A–B. Health and Safety; Technological Development, Impacts, and Careers · Technology Fundamentals, Safety and Connections

Using Tools Safely: PPE, Safety Devices and a Safety Mindset

A4.3 A4.6About 75 minutes

Learning goals

I can choose and wear the right personal protective equipment for a task.
I can explain how common safety devices work and why they must never be bypassed.
I can follow basic safe practices for hand tools and power tools.
I can show a safety mindset and describe safety procedures in different technology areas.

Words to know

personal protective equipment (PPE)
Equipment worn to protect the body, such as safety glasses, earplugs, gloves and safety boots.

guard
A cover or barrier that keeps body parts away from blades, belts and other moving parts.

interlock
A device that stops a machine when a door or cover is opened.

operator-presence control
A control that stops a machine when the user lets go.

lockout/tagout
Locking off and tagging a machine's energy source so it cannot start during repairs.

near miss
An event where no one was hurt, but someone could have been.

safety mindset
Making safety a priority every time, by thinking ahead, asking and reporting.

decibel (dBA)
A unit for measuring how loud a sound is, adjusted to match human hearing.

Hook: the 2-second decision

Every year, people in Canada injure their eyes doing quick jobs at home: hammering a nail, trimming a branch, using a grinder "just for a second." Safety glasses take about two seconds to put on. Skilled tradespeople put them on every single time, not because they expect an accident, but because they have built a safety mindset.

This lesson is about using tools safely, choosing the right personal protective equipment (PPE), understanding safety devices, and making safety a habit.

Personal protective equipment (PPE)

PPE protects the person when other controls cannot remove all of the risk. It must be the right type, the right size, in good condition, and worn correctly.

Eyes and face: safety glasses with side protection; goggles for splashes and fine dust; a face shield over safety glasses for grinding. In Canada, look for CSA Z94.3 marked on safety eyewear. Regular eyeglasses are not safety glasses.
Hearing: foam earplugs or ear muffs. Ontario's workplace limit is an average of 85 decibels (dBA) over an 8-hour day. A simple test: if you have to raise your voice to talk to someone an arm's length away, the noise may be hazardous.
Hands: the right glove for the job: cut-resistant for sharp materials, nitrile for chemicals and in health care and salons, leather for rough work. Never wear gloves near rotating machine parts such as a drill press or lathe: a glove can be caught and pull your hand in.
Feet: safety boots. A green triangle CSA patch means a protective toe cap plus a puncture-resistant sole, which is required on most construction sites.
Head: a hard hat where objects could fall.
Lungs: dust masks or respirators. At work, respirators must be fit-tested.
Body: high-visibility vests near traffic, aprons, hair nets in food service. Tie back long hair, remove jewellery, and avoid loose sleeves.

Different jobs need different PPE. Read the task, then choose protection for every part of the body that is at risk.

Safety devices on tools and equipment

Engineers build safety into equipment. Never remove, bypass or tape over a safety device.

Guards cover blades, belts and gears.
Emergency stop buttons (large, usually mushroom-shaped) stop a machine instantly.
Interlocks stop a machine when a door or cover is opened. A microwave stops when you open its door.
Operator-presence controls stop the machine when you let go, like the bar you hold on a lawn mower or snowblower.
Push sticks keep fingers away from saw blades.
GFCI outlets cut the power in a fraction of a second if current leaks, for example through water. Bathrooms, kitchens and outdoor outlets usually have them.
Lockout/tagout: before repairing a machine, workers switch off and lock the energy source and attach a tag, so no one can turn it on while their hands are inside.

Using hand tools and power tools safely

Hand tools

Choose the right tool for the job (a screwdriver is not a pry bar or a chisel).
Inspect it first: no loose heads, cracked handles or dull blades. A dull blade needs more force and slips more easily.
Clamp small pieces; never hold them in your hand while cutting or drilling.
Cut away from your body, keep your other hand behind the cutting edge.
Carry sharp tools pointed down; store them in a rack or case.

Power tools (only with training and permission)

Read the manual and check the cord and plug for damage.
Unplug (or remove the battery) before changing blades or bits.
Keep both hands on the tool or away from the cutting area.
Let the tool stop completely before setting it down.
Keep the area clean: sawdust and offcuts are slip and fire hazards.

Safe cutting with a utility knife: the ruler guides the blade, fingers stay flat on the side of the ruler away from the blade, and the cut moves away from your body. Retract the blade as soon as you finish.

A safety mindset

A safety mindset means making safety a priority every time, not just when someone is watching. People with a safety mindset:

Stop and think before each task: What could go wrong? What do I need?
Ask when unsure. Skilled workers ask questions all the time.
Report near misses. A near miss is an event where nobody was hurt but someone could have been. Reporting it helps fix the problem before someone is hurt next time.
Keep the area clean ("housekeeping").
Never rush or take shortcuts, even near the end of a shift.
Follow industry-specific procedures. Each area has its own:

Area	Examples of industry-specific safety procedures
Construction	fall protection and Working at Heights training, hard hats and safety boots on site, locating buried cables before digging
Transportation	wheel chocks and jack stands (never work under a vehicle held up only by a jack), care with hot exhaust parts and battery acid
Hospitality and tourism	handwashing, keeping cold food at 4 °C or colder and hot food at 60 °C or hotter, allergen control, knife and fryer safety
Health care	hand hygiene, gloves and masks when needed, safe lifting and transfer of patients, sharps containers
Hairstyling and aesthetics	cleaning and disinfecting tools between clients, ventilation, following product labels, gloves for chemicals
Computer technology	shutting down and unplugging before opening a computer, anti-static wrist straps, never opening power supplies
Manufacturing	machine guarding, lockout/tagout, hearing protection
Green industries	chaps and face shield for chainsaws, sun and heat protection, safe pesticide handling

Every broad-based area adds its own procedures to the basic rules.

Worked example

Let's do a pre-task safety check

Jun will use a cordless drill to install a shelf bracket on a basement wall, with a parent present. Model a pre-task safety check.

Task: drill two pilot holes and drive two screws into a wall stud.
Hazards: flying dust and chips (eyes); drill bit catching and twisting the drill (wrist); hidden wires or pipes in the wall (electrical, water); standing on a step stool (fall).
Controls: use a stud finder and check where wires and pipes might run; keep holes away from outlets and switches. Use the right bit size. Set the drill's clutch to a lower setting. Stand on a sturdy step stool, never a chair.
PPE: safety glasses (CSA marked). No gloves needed for a hand drill, but tie back long hair and roll up sleeves.
Tool check: battery charged, bit tight in the chuck, drill switch works.
After the task: remove the battery, clean up dust, return tools to storage.

A pre-task check takes about two minutes and covers the task, hazards, controls, PPE, tool check and clean-up.

Just for fun

Why did the safety glasses get a standing ovation at the shop awards?

Because they always looked out for everyone.

Hands-on activity

PPE check and a supervised mini-job

You need: whatever PPE your home has (safety glasses, work gloves, ear muffs or foam earplugs), a simple screwdriver job chosen by a grown-up (for example, tightening loose cabinet handles or assembling a small flat-pack item). A grown-up must be present the whole time.

Inspect each piece of PPE: cracks, scratches, torn straps, worn gloves. Check safety glasses for a CSA Z94.3 marking. Record what you find.
Earplug practice (if you have foam plugs): with clean hands, roll the plug into a thin cylinder, reach over your head with the opposite hand to gently pull the top of your ear up and back, insert the plug and hold it for 20 seconds while it expands. Your own voice should sound muffled.
Write a pre-task check for the mini-job (task, hazards, controls, PPE, tool check, clean-up).
Do the job with your grown-up watching. Use the right size screwdriver tip.
Reflect: did anything surprise you? Was there a near miss? What would you do differently?

Your turn

Name the PPE that protects each: (a) eyes, (b) ears, (c) feet.

Why should you never wear gloves near a drill press?

What should you do before changing a blade on a power tool?

What is a near miss, and why should it be reported?

What does a GFCI outlet do?

Give two hand-tool safety rules.

More practice: warm-up

What does PPE stand for?

What marking should Canadian safety glasses have?

Should you remove a guard to make a cut easier?

What safety device stops a microwave when the door opens?

What should you do with long hair in a shop?

More practice: on your own

Explain why a face shield should be worn over safety glasses for grinding, not instead of them.

A worker tapes down the bar on a lawn mower so the engine keeps running when they let go. What safety device have they defeated and what could happen?

Why is lockout/tagout needed if a machine has an on/off switch?

Choose the right glove: (a) handling sheet metal, (b) applying hair colour, (c) using a drill press.

A busy restaurant cook says food safety rules slow them down. Explain why these industry-specific procedures matter.

Challenge

Write a full pre-task safety check for one of: changing a car tire, cutting hair with clippers, or cooking with a deep fryer.

Explain the difference between following safety rules and having a safety mindset. Why do employers want the second one?

Ontario's noise limit is 85 dBA averaged over 8 hours. Suggest controls for a worker who uses a loud saw for most of the day, using at least three levels of the hierarchy of controls.

Check your understanding

Quiz

Where should you not wear gloves?

What is the purpose of lockout/tagout?

Which safety device stops a lawn mower blade when you let go of the handle bar?

A green triangle patch on boots means...

Which action shows a safety mindset?

Before changing a drill bit, you should...

In food service, cold food should be kept at...

For parents and teachers

Your teen should not use power tools at home without direct adult supervision and instruction, and in school only after passing the teacher's safety test. The mini-job in the activity is deliberately simple: the goal is the routine (pre-task check, PPE, inspection, clean-up), not the job itself.

A common misconception is that gloves always make things safer; near rotating parts they are a serious hazard. Another is that regular eyeglasses are enough eye protection. If your household has safety glasses, check together for the CSA Z94.3 mark. Model the habit yourself: put on eye protection whenever you hammer, drill or trim.