How Heat Illness Progresses
The course walks through the warning signs from mild to life-threatening.
Early: rash and cramps
Heavy sweating, muscle cramps and heat rash. Rest, water and shade usually resolve them — if they're noticed.
Serious: heat exhaustion
Weakness, dizziness, nausea, headache and clammy skin. The worker must stop, cool down and be watched closely.
Emergency: heat stroke
Confusion, slurred speech, collapse or seizures. Call 911 and cool the person immediately — every minute counts.
Acclimatization, Step by Step
Many heat deaths happen in a worker's first days of hot work. A gradual ramp-up protects them.
Start light
New and returning workers begin with a reduced share of a full heat-exposed shift.
Increase gradually
Add exposure over about a week to two weeks while watching for symptoms.
Re-acclimatize
After time away, illness or a sudden heat wave, ramp up again.
Buddy check
Pair newer workers with experienced ones who know what to look for.
What Workers Learn
Recognize the progression from heat rash and cramps to exhaustion and heat stroke
Respond to heat emergencies — especially heat stroke — immediately and correctly
Apply water, rest and shade practices that prevent illness
Plan acclimatization schedules for new and returning workers
Heat on Crane Jobs and the Rules That Apply
Operators in older cabs without working air conditioning can bake through a long lift, and riggers on black steel or concrete deal with radiant heat on top of the weather. Fatigue and confusion from heat also slow reactions — a real problem when you're signaling a crane or guiding a load.
At the federal level, OSHA has addressed heat through the General Duty Clause, guidance and a National Emphasis Program, and has proposed a dedicated heat injury and illness standard; check OSHA's site for its current status. Several states, including California, Washington and Oregon, have their own heat rules. Employers should verify what applies where they work.
For the emergency side, pair this with our first aid overview.
Who Needs It
- Outdoor construction crews
- Riggers and ironworkers
- Crane operators in hot cabs
- Foundry and plant workers
- Supervisors who schedule summer work
- New and seasonal hires
Prevention is an employer program
This course gives workers knowledge. Employers provide water, shade and rest breaks, set acclimatization schedules, monitor conditions and comply with any state heat rule that applies.