OSHA Book Guide for Contractors: 29 CFR 1926 and the NASCLA Exam
The 29 CFR Part 1926 OSHA Standards and Regulations book — what most candidates simply call the “OSHA book” — is one of the approved references you carry into the NASCLA Accredited Examination for Commercial General Building Contractors. It is also the rulebook a compliance officer measures your jobsite against every day after you are licensed.
This guide covers what is actually inside 29 CFR 1926, how the book is organized, where OSHA content shows up on the exam, the thresholds worth knowing cold, and how to tab the book so you can find any answer in well under a minute.
Key Takeaways
- The “OSHA book” is 29 CFR Part 1926 — OSHA’s safety and health standards written specifically for construction work.
- There is no standalone OSHA section on the NASCLA exam; safety questions surface inside General Requirements, Site Construction, and the trade areas.
- Learn the subpart letters (C through CC) rather than page numbers — that is what makes an open-book lookup fast.
- Permanent tabs and highlighting are allowed before exam day; handwritten notes are not, so prepare your books early.
- Editions and requirements change — confirm the current approved reference list in the PSI candidate bulletin before you buy or test.
What the “OSHA book” actually is
The OSHA book is Title 29, Part 1926 of the Code of Federal Regulations — officially, Safety and Health Regulations for Construction . It is published by the Occupational Safety and Health Administration and it sets the minimum safety requirements for employers doing construction work: alteration, repair, painting, decorating, and new building alike. Vendors usually sell it as “29 CFR 1926 OSHA Standards and Regulations for the Construction Industry.”
Everything in the book traces back to the Occupational Safety and Health Act of 1970, which also carries the General Duty Clause — the requirement that employers keep the workplace free of recognized hazards even when no specific standard covers them.
Who the standards apply to
Part 1926 places the duty on the employer . General contractors, subcontractors, and controlling employers can all be cited on the same site, which is why multi-employer jobsites are a recurring compliance topic. The book also defines the competent person — someone capable of identifying hazards and authorized to correct them — a role that appears in excavations, scaffolds, fall protection, and demolition.
How 29 CFR 1926 is organized
Part 1926 is divided into lettered subparts , each covering one hazard family, with numbered sections inside them (1926.501, for example, sits in Subpart M). Learning the letters is the single fastest way to speed up lookups, because almost every exam question maps to a subpart before it maps to a page.
| Subpart | What it covers | Why contractors reference it |
|---|---|---|
| C | General safety and health provisions | Accident prevention programs, training, competent person duties |
| D | Occupational health and environmental controls | Noise, silica, lead, asbestos, sanitation, first aid |
| E | Personal protective and life-saving equipment | Head, eye, face, hearing, and respiratory protection |
| F | Fire protection and prevention | Extinguisher placement, flammable liquid storage |
| H | Materials handling, storage, use, and disposal | Rigging, storage clearances, debris chutes |
| I | Tools — hand and power | Guarding, powder-actuated tools, abrasive wheels |
| J | Welding and cutting | Hot work, cylinder handling and storage |
| K | Electrical | Wiring design, GFCI, assured equipment grounding |
| L | Scaffolds | Capacity, access, erection, and scaffold fall protection |
| M | Fall protection | The six-foot trigger, guardrails, personal fall arrest |
| P | Excavations | Sloping, shoring, egress, daily competent-person inspection |
| Q | Concrete and masonry construction | Formwork, shoring, rebar impalement protection |
| R | Steel erection | Connector rules and the fifteen-foot trigger |
| T | Demolition | Engineering survey before work begins |
| X | Stairways and ladders | The nineteen-inch break rule and ladder extension |
| Z | Toxic and hazardous substances | Permissible exposure limits, silica, lead, asbestos |
| AA | Confined spaces in construction | Permit-required entry and rescue provisions |
| CC | Cranes and derricks in construction | Operator qualification, power line clearance, assembly |
29 CFR 1926 vs. 29 CFR 1910: which standard applies
Contractors run into both books, and mixing them up is one of the most reliable ways to lose points. Part 1926 governs construction work. Part 1910 governs general industry — manufacturing, warehousing, and fixed workplaces. Where 1926 is silent, it sometimes incorporates a 1910 standard by reference, but the construction rule always controls construction work.
| 29 CFR 1926 — Construction | 29 CFR 1910 — General Industry | |
|---|---|---|
| Who it covers | Construction, alteration, repair, painting, decorating | Manufacturing, warehousing, most fixed workplaces |
| Fall protection trigger | Generally 6 ft, with trade-specific exceptions | Generally 4 ft |
| Scaffolds | Subpart L, written for temporary structures | Walking-working surfaces rules |
| Excavations | Subpart P, a full hazard family | No dedicated construction excavation subpart |
| Relationship | Incorporates some 1910 standards by reference | Applies when construction work is not involved |
| On the NASCLA exam | The approved construction reference | Not the construction reference |
How the OSHA book is tested on the NASCLA exam
The OSHA book is one of roughly two dozen approved references for the NASCLA Accredited Examination for Commercial General Building Contractors. The exam is open-book, computer-delivered at PSI test centers, and built around 115 scored questions with a 330-minute limit; candidates generally need 81 correct answers to pass. Always confirm the current specifications and reference list in the NASCLA Commercial Exam page and its linked candidate information bulletin before you register.
Where OSHA questions actually live
There is no line item called “OSHA” in the published content outline. Safety content is distributed across the subject areas — heaviest in General Requirements and Site Construction, with more appearing anywhere a trade has its own OSHA subpart.
| Subject area | Scored items | Typical OSHA overlap |
|---|---|---|
| General Requirements | 25 | Heavy — safety programs, PPE, training, housekeeping |
| Site Construction | 15 | Heavy — excavations, trenching, equipment, site access |
| Concrete | 6 | Moderate — formwork, shoring, rebar caps |
| Masonry | 4 | Moderate — limited access zones, wall bracing |
| Metals | 6 | Moderate — steel erection, welding and cutting |
| Wood | 5 | Light — tool guarding, material handling |
| Thermal and Moisture Protection | 5 | Light — roofing fall protection |
| Doors, Windows, and Glazing | 4 | Light — material handling |
| Finishes | 5 | Light — respiratory protection, ventilation |
| Mechanical and Plumbing Systems | 6 | Light — confined spaces, hot work |
| Electrical Systems | 3 | Moderate — temporary power, GFCI, lockout |
| Procurement and Contracting Requirements | 31 | Light — safety responsibilities in contracts |
Because safety questions are scattered rather than blocked, you cannot skip OSHA and make up the points elsewhere. A trench-depth question in Site Construction and a rebar-cap question in Concrete both come out of the same book. Our NASCLA exam prep course maps this overlap reference by reference.
Know the books before exam day
Our NASCLA prep course walks you through every approved reference, including where OSHA content is most likely to be tested.
OSHA numbers worth knowing cold
You do not need to memorize Part 1926. You do need enough recall to recognize when an answer choice is obviously wrong and to know which subpart to open. These are the thresholds that come up most often on construction sites and in exam questions.
| Requirement | Threshold | Where to look |
|---|---|---|
| Fall protection, most construction work | 6 feet above a lower level | 1926.501 (Subpart M) |
| Fall protection on scaffolds | 10 feet above a lower level | 1926.451(g) (Subpart L) |
| Fall protection in steel erection | 15 feet, with separate connector rules | Subpart R |
| Guardrail top rail height | 42 inches, plus or minus 3 inches | 1926.502(b) |
| Excavation protective system required | 5 feet deep or more, unless in stable rock | 1926.652 |
| Excavation designed by a registered professional engineer | Deeper than 20 feet | 1926.652(b) |
| Trench means of egress | Within 25 feet of lateral travel, trenches 4 feet or deeper | 1926.651(c)(2) |
| Spoil pile setback from the excavation edge | At least 2 feet | 1926.651(j)(2) |
| Stairway or ladder required at a break in elevation | 19 inches or more | 1926.1052 (Subpart X) |
| Portable ladder extension above the landing | 3 feet | 1926.1053(b)(1) |
| Respirable crystalline silica permissible exposure limit | 50 µg/m³ as an 8-hour TWA | 1926.1153 |
| Report a work-related fatality to OSHA | Within 8 hours | 1904.39 |
| Report an in-patient hospitalization, amputation, or loss of an eye | Within 24 hours | 1904.39 |
How to tab and highlight your OSHA book
NASCLA references may be highlighted, underlined, and fitted with permanent index tabs. They may not contain handwritten notes, loose paper, or added content. That rule is why preparation has to happen weeks before your test date — you cannot fix a poorly organized book in the testing room.
OSHA book preparation checklist
- Confirm the exact edition listed in the current PSI candidate information bulletin before you buy
- Tab every subpart letter from C through CC along the outside edge, in order
- Add second-tier tabs for the high-frequency topics: fall protection, excavations, scaffolds, electrical, PPE
- Highlight the numbers — heights, depths, distances, exposure limits, and reporting times
- Tab the table of contents and the index; most successful lookups start at the index
- Run twenty timed practice lookups and keep working until each one lands under thirty seconds
- Inspect the book: no tab covering text, no handwritten notes, no loose paper inserted
If you would rather not build a tab system from scratch, pre-printed NASCLA exam book tabs place the tabs at the sections most likely to be tested, and our NASCLA reference book list shows which titles you still need.
An open-book lookup strategy that holds up under the clock
With 330 minutes for 115 questions, you have just under three minutes per question on average — and some questions need almost none. Protect that margin with a repeatable routine instead of improvising under pressure.
The three-step lookup
- Find the trigger word. Height, depth, distance, “who is responsible,” or an equipment name. That word decides the subpart.
- Go to the subpart, then the index. Open the tab first; use the index only to narrow within it.
- Read the paragraph, not the standard. Confirm the number, mark your answer, move on. Rereading the full section is how candidates lose ten minutes at a time.
Build the habit with timed repetition. A full-length NASCLA practice test and open-book exam is the cheapest way to find out whether your tab system actually works before it counts.
Compliance, inspections, and penalties
Once you are licensed, Part 1926 stops being exam material and becomes the standard your business is measured against. OSHA compliance officers conduct jobsite inspections, and the agency prioritizes them roughly in this order: imminent danger, fatalities and catastrophes, worker complaints and referrals, programmed inspections in high-hazard industries, and follow-ups on prior citations.
What a citation can cost
Citations are classified as other-than-serious, serious, willful, repeat, or failure to abate. Maximum penalty amounts are adjusted annually for inflation , so check OSHA’s current figures rather than relying on a number you read once. Beyond the fine, a citation history affects your experience modification rate, your insurance, and your eligibility to bid certain work.
What employers owe workers
- Hazard training in a language and vocabulary workers understand
- Required personal protective equipment, generally at no cost to the employee
- Injury and illness recordkeeping on the OSHA 300 log, 300A summary, and 301 incident report
- Competent-person inspections wherever the standard requires them
- Freedom from retaliation for reporting a hazard or requesting an inspection
Staying current with 29 CFR 1926 updates
OSHA revises Part 1926 as technology, hazards, and evidence change. Recent examples include the confined spaces in construction standard, the respirable crystalline silica rule, and updated crane operator qualification requirements. Printed editions lag the Federal Register, so the book in your hand may not match the live text.
For day-to-day compliance, read the current text on the eCFR version of Part 1926 or OSHA’s construction standards index . For the exam, study the specific edition listed in your candidate bulletin.
Why safety pays after you pass
Experienced superintendents tend to describe three things as one thing: safety, schedule, and cleanliness. A clean site is usually a safe site, and a safe site is usually the one hitting its dates — because incidents break sequence, stop work, and pull your best people into paperwork instead of production. The OSHA book is where that discipline is written down.
Understanding Part 1926 protects your crew, your margin, and your license. That is the same reason it earns a place on the NASCLA exam.
Frequently Asked Questions
What is the OSHA book used on the NASCLA exam?
It is 29 CFR Part 1926, “Safety and Health Regulations for Construction” — the section of the Code of Federal Regulations that sets minimum safety requirements for construction employers. It is one of the approved open-book references for the NASCLA Accredited Examination for Commercial General Building Contractors.
Is 29 CFR 1926 the same as 29 CFR 1910?
No. Part 1926 covers construction work; Part 1910 covers general industry. Part 1926 incorporates a few 1910 standards by reference, but for construction questions the 1926 requirement controls. The fall protection trigger is the most commonly confused difference.
How many OSHA questions are on the NASCLA exam?
The published content outline does not list OSHA as its own subject area. Safety content is distributed across the exam, with the heaviest concentration in General Requirements and Site Construction, and additional questions wherever a trade has its own OSHA subpart.
Can I tab and highlight my OSHA book before the exam?
Yes. Approved references may be highlighted, underlined, and fitted with permanent index tabs. Handwritten notes, loose paper, and added content are not permitted. Confirm the current rules in your candidate information bulletin, because policies can change.
Which OSHA subparts should I tab first?
Start with C (general provisions), D (health controls), E (personal protective equipment), K (electrical), L (scaffolds), M (fall protection), P (excavations), and X (stairways and ladders). Add R, Q, AA, and CC if your work touches steel, concrete, confined spaces, or cranes.
What is the fall protection height requirement in construction?
Generally six feet above a lower level under 1926.501. Scaffolds use a ten-foot trigger under Subpart L, and steel erection generally uses fifteen feet under Subpart R, with separate provisions for connectors.
Do I have to memorize OSHA standards for an open-book exam?
No, but you do need to know where things live. The exam is timed, so the practical skill is mapping a question to a subpart and confirming the answer in the text quickly rather than reciting the standard from memory.
Does passing the NASCLA exam make me a licensed contractor?
Not by itself. Passing satisfies the trade examination requirement in participating jurisdictions. Most states also require a business and law exam plus experience, financial, and insurance documentation. Check with your state licensing board.
The bottom line
The OSHA book is not a text to memorize — it is a tool to operate. Know that Part 1926 covers construction, know which subpart owns which hazard, know the handful of thresholds that repeat, and tab the book so your hand goes to the right page without thinking. Do that and OSHA questions become some of the fastest points on the exam instead of the ones that drain your clock.
Then keep using it. The contractors who build the safest jobsites are usually the ones still opening this book long after the exam is behind them.
Pass the NASCLA Exam on Your First Attempt
Our online course covers every approved reference, including how to navigate the OSHA book under exam conditions. Study at your own pace and walk in ready.
Licensing requirements, exam specifications, and approved reference editions vary by jurisdiction and change over time. Verify current requirements with NASCLA , PSI, and your state licensing board before scheduling.