Scaffold Safety Fundamentals and Hazard Awareness
Know the roles
Every scaffold safety question starts with who is responsible. An authorized person is approved to work on or around scaffolds. A competent person can identify existing and predictable hazards and has authority to take prompt corrective action - this is the person who inspects, trains, and stops work. A qualified person has a recognized degree, certificate, or professional standing and performs design-level work such as engineering a non-standard scaffold. Question writers love swapping these terms; match the duty to the definition.
The recurring hazards
Falls are the leading cause of scaffold fatalities, followed by struck-by (falling tools, dropped components), electrical contact, and collapse from overloading or a poor foundation. Other predictable hazards include missing guardrails or toeboards, defective planking, an unstable base, unsafe access such as climbing cross braces, wind, ice, and using the scaffold as a material rack. Keep platforms clear of debris and excess material; a scaffold is a work platform, not storage.
Rules of thumb
- Fall protection is required when a platform is 10 feet or more above a lower level.
- Keep scaffolds at least 10 feet from energized power lines up to 50 kV; more for higher voltages.
- A supported scaffold whose height exceeds four times its minimum base dimension must be restrained with guys, ties, or braces.
Worked example: A frame scaffold is 24 ft tall with a 5 ft × 5 ft base. Height-to-base = 24 ÷ 5 = 4.8:1, greater than 4:1, so it must be tied to the structure or otherwise restrained. Height alone does not decide; the ratio does.