Toolbox Talk

Recognizing Fire Hazards on Site

A fire starts when an ignition source meets a fuel source with oxygen around. On a job site both are everywhere, so the skill is seeing where they line up before they touch.

Walk your area and ask two questions: what here could start a fire, and what here would feed it? Where the answers sit close together, that's your hazard.

Ignition sources — what starts it

Anything that makes a spark, flame, or enough heat can be the ignition source:

Hot work — welding, cutting, grinding, brazing — throwing sparks and slag.
Electrical faults — damaged or overloaded cords, loose connections, arcing.
Temporary heaters and open flames.
Hot engine and exhaust surfaces on equipment and generators.
Friction, static electricity, and smoking outside designated areas.

Fuel sources — what feeds it

Then look at what would catch and carry the fire:

Combustible debris — scrap wood, cardboard, packaging, sawdust, rags.
Flammable and combustible liquids — gasoline, diesel, solvents, thinners, adhesives.
Flammable gases — propane, acetylene, and their leaking hoses.
Building materials — foam insulation, tarps, form lumber, plastics.
Fine dust from cutting wood or masonry, which can flash in the air.

The danger zones — where they overlap

The real hazard is where an ignition source sits next to fuel. Watch for hot work near flammable storage or debris, grinders near cardboard and sawdust, heaters near tarps and lumber, and battery charging or generators next to a trash pile.

Most of these are fixed by separation and housekeeping — move the fuel away, move the spark away, and clean up as you go. If you can't separate them, that task needs a permit, a fire watch, and an extinguisher standing by.

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