Trade Safety
Trade Safety
Trade safety in the AITT mechatronics theory paper tests whether you can identify hazards around machines, panels and hand tools, rank controls in the correct order, and state the right emergency response. Questions mix definitions with short scenario reasoning, so always tie a rule to the hazard it removes.
Hazard control hierarchy
- Eliminate or substitute the hazard first, then engineering controls (guards, interlocks, RCCB), then administrative controls (permit to work, SOP, toolbox talk), and personal protective equipment last.
- Isolation follows lockout–tagout: identify every energy source (electrical, pneumatic, hydraulic, gravity, stored spring), isolate, lock and tag, release stored energy, then prove dead with a voltage tester that was proved on a known live source first.
- Safety sign colours: red = prohibition and fire equipment, yellow = warning, blue = mandatory, green = safe condition or escape route.
Electrical and fire response
Never touch a casualty still in contact with a live conductor. Switch off the supply first; if that is impossible, use dry insulating material to separate the person, then check response and breathing and start CPR at 30 compressions to 2 breaths if trained. For electrical fires use CO2 or dry powder - water conducts and can shock the operator at the nozzle. Always replace a fuse with the correct rating; thicker fuse wire defeats the protection and overheats the cable.
Worked example
A fitter finds a colleague collapsed beside an open 415 V distribution board. Reasoning: do not grab the casualty. Isolate the main switch, lock and tag, prove dead, raise the alarm and call the site first-aider, then begin CPR if the person is unresponsive and not breathing normally. Moving the person comes only after isolation. Pulling the casualty by the arm is the classic fatal error.
Traps that cost marks
Confusing mandatory (blue) with safe-condition (green) signs; claiming PPE is the first control; using water on an electrical fire; forgetting stored pneumatic or gravity energy in a lockout answer.