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OSHA’s Focus Four — falls, struck-by incidents, electrocution, and caught-in or caught-between events — are the four construction hazards responsible for most jobsite fatalities. Foremen are critical because they verify controls in the field every shift, and the biggest mistake is treating the original safety plan as permanent when conditions change.
A carpenter steps backward on a second-floor deck to snap a line and finds the hole where the stairwell goes. Nobody covered it. Nobody marked it. That single missed step is how most construction fatalities actually happen — not dramatic failures, but ordinary work meeting an uncontrolled version of one of four hazards.
OSHA calls them the Focus Four: falls, struck-by incidents, electrocution, and caught-in or caught-between events. Together, these four account for the large majority of construction deaths year after year. Not silica. Not heat. These four.
Here’s the part that matters for you: the safety plan doesn’t stop anyone from getting hurt. Foremen are critical because you’re the one who turns that plan into real work — checking the guardrail before the crew steps on, stopping the crane when the spotter loses sight. This guide breaks down each hazard, what to verify on the ground, and the daily habits that keep your crew off the OSHA fatality report.
The Focus Four — falls, struck-by, electrocution, and caught-in or caught-between — are the four construction hazards responsible for most jobsite fatalities,…
Fall protection generally kicks in at 6 feet in construction, and a harness alone isn’t a system — anchor rating, clearance, swing-fall, and prompt rescue all…
Treat every overhead power line as energized until the utility confirms otherwise, and remember that switching off a machine doesn’t isolate every hazardous en…
A trench box protects workers inside the box only; it doesn’t prevent a cave-in, so keep workers, spoil piles, and equipment inside or well back from the prote…
A foreman can serve as the competent person only with the knowledge, experience, and actual authority to take prompt corrective action — the title alone doesn’…
The biggest foreman mistake is treating the morning’s safety plan as permanent; conditions change by the hour, and multi-employer policy plus supervisor-knowle…
OSHA Focus-Four Hazards: What Foremen Need to Know
A carpenter steps backward on a second-floor deck to snap a line and finds the hole where the stairwell goes. Nobody covered it. Nobody marked it. That is how most construction fatalities actually happen — not dramatic failures, but ordinary work meeting an uncontrolled version of one of four hazards. OSHA calls them the Focus Four. The safety plan doesn’t stop anyone from getting hurt — you do, by turning that plan into real work every shift.
Predictable Hazards Are Controllable Hazards
The Focus Four keep showing up in the same ways: roofers without tie-offs, laborers inside an equipment swing radius, apprentices carrying a 20-foot stick of conduit under a live overhead line. These aren’t exotic accidents — they’re repeats. Think of it like a pre-flight checklist: know the four ways workers die, and run a five-minute mental sweep of any work area before the crew starts.
The catch: for most jobsite incidents, conditions changed after the plan was written. The morning’s pre-task plan covered roofing work. By noon, a sub has dropped a scissor lift in the landing zone and someone removed a guardrail to land material. The plan is stale. The hazards are live. The biggest foreman mistake is treating the initial safety plan as permanent — effective foremen reassess throughout the shift, not just at the toolbox talk.
| Scenario | Hazard | Missed Control | Foreman Fix |
|---|---|---|---|
| Roofer sets hammer down at unprotected eave | Fall | ✗ No guardrail / tie-off at edge | ✓ Verify protection installed before work |
| Cement truck backs where laborer ties rebar | Struck-by | ✗ Worker in blind spot; ear protection masks alarm | ✓ Separation: routes, spotters, exclusion zones |
| Crane boom near untraced distribution line | Electrocution | ✗ Line never identified or de-energized | ✓ Identify lines; maintain required clearances |
| Pipe layer steps outside trench box “for two seconds” | Caught-in | ~ Box protects inside only — cave-in still possible | ✓ Keep workers, spoil piles & equipment clear of edges |
| Plywood cover lifted for ductwork, never re-secured | Fall | ✗ Hole is live again by afternoon | ✓ Covers re-secured and marked HOLE or COVER |
What to Check on the Ground
Verification means checking the details, not the vibe. A harness alone is not a fall-protection system. A spotter is not a substitute for a traffic-control plan. A trench box does not prevent a cave-in.
Falls
Construction’s leading fatal hazard — from roofs, scaffolds, ladders, lifts, floor openings, and unprotected edges.
- Guardrails, secured covers marked HOLE or COVER, and task-appropriate fall-arrest systems in place before work starts
- Anchors rated 5,000 lb per worker; connector compatibility, clearance, and swing-fall exposure checked
- Harnesses and connectors inspected before each use; ladders matched to task — access ladders extend 3 ft above landing
- Rescue plan before anyone ties off — suspension trauma can kill in minutes
Struck-By
Vehicles, heavy equipment, falling objects, flying debris, or materials that swing, roll, or shift — usually a worker the operator couldn’t see.
- Barricades and exclusion zones around cranes, lifts, demolition, and overhead work
- Vehicle and pedestrian routes, blind-spot management, and backing procedures
- Toe boards, tool tethering, canopies; load securement and material stacking
- High-visibility clothing, lighting, alarms, cameras — and stop-work if operator–spotter contact is lost
Electrocution
Overhead power lines, damaged temporary wiring, missing grounding, energized equipment, and unexpected startup.
- Identify power lines before cranes, lifts, scaffolds, ladders, or long materials move nearby — treat every line as energized until the utility confirms otherwise
- GFCIs or an assured equipment-grounding program in use
- Cords, tools, panels, and temporary power inspected; damaged gear removed immediately
- Lockout/tagout followed — switching off a machine doesn’t isolate every energy source
Caught-In & Caught-Between
Trench collapses, machinery entanglement, crushing between equipment and structures, shifting materials.
- Excavations inspected by a competent person as required; protective systems matched to soil and site conditions
- A trench box protects workers inside the box only — keep spoil piles and equipment well back from edges
- Safe access and egress; machine guards installed and functional
- Equipment blocked before maintenance; workers clear of swing radiuses, pinch points, and suspended loads
Six Habits That Keep Your Crew Off the Fatality Report
Know the four. The Focus Four drive most construction fatalities — not silica, not heat. Sweep every work area for these four before the crew starts.
Fall protection at 6 ft. A harness alone isn’t a system — anchor rating, clearance, swing-fall, and prompt rescue all have to check out.
Treat lines as live. Every overhead power line is energized until the utility confirms otherwise; lockout/tagout covers what the off-switch doesn’t.
Respect the trench box limits. It protects workers inside the box; it doesn’t prevent a cave-in. Spoil piles and equipment stay back from the edge.
Competent means authorized. A foreman serves as competent person only with the knowledge, experience, and actual authority to take prompt corrective action — the title alone doesn’t qualify.
Reassess all shift. The biggest mistake is treating the morning’s plan as permanent. Conditions change by the hour — multi-employer policy and supervisor knowledge both apply.
From Plan to Protected Crew
Pre-Task Plan
Write the plan for the work and the four hazards it could unleash.
Verify Controls
Guardrails installed, covers marked, anchors rated, lines identified.
Toolbox Talk
Brief the crew; confirm harness inspection and spotter signals.
Reassess by the Hour
Scissor lift in the landing zone? Guardrail removed? Plan is stale — update it.
Stop When Unsafe
You have the authority. Stopping the crane when the spotter loses sight is the job.
A trench box protects workers inside the box; it does not prevent a cave-in — workers must stay within its protected area, and spoil piles and equipment must be kept back from the excavation edge.
Why the Focus Four Get Their Own Category (And Why It’s Not Just OSHA Bureaucracy)
OSHA groups falls, struck-by, electrocution, and caught-in hazards together because these four are the construction hazards responsible for most jobsite fatalities — and because they keep showing up in the same predictable ways. Roofers without tie-offs. Laborers standing inside an equipment swing radius. Apprentices carrying a 20-foot stick of conduit under a live overhead line. These aren’t exotic accidents. They’re repeats.
Picture the pattern in real life: a roofer sets his hammer down at the edge of an unprotected eave. A cement truck backs across an access road where a laborer is tying rebar. A crane boom swings within feet of a distribution line nobody traced. A pipe layer steps outside the trench box for two seconds. Four different trades, four different moments — the same four hazards every time.
That’s actually good news for a foreman. Predictable hazards are controllable hazards. Think of it like a pre-flight checklist: pilots don’t inspect for every possible failure, they check the handful that actually bring planes down. If you know the four ways workers die, you can run a five-minute mental sweep of any work area before the crew starts.
Here’s the catch — and it’s the one that trips up most crews. For most jobsite incidents, the conditions changed after the plan was written. The morning’s pre-task plan covered roofing work. By noon, a sub has dropped a scissor lift in the landing zone and someone removed a guardrail to land material. The plan is stale. The hazards are live. It’s like planning a route on a map, then finding the bridge is out halfway there — the map didn’t change, the road did.
The biggest mistake foremen make, according to ForemanBrief’s analysis of field practices, is treating the initial safety plan as permanent. Construction sites change by the hour. Effective foremen reassess throughout the shift — not just at the toolbox talk.
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Falls: The Hazard That Kills More Construction Workers Than Anything Else
Falls are construction’s leading fatal hazard — from roofs, scaffolds, ladders, lifts, floor openings, and unprotected edges. The rule most foremen work under: OSHA generally requires fall protection at 6 feet or more in construction, though specific activities have different thresholds. Six feet doesn’t sound like much. It’s a fall from a standard stepladder onto concrete, and it kills people every year.
Before any elevated work starts, verify the protection is actually installed — not promised, not “coming after lunch.” Installed. That means guardrails on open edges, secured and clearly marked covers on floor and roof openings, and personal fall-arrest systems that fit the task.
Here’s where foremen get burned: a harness alone is not a fall-protection system. The anchor has to hold 5,000 pounds per attached worker (or be designed by a qualified person with a safety factor of two). The connector has to be compatible. There has to be enough clearance below so a fallen worker doesn’t hit the ground before the system arrests the fall. Swing-fall exposure matters. And if someone does fall and ends up suspended, prompt rescue matters — suspension trauma can kill in minutes.
Real-world example: a worker clips a lifeline to a scaffold tube that was never designed as an anchor point. He falls, the tube bends, the anchor fails. Every piece looked right from ten feet away. Verification means checking the details, not the vibe.
Another common scenario: a plywood cover on a floor opening gets lifted to run a duct through it in the morning — and by afternoon, nobody has re-secured or re-marked it. The guy carrying drywall in the afternoon is walking the same deck the carpenter walked safely at 7 a.m., except now the hole is live again. Covers are controls only while they stay in place.
- Confirm anchor points are rated and identified
- Check that opening covers are secured and marked HOLE or COVER
- Verify workers inspect harnesses and connectors before each use
- Match ladders to the task — access ladders must extend at least 3 feet above the landing
- Have a rescue plan before anyone ties off, not after someone falls
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Struck-By: The Hazard Hiding in Every Blind Spot and Backing Truck
Struck-by incidents kill workers hit by vehicles, heavy equipment, falling objects, flying debris, or materials that swing, roll, or shift. For most jobsite struck-by deaths, the story is the same: a worker in a place the operator couldn’t see, or a load that wasn’t controlled overhead. Dump trucks backing up. A wrench dropped from a scaffold platform. A suspended load swinging in the wind.
Consider how quickly it happens: a dump truck driver has checked his mirrors twice and started backing. In the three seconds between his second glance and full reverse, a laborer steps behind the truck to grab a hose. The backup alarm is working fine — the laborer is wearing ear protection and never hears it. That entire incident takes less time than reading this paragraph.
Your job as foreman is to control separation — keeping people out of the path of energy. Think of it like a goalie’s crease or a blast zone: there’s an area around every hazard where people simply don’t belong. That means barricades and exclusion zones around cranes, lifts, demolition, and overhead work. It means toe boards, tool tethering, and canopies where workers pass beneath active work. It means high-visibility clothing and real lighting, not a single stringer bulb.
A common and dangerous shortcut: using a spotter as a substitute for a traffic-control plan. A spotter is one control, not the whole system. The operator and spotter need an agreed communication method — hand signals or radio — and the operation stops the moment visual or verbal contact is lost. No exceptions, no “I could still kind of see him.”
Don’t forget face and eye protection for grinding, cutting, and chipping. A fragmented grinding wheel at 8,000 RPM doesn’t care that the task “only takes a second.” Check equipment alarms, cameras, and mirrors daily — a dead backup alarm on a loader in a pedestrian zone is a citation waiting to happen, and worse.
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Electrocution: Where the Dangerous Part Isn’t Always the Wire You See
Electrical fatalities on construction sites most often involve overhead power lines, damaged temporary wiring, missing ground-fault protection, energized equipment, and unexpected machine startup. The wire you see is usually handled fine. The one that kills is the 13,800-volt distribution line nobody traced before the crane boom swung near it.
Here’s a scenario that plays out on real sites every year: a crane is setting HVAC units on a rooftop. The operator can see a line of poles about 60 feet away and assumes the lines are phone or cable. They’re primary distribution. Electricity can arc across an air gap — the boom never has to touch the line. Two workers die making that one assumption.
Rule one: identify power lines before cranes, lifts, scaffolds, ladders, or long material move anywhere near them. Maintain required clearances unless the utility has de-energized and properly controlled the line — and treat every overhead line as energized until the utility owner confirms otherwise in writing or through lockout. It looks like it could be phone line. It might not be.
On the temporary-power side, verify GFCIs are in use or an assured equipment-grounding program is in place. Inspect extension cords, tools, panels, and temp power regularly — and remove damaged equipment from service immediately, not at the end of the shift. That cord with the missing ground prong and the tape-wrapped jacket goes in the trash, not back in the gang box.
Two traps that catch even experienced crews: First, turning off a machine does not isolate every hazardous energy source. Hydraulic pressure, stored mechanical energy, capacitors — lockout/tagout exists for a reason. The classic example: a maintenance worker shuts down a conveyor to clear a jam, reaches into the tail pulley, and residual stored energy or a timer cycle restarts the belt with his arm inside it. Second, only properly authorized workers perform electrical work. A laborer who “knows a little about wiring” is not authorized, and if something happens, that distinction lands on your supervision.
If your project involves significant electrical work, a licensed electrician and proper permits aren’t optional formalities — they’re the system working as designed.
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Caught-In or Caught-Between: Trenches, Pinch Points, and the Crush Zone
Caught-in and caught-between incidents include trench collapses, machinery entanglement, crushing between equipment and structures, and workers caught beneath shifting material. This is the category where soil weight surprises people: a single cubic yard of soil weighs roughly as much as a small car — about 3,000 pounds. Picture a compact sedan dropped on a worker’s chest. That’s what a trench wall failure delivers. A worker buried to the waist can’t breathe — the chest compression does the damage.
Excavations require inspection by a competent person as required by the standard, and a protective system — sloping, benching, shoring, or shielding — matched to actual soil and site conditions. Spoil piles, equipment, and materials stay back from the edge. Safe access and egress mean a ladder within 25 feet of any worker in a trench 4 feet or deeper.
A trench box protects workers inside the box; it does not prevent a cave-in. Workers must remain within its protected area — and the box moves with the work.
That blockquote is one of the most misunderstood facts in excavation work. A crew that steps outside the box “for just a minute” to grab a shovel is standing in unprotected soil that the box has already disturbed. And it’s not just collapses: a worker who steps outside the box while an excavator swings a bucket overhead has left his only protection behind.
Beyond trenches: machine guards stay installed and functional. Equipment gets blocked or supported before maintenance — a raised dump bed held only by hydraulics has killed mechanics who crawled under it. Imagine the scene: the mechanic props nothing under a loaded bed because “it’ll only take a minute,” a hydraulic line fails, and 10,000 pounds of debris come down on him. Workers stay out of swing radiuses, pinch points, and suspended-load zones. And operators maintain clearance from fixed objects when equipment moves. The guy pinned between an excavator counterweight and a column never planned to be there — he just ended up in the crush zone.
Competent Person vs. Qualified Person: The Difference That Decides Who Can Sign Off
A competent person is someone who can identify existing and predictable hazards and has authority to correct them promptly. A qualified person has recognized knowledge, training, certification, or experience sufficient to design or solve technical problems. The terms are not interchangeable, and confusing them gets employers cited.
Think of it this way: the competent person looks at a trench and says “that wall’s cracking, everybody out” — and has the authority to pull the crew. The qualified person designs the shoring system that lets them go back in safely. One role catches problems. The other engineers solutions. For example, when an engineer specifies a trench shield rated for a 15-foot excavation in Type B soil, that’s a qualified person at work. When the foreman on site notices water pooling at the bottom of that same trench overnight and pulls the crew out until it’s re-inspected, that’s the competent person doing their job.
Can a foreman be the competent person? Yes — if the foreman has the required knowledge and experience and formal authority to take prompt corrective action. A job title alone doesn’t establish competence. If you’re the excavation competent person but you can’t actually stop work without calling the superintendent first, you’re not the competent person in OSHA’s eyes.
Also note: a worker may be competent for one activity and not another. Your best scaffold hand might know scaffolds cold but have no business inspecting a 12-foot-deep trench. Employers should formally identify who holds which responsibilities, in writing, before the work starts.
| Competent Person | Qualified Person | |
|---|---|---|
| Core ability | Identify hazards, correct them promptly | Design solutions to technical problems |
| Authority | Must have authority to take corrective action | Recognized degree, certificate, or extensive experience |
| Typical role | Inspects trenches, scaffolds, fall-protection systems | Designs shoring, anchorage systems, protective systems |
| Scope | Task-specific — competent for one activity, not all | Problem-specific — qualified for a defined technical area |
Your Daily Routine: The Questions That Catch Hazards Before They Catch Your Crew
What foremen need isn’t more paperwork — it’s a repeatable field habit. Foremen are critical because safety only works at the point of work, and that’s where you stand. Run this sweep before the shift and again whenever conditions change.
- What can workers fall from or into? Edges, openings, scaffolds, ladders, lifts.
- What can strike a worker? Vehicles, swinging loads, dropped tools, flying debris.
- What electrical energy could workers contact? Overhead lines, temp power, damaged cords, stored energy.
- Where could someone be crushed, pinned, buried, or pulled in? Trenches, pinch points, equipment swing radiuses, suspended loads.
- Have conditions changed since the plan was written? Weather, sequencing, new subs, removed controls.
- Are controls installed and functioning? Not planned — installed.
- Do workers actually understand the plan? Ask them to explain it back — in a language they understand.
- Are subcontractor activities creating new hazards? Overlapping operations are the classic gap.
- Is a competent person required — and present?
- Can emergency services reach the work area?
- Does the crew know when and how to stop work?
Two compliance facts worth memorizing. First, employers must provide required training in a language and vocabulary workers can understand — a toolbox talk in English delivered to a Spanish-speaking crew is a citation and a moral failure. Second, under OSHA’s multi-employer worksite policy, more than one employer can be cited depending on who created, controlled, corrected, or exposed workers to a hazard. And a supervisor’s knowledge of an unsafe condition can be attributed to the employer — so when you see it, you own it. Correct it or escalate it, immediately.
One more habit: document near misses. A dropped wrench that hits nobody is a free lesson about your toe boards. Use it to fix the system, not to hammer the worker.
Frequently Asked Questions
Why are they called the “Focus Four”?
OSHA groups falls, struck-by incidents, electrocution, and caught-in or caught-between events together because they account for a large share of construction fatalities. They’re recurring priorities in training, inspections, and enforcement, which is why they get focused attention rather than being buried in a longer hazard list.Is Focus Four training mandatory?
Employers must train workers to recognize and avoid job hazards under applicable OSHA standards, but the exact course format depends on the work, the standards involved, the employer’s program, and contract requirements. An OSHA 10- or 30-hour card shows outreach course completion — it does not replace task-specific training.Can a foreman be the competent person?
Yes, if the foreman has the required knowledge and experience for that specific activity and has actual authority to take prompt corrective action. A job title alone doesn’t establish competence — and a foreman who must get approval before stopping work doesn’t meet the definition.Who is responsible for a hazard on a multi-employer site?
Potentially more than one employer. Under OSHA’s multi-employer worksite policy, citations can go to whichever employer created the hazard, exposed workers to it, controlled the worksite, or was responsible for correcting it. Foremen should correct what they can and escalate what they can’t, since a supervisor’s knowledge of an unsafe condition can be attributed to the employer.When should a foreman stop work?
Stop work when workers face an uncontrolled serious hazard, when required safeguards are missing, when conditions differ materially from the plan, or when the crew cannot perform the task safely. A clear, non-retaliatory stop-work process protects everyone — workers may also have legal protections when raising safety concerns.Are heat and silica part of the Focus Four?
No. Heat and silica are serious construction hazards, but they aren’t among the four Focus Four categories. They still require assessment and controls — and they can worsen Focus Four risks through fatigue, reduced visibility, or impaired concentration, which is why many foremen fold them into the same daily sweep.Does PPE satisfy OSHA requirements on its own?
Usually not. PPE must be suitable, maintained, fitted, and supported by training, but many standards also require engineering controls, guarding, protective systems, safe clearances, or specific procedures. PPE is the last line of defense — elimination, substitution, engineering controls, and administrative controls come first.Conclusion
If you remember one thing: identify what can cause a fall, impact, electrical contact, or crushing event — then eliminate or control that exposure before the crew starts. Not after. Not during. Before. Every other part of this job — the paperwork, the toolbox talks, the inspection forms — exists to support that single habit.
The Focus Four don’t kill people through bad luck. They kill through small gaps: an uncovered hole, a dead backup alarm, an unrated anchor, a spoil pile too close to the edge. You’re the last set of eyes before those gaps meet your crew. Walk the area. Ask the four questions. And when the answer is wrong, stop the work — that’s not overstepping, that’s the job.
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