NCCCO Crane Wire Rope Inspection: Removal-From-Service Criteria and OSHA 1926.1413 for the Crane Operator Exam (2026)
NCCCO crane exam guide to wire rope inspection: shift, monthly, and annual intervals, the three deficiency categories, and OSHA 1926.1413 removal rules.
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This guide solves the next-step problem for Crane candidates: it explains what matters, then gives you a direct way to test that knowledge with practice questions instead of guessing what to study next.
TL;DR
Wire rope inspection is one of the most testable clusters on the NCCCO Core exam because OSHA wrote it as a checklist, not a judgment call. The whole topic sits inside OSHA 1926.1413, and it comes down to three things: who inspects and how often (a competent person before each shift, monthly, and a qualified person at least every 12 months), what counts as a deficiency (three categories, from significant distortion down to a single broken strand), and what you do when you find one (replace the rope, sever out the localized damage, or tag the equipment out — never splice). The single most-tested number is the broken-wire count for running rope: six randomly distributed broken wires in one rope lay, or three broken wires in one strand in one lay. Learn the intervals, the categories, and the removal rules, and you convert a whole block of the exam into reliable points on the 90-question, 2.5-hour Core test that gates your operator card.
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The NCCCO Exam and Why Wire Rope Inspection Matters
The NCCCO (National Commission for the Certification of Crane Operators) program is the industry-standard credential, and OSHA has required certified operators for most construction crane work since the enforcement date of November 2018. There are roughly 80,000-plus licensed crane operators in the United States, and the count keeps rising because the card is now non-negotiable on most jobsites — a big reason the median crane operator wage sits around $35 to $45 an hour. To earn the card you pass the NCCCO Core written exam (90 questions in 2.5 hours), at least one specialty, and a practical. The Core exam leans on OSHA Subpart CC because that is where operators actually get hurt or killed, and dropped loads from failed hoist rope are near the top of that list. That is why wire rope inspection gets so much exam attention: the load line is the one component standing between the load and the ground, and the standard spells out — in countable terms — when it is no longer safe to use. Build the foundation with the [Crane Prep app](/apps/crane).
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Three Inspection Intervals: Shift, Monthly, Annual
The first thing the exam wants you to know is who inspects and how often, because 1926.1413 defines three distinct intervals. The shift inspection is a visual check by a competent person, begun before each shift the equipment is used and completed before or during that shift; it covers both running and standing ropes likely to be in use, and — importantly — it does not require untwisting the rope or booming down to see hidden sections. The monthly inspection is the same shift inspection performed once a month, but it must be documented, and the rope cannot be returned to use until the inspection shows no corrective action is required. The annual (comprehensive) inspection is the deep one: at least every 12 months a qualified person inspects the entire length of the rope, including the sections normally hidden during shift and monthly checks, reverse bends, and rope passing over sheaves. A useful exam distinction is the person: shift and monthly inspections are done by a competent person, while the annual is done by a qualified person. There is also a feasibility exception worth remembering — if the comprehensive inspection cannot be done because of the equipment's setup (say it would take an assist crane) or site conditions (a dense urban setting), it must be done as soon as feasible, but no more than an additional six months for running ropes. See how inspection fits the larger setup picture on the [crane study track](/study/crane).
The Three Deficiency Categories
OSHA sorts apparent wire rope deficiencies into three categories, and the exam loves to ask which category a described condition falls into. Category I is about structure and end connections: significant distortion of the rope such as kinking, crushing, unstranding, birdcaging, or signs of core failure and steel core protrusion between the outer strands; significant corrosion; electric arc or heat damage; and improperly applied or badly corroded, cracked, bent, or worn end connections. Category II is the broken-wire and diameter category: visible broken wires at the counts below, plus a diameter reduction of more than 5% from nominal. Category III is the short, high-severity list: in rotation-resistant rope, core protrusion or distortion indicating core failure; prior contact with an energized power line; and a single broken strand. The reason the categories matter is that they drive different removal outcomes — Category I gives the competent person a judgment call, while a broken strand (Category III) or a rope that touched a power line is far more restrictive. Drill the category sorting with a [timed bank of NCCCO practice questions](/questions/crane).
The Broken-Wire Counts You Must Memorize
This is the highest-yield fact in the entire topic, and it is pure memorization. For running wire rope, the rope is a Category II deficiency when there are six randomly distributed broken wires in one rope lay, or three broken wires in one strand in one rope lay. A 'rope lay' is the length along the rope in which one strand makes a complete revolution around the rope — so the count is always measured within that repeating distance, not per foot. For rotation-resistant rope, the threshold is tighter: two randomly distributed broken wires in six rope diameters, or four randomly distributed broken wires in 30 rope diameters. For pendants and standing wire ropes, the limit is more than two broken wires in one rope lay in the body of the rope beyond end connections, and/or more than one broken wire in a rope lay located at an end connection. On top of all of that, any rope worn down more than 5% below its nominal diameter is removed regardless of broken-wire count. The exam trap here is mixing the running-rope 'six in a lay / three in a strand' with the rotation-resistant 'two in six diameters / four in 30 diameters' — they are different rope types with different rules, and a well-written distractor will hand you the wrong one. The same measurement discipline that keeps load-chart radius honest applies here; reinforce the numbers on the [crane load and setup calculator](/tools/crane-load).
Removal From Service: Replace, Sever, or Tag Out
Finding a deficiency is only half the question — the exam also wants to know what you legally do next, and the answer depends on the category. For a Category I deficiency, the competent person must make an immediate determination of whether it constitutes a safety hazard; if it does, use of that rope is prohibited until the rope is replaced or, if the damage is localized, the problem is corrected by severing the rope in two and using the undamaged portion. For Category II, use is prohibited until the employer meets the wire rope manufacturer's removal criterion (or an approved alternative), replaces the rope, or severs out the localized damage. For Category III, the rope is prohibited until replaced or severed — with one hard rule: a rope that contacted an energized power line cannot be repaired at all. Three constants run through every category and show up as exam answers. First, joining lengths of rope by splicing is always prohibited. Second, whenever a rope is shortened by severing, the employer must ensure the drum still has at least two wraps of wire when the load or boom is at its lowest position. Third, whenever a rope must be removed from service, either the whole machine or the specific hoist must be tagged out per 1926.1417(f)(1) until the rope is repaired or replaced. One more practical rule the test likes: rope lubricants of a type that hinder inspection are not allowed, because they hide the very deficiencies you are supposed to catch.
Common Mistakes That Cost Points
Four errors account for most missed questions in this cluster. First, swapping the running-rope and rotation-resistant broken-wire counts — six-in-a-lay is running rope, not the two-in-six-diameters rotation-resistant figure. Second, forgetting the two-wraps-on-the-drum rule after severing, which is a favorite 'what must the employer ensure?' answer. Third, thinking a damaged rope can be spliced back together; splicing is never permitted, only severing and discarding the bad portion. Fourth, mixing up the inspector: shift and monthly inspections are a competent person's job, the annual comprehensive inspection is a qualified person's. A subtler fifth trap is the power-line rope — candidates apply the general 'repair if localized' logic and miss that a rope that touched an energized line can never be repaired. When a question describes a rope condition, slow down and classify it first (which category?), then answer what happens (replace, sever, or tag out), because the exam is built to reward that two-step read.
How to Study This So It Sticks
This topic rewards clean categorization far more than rereading. Make one card that sorts every condition into Category I (distortion, corrosion, arc/heat, bad end connections), Category II (broken-wire counts and the 5% diameter reduction), and Category III (rotation-resistant core failure, power-line contact, a broken strand). Make a second card with only the four broken-wire numbers — six in a lay / three in a strand for running rope, two in six diameters / four in 30 diameters for rotation-resistant, more than two in a lay / more than one at an end connection for standing rope — and quiz yourself until they are reflexive, because that is exactly how the exam frames them. Then layer the removal actions on top: replace, sever (two wraps, no splicing), or tag out per 1926.1417. Finally, get real reps in the exact exam wording. Use the VoltExam [crane study track](/study/crane) to see inspection in the context of setup and rigging, the [timed NCCCO practice questions](/questions/crane) to drill the 'which category / how many wires' phrasing, and the [crane load and setup calculator](/tools/crane-load) to keep your radius-and-capacity measurements as disciplined as your rope counts.
Ready to master crane wire rope inspection?
Wire rope inspection is one of the highest-yield, most memorizable clusters on the NCCCO Core exam, and one of the easiest to lock down once you stop reading paragraphs and start sorting conditions by category and action. Download the Crane Prep app to study OSHA Subpart CC, load charts, rigging, and site conditions on your phone between lifts, and try free NCCCO practice questions on VoltExam to see exactly how these inspection-and-removal problems are worded on test day. Start now at the [Crane Prep app](/apps/crane).
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