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Under OSHA 1926 Subpart L, who qualifies as a 'competent person' for scaffold work?

Any worker with at least 2 years of scaffold experience

A person capable of identifying existing and predictable hazards and who has authority to take prompt corrective measures

A licensed structural engineer who has reviewed the scaffold plans

A foreman who has attended a 10-hour OSHA construction course

to track

2026 Statistics

Key Facts: SAIA CP Systems Scaffolds Exam

0.5 m

Rosette Node Spacing

Manufacturer TDS (Layher, Haki, Peri)

12 in

Max Screw Jack Extension

Manufacturer TDS

4:1

Freestanding Height-to-Base Ratio

OSHA 1926.451(c)(1)

10 ft

Fall Protection Trigger

OSHA 1926.451(g)(1)

26/30 ft

Max Tie Intervals (V/H)

OSHA 1926.451(c)(1)

125 ft

EUD Plan Required Above

ANSI A10.8-2019

System (modular) scaffolds — ring-lock and cup-lock — are the backbone of large commercial and industrial scaffold projects worldwide. The SAIA Competent Person — Systems Scaffolds course covers the engineering details that make these systems unique: rosette nodes at 0.5 m increments, wedge-head and cup-lock connections, bay spacing, max leg loads, screw jack extension limits, and the OSHA/ANSI rules that govern erection, ties, fall protection, and daily inspection. Passing requires knowing OSHA 1926 Subpart L, ANSI A10.8-2019 modular scaffold requirements, and manufacturer-specific TDS data for Layher, Haki, Peri Up, and Cuplock systems.

Sample SAIA CP Systems Scaffolds Practice Questions

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1Under OSHA 1926 Subpart L, who qualifies as a 'competent person' for scaffold work?

A.Any worker with at least 2 years of scaffold experience

B.A person capable of identifying existing and predictable hazards and who has authority to take prompt corrective measures

C.A licensed structural engineer who has reviewed the scaffold plans

D.A foreman who has attended a 10-hour OSHA construction course

Explanation: OSHA defines a competent person as someone with the knowledge and ability to identify existing and predictable hazardous conditions in the environment or working conditions that are unsanitary, hazardous, or dangerous, and who has the authority to take prompt corrective measures to eliminate those hazards. This is the standard used throughout 1926 Subpart L for scaffold oversight duties.

2Ring-lock (rosette) and cup-lock systems are both classified as which scaffold type under ANSI A10.8-2019?

A.Tube-and-coupler scaffolds

B.System (modular) scaffolds

C.Frame and brace scaffolds

D.Mast-climbing work platforms

Explanation: ANSI A10.8-2019 classifies ring-lock, cup-lock, and similar proprietary interlocking connector systems as system (modular) scaffolds. These differ from tube-and-coupler scaffolds (arbitrary assembly using separate tubes and clamps) and from frame scaffolds (welded end frames). The defining feature is the integral, engineered connection node — a rosette or cup — built into the vertical standard.

3On a ring-lock system scaffold, rosettes are typically spaced at approximately what interval along the vertical standard?

A.0.25 m (approximately 10 inches)

B.0.5 m (approximately 20 inches)

C.1.0 m (approximately 39 inches)

D.1.5 m (approximately 59 inches)

Explanation: Ring-lock system scaffolds such as Layher Allround, Haki, and Peri Up use rosettes (connection nodes) spaced at approximately 0.5 m (50 cm) increments along each vertical standard. This consistent module allows ledgers, transoms, diagonal braces, and access components to attach at any node, providing high geometric flexibility for working platform heights.

4What is the primary function of a transom in a system scaffold?

A.To provide diagonal bracing in the face of the scaffold

B.To carry the working platform boards perpendicular to the building face

C.To resist lateral wind forces by tying into the structure

D.To extend the working platform beyond the outer standard as a cantilever

Explanation: Transoms (also called putlogs in some systems) run perpendicular to the building face and directly support the working platform planks or decking units. They transfer platform loads to the ledgers, which in turn transfer to the vertical standards. In system scaffolds, transoms typically connect via the rosette or cup at each level.

5OSHA 1926.451(f)(6) specifies minimum electrical clearance distances for uninsulated power lines. What is the minimum clearance required for lines rated 50 kV or below?

A.3 feet (0.9 m)

B.10 feet (3.0 m)

C.15 feet (4.6 m)

D.20 feet (6.0 m)

Explanation: OSHA 1926.451(f)(6) requires a minimum clearance of 10 feet (3.0 m) from uninsulated energized power lines rated 50 kV or less when scaffolds are erected or used near them. For lines above 50 kV, add 0.4 inches per kV above 50 kV. The competent person must assess electrical hazards before erection and ensure clearance is maintained during use.

6During erection of a system scaffold, the competent person observes a wet and muddy base condition. Which is the correct response?

A.Proceed if the mud depth is less than 6 inches

B.Require that mudsills, base plates, and screw jacks be installed before continuing

C.Double the number of ties to compensate for soft ground

D.Contact the building owner and wait 48 hours for the soil to dry

Explanation: OSHA 1926.451(c)(2) requires that supported scaffolds be erected on base plates and mudsills or other adequate firm foundation. Soft, muddy, or yielding ground requires mudsills (typically 2×10 or wider lumber) to spread the leg load, screw jacks to allow leveling, and base plates to seat the standard properly. Proceeding without adequate foundation creates a collapse hazard regardless of mud depth.

7The scaffold tagging system uses three colors. What does a YELLOW tag indicate?

A.The scaffold is fully inspected and safe for use as erected

B.The scaffold is under construction or has restrictions — use only as directed

C.The scaffold is unsafe and must not be used

D.The scaffold has been decommissioned and is awaiting disassembly

Explanation: The SAIA/industry scaffold tag system uses green for 'safe to use as erected,' yellow for 'caution — restricted use, use only as directed by the competent person,' and red for 'do not use — scaffold is unsafe.' A yellow tag alerts workers that conditions exist (incomplete planking, missing guardrail on one side, restricted load, etc.) that require specific instructions before use.

8At what maximum intervals must vertical ties be provided on a system scaffold, per OSHA 1926.451(c)(1)?

A.Every 20 feet vertically and every 30 feet horizontally

B.Every 26 feet vertically and every 30 feet horizontally

C.Every 30 feet vertically and every 26 feet horizontally

D.Every 4 scaffold levels vertically and every 3 bays horizontally

Explanation: OSHA 1926.451(c)(1) requires ties, guys, or braces at the closest horizontal member to the 4:1 height-to-width ratio point, and then at vertical intervals not exceeding 26 feet thereafter. The horizontal spacing shall not exceed 30 feet. These are maximum intervals — the manufacturer's recommendations and the qualified engineer's design may require closer spacing depending on height, wind loads, and surcharge.

9What does the 4:1 height-to-base-width ratio rule determine for a freestanding system scaffold?

A.The maximum allowable platform live load

B.The height at which the first tie to the structure must be installed

C.The minimum number of diagonal braces required in each bay

D.The maximum permitted scaffold height before a licensed engineer is required

Explanation: OSHA 1926.451(c)(1) requires that a supported scaffold be tied to the structure when its height exceeds four times its minimum base width (4:1 ratio). Until this point, freestanding erection is permissible. Beyond the 4:1 threshold, the first tie must be placed at or below the closest horizontal member, then at 26-foot vertical intervals thereafter.

10A cup-lock scaffold standard uses a lower cup welded to the standard and an upper cup that locks over it. What is the correct assembly sequence when connecting a ledger?

A.Insert the ledger blade into the lower cup, then hammer the upper cup down to lock

B.Slide the upper cup up first, insert the ledger blade into the lower cup, lower the upper cup over the blades, and hammer to lock

C.Insert all four ledgers simultaneously and then drop the upper cup in one motion

D.Tack-weld the ledger blade to the standard for permanent connection before use

Explanation: The correct cup-lock assembly procedure is: (1) raise the upper cup to the open position, (2) insert the ledger blade into the fixed lower cup socket, (3) lower the upper cup over all inserted blades (up to four components can be connected at one node), and (4) strike the upper cup firmly with a hammer to seat it in the locked position. The locked upper cup prevents accidental disengagement under load.

About the SAIA CP Systems Scaffolds Exam

The SAIA Competent Person — Systems Scaffolds credential trains and certifies workers to identify hazards, perform pre-shift inspections, and enforce OSHA 1926 Subpart L and ANSI A10.8-2019 requirements for ring-lock (Layher, Haki, Peri Up) and cup-lock modular scaffold erection, use, and dismantling.

Questions

100 scored questions

Time Limit

Varies by delivery format

Passing Score

70%

Exam Fee

Contact SAIA at saiaonline.org (Scaffold & Access Industry Association (SAIA))

SAIA CP Systems Scaffolds Exam Content Outline

20%

System Scaffold Components & Connection Mechanisms

Rosette nodes (0.5 m spacing), ring-lock wedge-head connections, cup-lock upper/lower cup assembly, ledgers, transoms, standards, screw jacks, base plates, Layher Allround, Haki TS, Peri Up, and Cuplock system comparisons

20%

Erection Planning & Load Calculations

Bay spacing selection, leg load verification from TDS, screw jack extension limits (12 in max), mudsill and foundation requirements, erection sequence with lift-by-lift diagonal installation, load categories (light/medium/heavy duty), and 4:1 safety factor

20%

Competent Person Duties & OSHA Definitions

OSHA 1926.32 definitions, pre-shift inspection requirements, post-event inspection, stop-work authority, worker training under 1926.454, qualified vs. competent person distinction, and ANSI A10.8-2019 EUD plan requirements above 125 ft

15%

Ties, Bracing & Stability

4:1 height-to-base ratio, first tie placement, OSHA tie intervals (26 ft vertical, 30 ft horizontal), face diagonal and plan bracing functions, freestanding height limits, hoist arm overturning effects, and cantilevered platform engineering

15%

Fall Protection & Platform Requirements

OSHA 1926.451(g) 10-ft trigger, guardrail heights (38-45 in top rail, mid-rail at midpoint), toeboards, PFAS during erection/dismantling, platform width (18 in min), plank gap (1 in max), plank overhang (12 in max), and face gap (14 in max)

10%

Inspection, Tagging & Hazard Identification

Green/yellow/red scaffold tag system, tag content requirements, defective component criteria (dents, cracks, loose wedges), weather hazard response, electrical clearance per 1926.451(f)(6), and falling object protection

How to Pass the SAIA CP Systems Scaffolds Exam

What You Need to Know

Passing score: 70%
Exam length: 100 questions
Time limit: Varies by delivery format
Exam fee: Contact SAIA at saiaonline.org

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

SAIA CP Systems Scaffolds Study Tips from Top Performers

1Know the rosette node spacing (0.5 m = ~20 in) and Layher Allround's 8-hole rosette geometry (connections at 45° increments) — system-specific details appear in SAIA systems scaffold exams

2Memorize the maximum screw jack extension (12 inches for most systems) and the reason: threaded rod buckling resistance drops rapidly with extension

3Understand the 4:1 height-to-base ratio rule and calculate the freestanding limit for common bay widths (e.g., 2.57 m base → 10.28 m max freestanding)

4Know OSHA tie intervals (26 ft vertical, 30 ft horizontal) and that the first tie goes at or below the 4:1 ratio point

5Learn the scaffold tag color system: green = safe, yellow = restricted use with conditions, red = do not use

6Practice recognizing when a qualified person or PE review is required: cantilevered platforms, mixed manufacturer components, EUD plans above 125 ft, slab-supported scaffolds

Frequently Asked Questions

What OSHA standard covers system scaffolds?

System (modular) scaffolds in construction are covered under OSHA 29 CFR 1926 Subpart L. Section 1926.451 contains general scaffold requirements, 1926.452(w) addresses mobile scaffolds, and 1926.454 covers training. ANSI A10.8-2019 provides supplemental requirements for system scaffold erection plans above 125 feet.

What is the difference between ring-lock and cup-lock system scaffolds?

Ring-lock scaffolds (Layher Allround, Haki TS, Peri Up Rosett) use a rosette plate welded to the standard with wedge-head connections that are individually driven into rosette holes. Cup-lock scaffolds use a fixed lower cup and a sliding upper cup that locks all inserted blade ends simultaneously with one hammer blow. Both are system (modular) scaffolds under ANSI A10.8-2019.

What is the maximum screw jack extension on a system scaffold?

Most ring-lock and cup-lock manufacturers specify a maximum screw jack extension of 12 inches (300 mm) beyond the coupling collar. Exceeding this reduces the threaded rod's buckling resistance. Always verify the maximum extension in the manufacturer's Technical Data Sheet (TDS) for the specific system being used.

At what height is fall protection required on a system scaffold?

OSHA 1926.451(g)(1) requires fall protection for employees on scaffolds at heights of 10 feet or more above a lower level. A guardrail system and/or personal fall arrest system must be provided. During erection and dismantling when guardrails cannot be in place, PFAS is permitted as the sole fall protection method per 1926.451(g)(2).

What are the OSHA tie requirements for a system scaffold?

OSHA 1926.451(c)(1) requires the first tie at or below the closest horizontal member to the 4:1 height-to-base ratio point, then at vertical intervals not exceeding 26 feet and horizontal intervals not exceeding 30 feet. Manufacturer requirements and project engineer specifications may require closer spacing.

What does ANSI A10.8-2019 require for tall system scaffolds?

ANSI A10.8-2019 requires a written erection, use, and dismantling (EUD) plan prepared by a qualified person for scaffolds exceeding 125 feet in height. The plan must address foundation conditions, design loads, tie locations, erection sequence, and hazard controls.

What do the scaffold tag colors mean?

Green means the scaffold is fully inspected and safe for use as erected. Yellow means caution — the scaffold has restrictions and must be used only as directed by the competent person. Red means do not use — the scaffold is unsafe and must not be entered until cleared by the competent person.