OSHA 30 Topic Tour - Construction

90 min read Training Guide

Topic-by-topic tour of the 30-Hour Construction card content: 29 CFR 1926, Focus Four, fall protection, scaffolding, silica, cranes, and a self-quiz.

Table of contents

OSHA 30 Topic Tour - Construction

The OSHA 30-Hour Construction card is the supervisor card. If the 10-hour is a door opener for a laborer, the 30-hour is a requirement line item for foremen, general foremen, superintendents, lead carpenters, lead electricians, safety officers, and a large share of contract roles on public works. It is also the credential most often written into a union apprenticeship agreement or a CM's subcontractor prequalification packet.

This guide is a topic tour. It assumes you already know what OSHA is (see the General Industry prep guide) and focuses on what is different about construction: the standards book, the Focus Four hazards, and the trades-specific subparts that separate a jobsite-ready supervisor from somebody who memorized 1910.

Why Construction Has Its Own Book

General Industry lives in 29 CFR 1910. Construction lives in 29 CFR 1926. The split happened because construction is:

  • Transient. The workforce, hazards, and even the employer change weekly.
  • Multi-employer. A single jobsite has the GC, half a dozen subs, and their subs, all working within arm's reach.
  • Outdoors and uncontrolled. Weather, traffic, terrain, and adjacent trades are part of the hazard picture.

1926 mirrors 1910 in structure but adds construction-specific requirements (excavations, scaffolds, cranes, steel erection, demolition). When 1926 is silent on a topic, 1910 sometimes fills the gap.

The Focus Four

OSHA data shows four hazards account for roughly 60 percent of construction fatalities year over year. Fiscal year statistics move a point or two, but the order is stable.


| Focus Four Hazard      | Approx. share of fatalities |
|------------------------|-----------------------------|
| Falls                  | ~38%                        |
| Struck-by              | ~9%                         |
| Electrocutions         | ~8%                         |
| Caught-in / between    | ~5%                         |

Every 30-hour course spends roughly four hours on these four topics combined. They are where inspectors start and where citations concentrate.

Fall Protection - 1926 Subpart M

The biggest killer on a jobsite. Core rules:

  • Fall protection required at 6 feet above a lower level in construction (vs. 4 ft in General Industry).
  • Steel erection has its own threshold (15 ft under 1926 Subpart R, though many employers voluntarily tighten to 6 ft).
  • Protection methods: guardrail system, safety net (under 30 ft of fall), or personal fall arrest system (PFAS).

Personal Fall Arrest System

Three components, every one of which has to be present and rated:

  • Anchor - minimum 5,000 lb static, or engineered system designed for 2x the maximum arresting force with a safety factor of at least two.
  • Body harness - full body only; body belts have not been allowed since 1998.
  • Connector - shock-absorbing lanyard, self-retracting lifeline, or rope grab on a vertical lifeline.

Free-fall distance limited to 6 ft. Max arresting force on the worker limited to 1,800 lb. Calculate total fall clearance: free fall + deceleration distance + harness stretch + worker height below D-ring + safety margin. A 6-ft lanyard with a 3.5-ft deceleration pack under a 6-ft worker off a D-ring at the shoulders wants a clear drop of roughly 18.5 ft before the lowest point of the fall. Anything less and the worker bottoms out.

Guardrails

  • Top rail 42 in +/- 3 in above the walking surface.
  • Top rail must withstand 200 lb in any outward or downward direction without dropping below 39 in.
  • Midrail halfway between top rail and walking surface; 150 lb capacity.
  • Toeboard 3.5 in minimum where tools or materials could be kicked off.

Covers and Holes

  • Covers for roof and floor openings rated for 2x the maximum intended load.
  • Marked "HOLE" or "COVER" or color-coded per site convention.
  • Secured against accidental displacement.

Struck-By and Caught-In / Between

The other two Focus Four hazards often run together. A struck-by happens when a flying, falling, swinging, or rolling object hits the worker. A caught-in happens when the worker is squeezed, pinned, or crushed between two things.

Typical causes and controls:

  • Flying particles from grinders, saws, nail guns - eye protection Z87+ and face shield, guards in place.
  • Falling objects from upper levels - toeboards, debris nets, hard hats Type I or Type II.
  • Swinging loads from cranes - tag lines, exclusion zones, no standing under the load path.
  • Rolling objects - wheel chocks, level staging, beware of pinched fingers during material handling.
  • Pinch points on equipment - guards, LOTO during service, competent-person inspection of rigging.
  • Trench collapse - see Excavations below.

Electrocution - 1926 Subpart K

  • GFCI protection required on all 120V 15A/20A receptacle outlets on a construction site. Not optional, not waivable. Assured equipment grounding conductor program is an alternative but rarely used.
  • Temporary power: cords rated for hard service (S, SJ, ST), no spliced cords, cords off ladders and out of water.
  • Overhead power line clearance: minimum 10 ft below 50 kV for equipment. Add 4 in for every 10 kV above 50 kV. Notify the utility if work will be closer.
  • Qualified vs. unqualified person rules identical to General Industry.

PPE - Construction Variants


| PPE       | Standard       | Construction notes                          |
|-----------|----------------|---------------------------------------------|
| Head      | ANSI Z89.1     | Type I (top) or Type II (top + side impact) |
| Eye       | ANSI Z87.1     | Z87+ for impact, shaded lens for cutting    |
| Foot      | ASTM F2413     | Protective toe; puncture-resistant plate    |
| Hearing   | ANSI S3.19     | 85 dBA action level                         |
| Hi-vis    | ANSI/ISEA 107  | Class 2 around vehicles/equipment           |

Class E hard hats (electrical) required anywhere energized work or overhead power is present.

Materials Handling, Cranes, and Rigging - Subparts H and CC

Cranes and Derricks - 1926 Subpart CC

Since the 2010 update, operators of most cranes on construction sites must be certified by an accredited body (NCCCO, NCCER, OECP). Additional requirements:

  • Certified signal person when the operator cannot see the load or the load-landing area.
  • Annual thorough inspection; monthly documented; shift pre-use inspection.
  • Ground conditions assessed and documented as adequate before setup.
  • Assembly/Disassembly Director for anything requiring boom assembly.
  • Exclusion zone around the swing radius to prevent caught-between fatalities.
  • Power line clearance same as construction equipment: 20 ft for lines up to 350 kV unless an engineered plan and spotter arrangement is in place.

Rigging

  • Competent person inspects slings before each shift.
  • Damaged, kinked, frayed, heat-damaged wire rope slings removed from service.
  • Tag lines on loads above ankle height or in any congested area.
  • Load chart checks every lift; no "eyeball" lifts on production work.

Powered Industrial Trucks

Forklift operators must be trained, evaluated, and certified every three years per 1910.178 (referenced on 1926 jobsites).

Excavations - Subpart P - 1926.650 through .652

The trenching subpart is on every 30-hour exam and has its own dedicated block.

  • Protection required at 5 feet of depth (except in stable rock).
  • Options: sloping, benching, shoring (hydraulic, pneumatic, timber), or trench box (shield).
  • Soil classification by a competent person before each shift: Stable Rock, Type A (most stable), Type B, Type C (least stable).
  • Sloping ratios for unsupported excavations:

| Soil Type   | Max slope (H:V) | Slope angle |
|-------------|-----------------|-------------|
| Stable Rock | Vertical        | 90 deg      |
| Type A      | 3/4 : 1         | ~53 deg     |
| Type B      | 1 : 1           | 45 deg      |
| Type C      | 1-1/2 : 1       | ~34 deg     |
  • Spoil pile kept at least 2 ft from the edge.
  • Ladder, ramp, or step-egress every 25 ft of lateral travel inside a trench 4 ft or deeper.
  • Daily competent-person inspection plus after every rainstorm, thaw, or vibration event.
  • Atmospheric testing required for trenches over 4 ft where a hazardous atmosphere could exist: oxygen 19.5 to 23.5 percent, LEL under 10 percent, toxics under PEL.

Stairways and Ladders - Subpart X

  • Ladder duty ratings: Type III 200 lb, Type II 225, Type I 250, Type IA 300, Type IAA 375.
  • Extension ladder 4-to-1 rule: base 1 ft out for every 4 ft of height.
  • Extension ladder must project at least 3 ft above the landing.
  • Never stand on the top two rungs of a stepladder or the top rung of an extension.
  • Ladders used for access only unless designed for work at height (platform, caged).

Scaffolding - Subpart L

  • Competent person required for scaffold erection, modification, dismantling, and daily inspection.
  • Capacity: 4x intended load (working load) plus rated minimums.
  • Fall protection at 10 ft on supported scaffold (different from the 6 ft general construction threshold).
  • Guardrails, midrails, and toeboards on all open sides.
  • Access within 24 in of any work platform via ladder, stair tower, or integrated ladder.

Silica - 1926.1153

Respirable crystalline silica is a regulated carcinogen.

  • PEL: 50 mcg/m3, 8-hour TWA.
  • Action level: 25 mcg/m3, triggers exposure assessment.
  • Table 1 task-based controls (wet methods, tool-integrated vacuum with HEPA, enclosed cabs) allow employers to skip air sampling if the listed controls are implemented and the task is on the list.
  • Medical surveillance required when an employee is required to wear a respirator under this standard for 30 or more days per year.
  • Written exposure control plan by a competent person.

Welding, Cutting, Brazing - Subpart J

  • Hot work permit system where required by the GC or by fire protection standards.
  • Fire watch for at least 30 minutes after hot work ends.
  • Flashback arrestors on fuel gas and oxygen lines.
  • Cylinders upright, capped when not in use, separated by 20 ft or a 5-ft firewall when stored.
  • Ventilation for galvanized, stainless, brass, and any coating that produces toxic fume (hexavalent chromium is a big one).

Concrete and Masonry - Subpart Q

  • Rebar caps on vertical bar that a worker could fall onto, full impalement protection (not plastic "mushroom" caps alone - UL rated troughs or engineered).
  • Formwork designed, erected, supported, and braced per plan; drawings on site for shoring.
  • Limited access zone for masonry walls under construction: on the unscaffolded side, marked, entry only by those laying the block.
  • Post-tensioning: no one in line with the strand end during tensioning.

Heat Illness

No federal heat standard as of this writing, but many state plans have one (California, Washington, Oregon, Minnesota) and a federal rulemaking is in progress.

  • Water, rest, shade - the three pillars.
  • Acclimatization for new or returning workers: 20 percent exposure day one, increase 20 percent per day.
  • High-heat procedures typically at 80 to 90 deg F heat index depending on state.
  • Emergency response plan posted and practiced.

Hazard Communication

Same GHS framework as General Industry: 16-section SDS, container labeling, pictograms, training in a language workers understand. Construction-specific chemicals to know: silica, lead in old paint, asbestos in older buildings, diesel exhaust, cement dust, isocyanates in spray foam, solvents.

The Role of a Foreman

The 30-hour places expectations on the supervisor.

  • Tool box talks - short daily or weekly safety meetings tied to the day's tasks. Document topic, attendees, sign-in.
  • Pre-task planning - identify hazards, controls, PPE before the crew starts.
  • Competent-person duties - excavations, scaffolds, fall protection, cranes, steel erection, silica, each has a competent-person role. A foreman often holds two or three of these.
  • Engaging the crew - ask workers to call hazards. Reward the call. Shut down tasks that are not right without making it a punishment.

Recordkeeping and Reporting

  • 300, 300A, 301 same as General Industry.
  • Severe-incident reporting: fatality within 8 hours, amputation/inpatient/eye loss within 24 hours.
  • Construction-specific forms include crane annual inspection reports, scaffold daily inspection tags, and excavation daily logs.

10-Question Self-Quiz

  1. Fall protection is required at what height in construction? 6 ft.
  2. Name the Focus Four. Falls, Struck-by, Electrocutions, Caught-in/between.
  3. Trench protection is required at what depth? 5 ft.
  4. Type C soil maximum slope ratio (H:V)? 1-1/2 : 1.
  5. What is the silica PEL? 50 micrograms per cubic meter, 8-hour TWA.
  6. Minimum anchor strength for a personal fall arrest system? 5,000 lb, or an engineered system with 2x safety factor.
  7. How long is the fire watch after hot work ends? 30 minutes.
  8. What is the minimum overhead power line clearance for equipment below 50 kV on a construction site? 10 ft.
  9. How often must an excavation be inspected by a competent person? At least daily and after any event that could change conditions.
  10. Fall protection threshold on supported scaffolds? 10 ft.

Day of the Course

  • Take notes on the Focus Four - those are the citations your crew will see.
  • Ask your trainer for real citation reports. OSHA posts them by industry at osha.gov/topic/enforcement.
  • The 30-hour is a time commitment. It is also the credential that moves you from laborer pay to lead pay on many jobs. Treat it like an investment.