Who must be certified to operate a crane on a construction site?

Under 29 CFR 1926.1427, the employer must verify that every operator is certified by an accredited testing entity — typically NCCCO, CIC, NCCER, or an audited employer program — and that the certification type matches the crane type and capacity. Operator-in-training (OIT) is only permitted when assigned to a certified operator who maintains continuous visual or radio contact. The operator must be re-certified whenever the certification type changes, and the certification document must be available at the site for inspection.

How must load charts and rated-capacity indicators work?

Under 29 CFR 1926.1417 and §1926.1415, every crane must have a load chart in the cab, visible to the operator, covering every configuration the crane can be set up in (boom length, jib, outrigger extension, counterweight). A rated-capacity indicator (RCI) or automatic crane controller is required per §1926.1415 and must be operational and verified at the start of each shift. The operator must verify the load weight against the chart before every lift; exceeding rated capacity is a Subpart CC violation independent of whether the crane actually collapses.

What does a daily crane inspection cover under §1926.1412?

Under 29 CFR 1926.1412, a competent person must inspect the crane before each shift and document any defects. The inspection covers: ground conditions and outrigger pads; structural members (boom, jib, mast, pins, welds); wire rope (broken wires, kinks, corrosion, proper reeving); hooks and hook blocks (cracks, deformation, safety latches); hydraulic and air systems (leaks, pressures, hose condition); safety devices (A2B, RCI, load moment indicator, anti-two-block, limiting devices); and operator-protective devices. Defects that affect safe operation must be corrected before the crane returns to service and the inspection record retained.

Construction Safety | 29 CFR 1926 Subpart CC

Cranes & Derricks Safety for Construction (29 CFR 1926.1400) (2025)

Q: When is a qualified signal person required on a crane?

A signal person is required under 29 CFR 1926.1428 whenever the operator cannot see the load, the landing zone, or the travel path. The signal person qualifies by completing documented training and a competence assessment covering the standard hand signals from Subpart CC Appendix A and voice/radio communication. The signal person is independent of the rigger unless the rigger has been separately qualified, and a single qualified signal person can serve multiple cranes only when one signal person maintains communication with all operators.

Q: What is anti-two-block (A2B) prevention and when is it required?

A two-block event is when the hook block contacts the boom tip — typically shearing the load line, dropping the load, and dropping the boom or block onto workers below. Under 29 CFR 1926.1416, an anti-two-block (A2B) device is required on every crane greater than 2-ton rated capacity on which a two-block event is possible. The A2B must be operational and verified at the start of each shift; bypassing or disabling the A2B to make a lift work is a Subpart CC violation in its own right.

Q: When does fall protection trigger on a crane boom?

Under 29 CFR 1926.1423 (which carves out from Subpart M §1926.501), fall protection is not required for workers on the boom during assembly/disassembly when they are 6 feet or less above a lower level; above 6 feet, a 100% tie-off personal fall-arrest system is required — anchored lanyard or retractable lifeline attached to a structural member independent of the boom being assembled. PFAS is also required whenever a worker is on a fixed-length boom more than 6 feet above a lower level outside of A/D. The Subpart CC boom rules are distinct from, and more specific than, the §1926.501 construction fall protection duty.

Subpart CC (29 CFR 1926.1400–1926.1441) governs every power-operated crane and derrick on a construction site — ground conditions and assembly/disassembly, operator certification and signal-person qualification, fall protection on the boom, anti-two-block prevention, load charts and rated-capacity indicators, inspection, and the operational rules for working around power lines. Any site where a crane enters, erects, or lifts is in Subpart CC — and violations carry penalties up to $161,323 per citation.

29 CFR 1926.1400–1926.1441

Electrocution, Tip-Over & Two-Block

Updated for 2025

Why It Matters

Crane tip-overs, two-block events, and boom electrocutions are leading causes of construction fatalities — and most happen because a certification, a signal person, or a ground check was missing before the lift

The Bureau of Labor Statistics and NIOSH FACE reports consistently rank crane-related events among the leading causes of construction fatalities. The fatality pattern is well known and almost entirely preventable: a crawler tips because the ground was soft and the outrigger pads were undersized; a boom contacts an overhead line because the §1926.1408 clearance table was never consulted; a hook block staples a rigger because the A2B device was bypassed to make a lift work; an unqualified operator drops a load because no cert was checked at the gate; a boom falls during A/D because no A/D director was on site. The deaths concentrate where the operator certification has lapsed, where the signal person was never qualified, where the ground was not verified before the lift, and where the A2B device was bypassed.

Subpart CC exists to consolidate every piece of that risk into one set of duties: the §1926.1400 scope and definitions, the §1926.1402 ground-conditions duty, the §1926.1424 assembly/disassembly director rule, the §1926.1427 operator-certification and §1926.1428 signal-person-qualification duties, the §1926.1423 boom fall-protection carve-out, the §1926.1415/§1926.1416/§1926.1417 load-chart and A2B rules, and the §1926.1412 daily inspection duty. A cert in the cab, a documented signal person, a green-ground check, and a working A2B cost minutes to verify; a citation or a crane fatality cost orders of magnitude more.

~25–50/year

workers killed in crane / derrick-related incidents (BLS / NIOSH FACE construction-fatality data — electrocution, tip-over, two-block, struck-by)

7 sections + composed cards

covering §§1926.1400–1926.1441 — scope, ground conditions, A/D, operator certification, signal-person qualification, boom fall protection, A2B / load chart, and the composed cards for daily inspection and pre-lift verification

29 CFR 1926 Subpart CC

Breaking down the cranes and derricks safety regulations

Subpart CC (29 CFR 1926.1400–1926.1441) sets the rules for every power-operated crane and derrick on a construction site — the §1926.1400 scope and definitions, §1926.1402 ground conditions, §1926.1424 assembly/disassembly, §1926.1427 operator certification, §1926.1428 signal-person qualification, §1926.1423 boom fall protection, and §1926.1415/§1926.1416/§1926.1417 load charts, RCI, and A2B prevention.

29 CFR 1926.1400

Scope, Application & Definitions

Subpart CC (29 CFR 1926.1400–1926.1441) covers every power-operated crane and derrick used in construction — including mobile cranes, crawler cranes, tower cranes, and articulating cranes. It defines "crane", "derrick", "hoist", "competent person", "qualified person", "ground conditions", "load chart", and "rated capacity". Subpart CC applies whenever a crane is being assembled, disassembled, operated, or tested on a construction site. It excludes mobile cranes operated on public roads (covered by DOT FMCSA rules), railroad equipment, and maritime equipment covered by 29 CFR 1917. Any other crane on a construction site is in Subpart CC from the moment the outriggers are set through the moment the load is dropped at the end of the shift.

29 CFR 1926.1402

Ground Conditions

Under §1926.1402, the ground on which a crane is assembled and operated must be firm, drained, level, and capable of supporting the crane plus its maximum intended load. Assembly must be disabled where the ground is soft, frozen, recently disturbed, or otherwise unable to bear the load. Outrigger pads must be sized to the soil bearing capacity and the maximum outrigger load; the assembly/disassembly director has the authority to stop the lift if the ground is inadequate. §1926.1402 is its own frequently-cited subsection in OSHA enforcement data, and ground failure is the leading cause of crane tip-overs in NIOSH FACE reports.

29 CFR 1926.1424

Assembly & Disassembly

Section 1926.1424 requires assembly and disassembly to be directed by an A/D director — the competent person who oversees the procedure, selects the procedure from the manufacturer or a qualified person, and has the authority to stop work. Pinning and structural connections must be verified by a qualified person before the load is applied; the §1926.1424(a)(1) "A/D procedures" rule is the leading Subpart CC citation in OSHA enforcement data. §1926.1424(d) lists the operations prohibited during A/D — riding the headache ball, walking the boom with workers on it, and pinning or unpinning while the boom is under load.

29 CFR 1926.1427

Operator Certification

Section 1926.1427 places the duty on the employer to verify that every operator of a crane covered by Subpart CC is certified by an accredited testing entity — typically NCCCO, CIC, NCCER, or an audited employer program. The certification type must match the crane type and capacity; a certification for a 30-ton lattice-boom crawler does not cover a 100-ton hydraulic truck crane. Operator-in-training (OIT) is permitted only when assigned to a certified operator who maintains continuous visual or radio contact, and the OIT cannot operate the crane outside the visual or radio range of the certified operator.

29 CFR 1926.1428

Signal Person Qualification

A signal person is required under §1926.1428 whenever the operator cannot see the load, the landing zone, or the travel path. The signal person must qualify by completing documented training and a competence assessment covering the standard hand signals from Subpart CC Appendix A and voice/radio communication. The signal person is independent of the rigger unless the rigger has been separately qualified on the standard hand signals. A single qualified signal person can serve multiple cranes only when that signal person is able to maintain communication with every operator simultaneously; multiple signal persons are required otherwise.

29 CFR 1926.1423 & §1926.501

Fall Protection on the Boom

Section 1926.1423 carves the boom of a crane out of the general Subpart M §1926.501 construction fall protection duty and replaces it with a more specific rule: no fall protection is required for workers on the boom 6 feet or less above a lower level during assembly/disassembly, but at more than 6 feet a 100% tie-off personal fall-arrest system is required — anchored lanyard or retractable lifeline attached to a structural member independent of the boom being assembled. PFAS is also required for any worker on a fixed-length boom more than 6 feet above a lower level outside of A/D. The boom fall-protection duties are distinct from, and more specific than, the §1926.501 construction fall protection duty.

29 CFR 1926.1416 & §1926.1417

Two-Block Prevention & Rated Capacity / Load Charts

Under §1926.1416, an anti-two-block (A2B) device is required on every crane greater than 2-ton rated capacity on which a two-block event is possible — a two-block event shears the load line, drops the load, and drops the boom or hook block onto workers below. The A2B must be operational and verified at the start of each shift; bypassing the A2B to make a lift work is a Subpart CC violation. Under §1926.1417 and §1926.1415, the load chart must be in the cab, visible to the operator, and a rated-capacity indicator (RCI) or automatic crane controller must be operational. The operator must verify the load weight against the chart before every lift; exceeding rated capacity is a Subpart CC violation independent of whether the crane actually collapses.

2025 OSHA cranes-and-derricks citation penalties

OSHA adjusts its civil penalty amounts annually for inflation under the Federal Civil Penalties Inflation Adjustment Act. As of January 2025:

Violation Type	Maximum Penalty Per Citation	Typical Trigger
Willful or Repeat	$161,323	Employer knowingly operated a crane without a §1926.1427-certified operator, knowingly continued lifting over energized power lines without the clearance required by §1926.1408, knowingly proceeded with assembly/disassembly without an A/D director per §1926.1424, or knowingly bypassed a required A2B device; same Subpart CC violation cited within 5 years
Serious	$16,132	Substantial probability of death or serious physical harm from a missing operator cert, an unqualified signal person under §1926.1428, a two-block event that an operational A2B would have prevented, operation over a buried or overhead power line without the §1926.1408 clearance table, or operation on soft ground that violated §1926.1402
Other-than-Serious	$16,132	Subpart CC violation with direct relationship to safety but low probability of death or serious physical harm (e.g., shift inspection log present but missing a competent-person signature, or the load chart in the cab but missing the configuration that the crane was set up in)
Failure to Abate	$16,132/day	Operator certification gap, missing A/D director program, signal-person qualification deficiency, A2B bypass, or load-chart / RCI deficiency not corrected by the OSHA-specified abatement deadline

Note:A single crane entry can produce multiple Subpart CC citations — no operator cert under §1926.1427, no signal person under §1926.1428, A/D without a director under §1926.1424, ground that violated §1926.1402, an A2B device bypassed to make a lift work, and a load chart that didn't match the boom configuration each represent independent compliance duties.

Source: OSHA penalty adjustment schedule. Amounts are updated annually under the Federal Civil Penalties Inflation Adjustment Act Improvements Act of 2015.

Free Resource

Use our OSHA construction safety checklist before your next crane entry or pre-lift verification

Our free printable checklist covers cranes and derricks alongside nine other construction safety categories — 50+ items drawn from 29 CFR 1926. Subpart CC ground conditions, A/D director, operator cert, signal-person qualification, A2B device, and load-chart / RCI verification are folded into the checklist alongside scaffolding, fall protection, PPE, electrical, and the other Subpart-aligned categories so you can run a pre-lift crane check and the surrounding compliance layers in one pass.

Operator certification verified per §1926.1427 before crane enters site (NCCCO or audited employer program; certification type & capacity match the crane)
Ground conditions confirmed firm, drained, level with adequate bearing capacity (§1926.1402); outrigger pads sized to the soil; assembly disabled if conditions are inadequate
A/D director on site for the assembly/disassembly sequence (§1926.1424); pinning verified by a qualified person before load is applied
Signal person designated and qualified per §1926.1428 when the operator cannot see the load, the landing zone, or the travel path
Anti-two-block device operational, load chart in the cab, RCI verified at start of shift — before any lift

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Common Questions

Cranes & derricks safety under 29 CFR 1926.1427, answered

Related OSHA Construction Safety Pages

Three more OSHA construction safety pages that bind to cranes and derricks

A crane never enters a site alone — workers climb ladders to reach the boom, wear PPE to stay clear of the load, and stand on scaffolding to make the A/D connection. These three pages cover the adjacent safety categories a crane operator, rigger, or A/D director needs on the same lift.

29 CFR 1926.1050

Stairs, Ladders & Railing Safety

Workers reach the boom tip and the A/D connection points by climbing boom-mounted ladders — §1926.1050–§1926.1053 set the rules for every fixed and portable ladder on the access path, including the boom-tip ladder and the A/D access ladder that the foreman and rigger climb to make the connection.

Read the ladder safety page

29 CFR 1926.200

Working Overhead & Falling Objects

A dropped load under §1926.1424 / §1926.1417 is a struck-by hazard — §1926.200 + §1926.202 set the rules for toeboards, canopies, and debris netting that protect workers below a crane lift from the dropped hook block, the boomed load, and any rigging that lets go mid-lift.

Read the falling objects page

29 CFR 1926.451

Scaffolding Safety

The boom A/D setup and the footing decisions the operator makes before the lift are the same shape as a scaffold footing decision — §1926.451 covers the scaffold that crews work on adjacent to the crane, plus the platform that the A/D director uses to access the boom-pin point during assembly.

Read the scaffolding safety page

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