifts — always use the stairs
4. Do not stop to collect personal belongings
5. Go to the assembly point and report to your supervisor for a roll call
6. Do not re-enter the building until told it is safe by the fire marshal or emergency services

If You Discover a Fire

If you are the first person to discover a fire, follow this sequence:

1. Raise the alarm — activate the nearest fire alarm call point
2. Call 999 (or instruct someone to do so)
3. Evacuate — help others leave the area
4. Only fight the fire if it is small, you are trained, you have the correct extinguisher, and your escape route is clear

Key Fact: Your personal safety always comes first. If in any doubt, evacuate immediately and leave firefighting to the professionals.

Fire Prevention on Site

Proactive fire prevention is far more effective than reactive firefighting. Electricians have a particular responsibility because of the fire risks inherent in electrical work.

Good Practice

• Keep work areas clean and free from combustible waste and offcuts
• Store flammable materials in designated areas well away from ignition sources
• Do not overload circuits or use damaged extension leads
• Report fire safety concerns such as blocked exits, missing extinguishers, or faulty alarms
• Maintain clear access to fire exits and firefighting equipment at all times
• Ensure your installations do not compromise fire compartmentation or fire stopping

Emergency Action Plans

Every site must have an emergency action plan that covers fire, medical emergencies, chemical spills, structural collapse, and other foreseeable emergencies. You should familiarise yourself with this plan before starting work on any new site.

What You Should Know Before Starting Work

• The location of all fire alarm call points in your work area
• The locations of fire extinguishers and their types
• Your evacuation route and alternative routes
• The site assembly point and who to report to
• The procedure for calling emergency services
• The location of first aid facilities and who the trained first aiders are

Key Fact: The site induction should cover all emergency procedures. If it does not, or if you are unclear on any point, ask before you start work. Never assume the procedures are the same as the last site you worked on.

Hot Work

Hot work is any activity that produces sparks, flames, or heat that could start a fire. For electricians, this includes soldering, brazing, grinding, and using heat guns.

Hot Work Requirements

A hot work permit must be obtained before starting any hot work. The permit ensures that a proper risk assessment has been completed and appropriate precautions are in place.

A fire watch must be maintained during hot work and for at least 60 minutes after completion. The fire watch person must have a suitable fire extinguisher immediately available and know how to use it.

Key Fact: The 60-minute fire watch after hot work is a critical safety measure. Smouldering materials can reignite long after the work has finished.

Safety Considerations

• Know fire equipment locations — find the extinguishers, alarms, and exits in your work area before you start
• Learn site-specific procedures — every site has its own evacuation plan and assembly point
• Never block fire exits or obstruct access to firefighting equipment
• Report all fires and near misses — even a small fire that was quickly extinguished must be reported
• Protect fire compartmentation — your electrical installations must not breach fire barriers without proper fire stopping

Exam Tips

Exam Tip: The fire extinguisher colour code table is one of the most commonly tested areas. Memorise the colour bands and which fire classes each type covers.

Exam Tip: CO2 (black band) is the go-to answer for electrical fires. This comes up repeatedly.

Exam Tip: Know the fire triangle — heat, fuel, oxygen — and understand that removing any one element extinguishes the fire.

Exam Tip: Learn the evacuation procedure steps in order. Questions often present the steps scrambled and ask you to identify the correct sequence.

Exam Tip: Remember that hot work requires a permit and a fire watch for 60 minutes after completion. Both points are frequently tested.

Exam Tip: Know that dry powder extinguishers should not be used in enclosed spaces — this is a common distractor in multiple-choice questions.