추락·비계+유해+화재 핵심정리 15문제 | 추락방지·밀폐공간·안전모 (산업안전지도사·건설안전기술사)

📝 Integrated Summary of Falls, Scaffolding, Hazards, and Fire | Industrial Safety Instructor & Construction Safety Professional Engineer 15 questions from 12 years, with an 80% question rate. We summarize the four key points, ranging from the 3 steps of fall prevention to fire watchers and safety helmets. ※ This corrected version is a fully updated version covering the provisions on scaffolding, fall protection nets, falling object prevention nets, system scaffolding, confined spaces, and fire watchers, based on the Rules on Occupational Safety and Health Standards (current, effective March 2, 2026). ━━━━━━━━━━━━━━━━━━━━━━ ⏱️ Timeline 00:00 Intro — 15 Questions, 80% Question Rate 00:27 Key Point 1. 3 Steps of Fall Prevention — Link to Past Questions (13th Exam) 00:56 Standards for Safety Handrails, Fall Protection Nets, and Safety Belts 01:51 Memorization Points + Checkpoints 02:32 Key Point 2. Types of Scaffolding and Safety Standards — Link to Past Questions (15th Exam) 03:02 Comparison of Steel Pipe, System, Mobile, and Trestle Scaffolding 03:59 Memorization Points + Checkpoints 04:38 Key Point 3. Safety Measures for Confined Space Work — Link to Past Questions (6th Exam) 05:03 Oxygen Concentration, Ventilation, Protective Equipment, Supervisors, and Training 05:46 Memorization Points 06:06 Key Point 4. Fire Watchers + Safety Helmets and Protective Equipment — Link to Past Questions (Episode 14) 06:31 Role of Fire Watchers + Safety Helmet Grades & Durability 07:06 Memorization Points 07:23 Expected Exam Question 1. Standards for Protective Measures for Openings, etc. (Article 43) 07:54 Expected Exam Question 2. 5 Fire Prevention Safety Measures for Welding and Cutting Operations 08:32 Final Review + Next Episode Preview 09:21 Outro ━━━━━━━━━━━━━━━━━━━━━━ 📌 Key Summary 📖 Key Point 1. 3 Stages of Fall Prevention (Standard Rules Articles 13, 42, and 43) [Stage 1] Installation of Safety Handrails — Upper handrail must be at least 90cm, structure capable of withstanding a load of at least 100kg [Stage 2] Fall Protection Net — ① Vertical distance to installation point must not exceed 10m ② Net sag must be at least 12% of the length of the shorter side ③ Overhang length must be 3m from the wall End [Stage 3] Wearing safety harness — Installation of attachment equipment [Common] Places with a risk of falling (work platforms, edges of openings, etc.), work at heights of 2m or more [Note] Caution: Do not confuse with fall protection nets (Article 14) — Fall protection nets are "at intervals of no more than 10m in height / protruding length of 2m or more from the wall surface / 20~30° relative to the horizontal plane" 💡 "Fall protection net / 10m · 12% · 3m (fall protection net) / 2m · 20~30° (fall protection net)" 📖 Key Point 2. Types of Scaffolding and Safety Standards (Standard Rules Articles 59~71) [Steel Tube Scaffolding] Column spacing: 1.85m or less in the tie beam direction · 1.5m or less in the joist direction; tie beam spacing: 2.0m or less Wall Joints (Appendix 5) Single Tube Scaffolding: Vertical 5m · Horizontal 5m (When preparing structural review and assembly drawings) (Short beams and joists each 2.7m or less allowed) [System Scaffolding] Installation spacing of wall connecting materials shall be installed in accordance with "standards set by the manufacturer" (Article 69, Item 5) [Mobile Scaffolding] Wheel locking devices and outriggers; riding while moving is prohibited [Horse Scaffolding] Height 2m or less, platform width 40cm or more 💡 "Steel pipe 1.85/1.5/2.0 / System manufacturer's standard / Mobile locking / Horse 2m or less" 📖 Key Point 3. Safety Measures for Work in Confined Spaces (Standard Rules Articles 618~624) [Adequate Air] Oxygen 18% or more but less than 23.5%, Carbon dioxide less than 1.5%, Carbon monoxide less than 30ppm, Hydrogen sulfide less than 10ppm (Article 618) [Ventilation] Supply and exhaust ventilation devices; forced ventilation before and during work if natural ventilation is insufficient [Protective Equipment] Respiratory protective equipment such as air-supplied masks and self-contained breathing apparatus (prohibition of using gas masks alone) [Rescue System] Deployment of observers + rescue equipment (ladders, lifelines, air-supplied masks, tripods, etc.) [Training] Special safety and health training + completion and management of entry permits before entering confined spaces 💡 "O₂ 18~23.5% · CO₂ 1.5% · CO₂ 30 · H₂S 10" 📖 Key Point 4. Fire Watcher + Safety Helmets and Protective Equipment (Standard Rule Article 241-2, Article 32) [Fire Watcher] Deployment during welding or cutting in areas containing flammable materials within a work radius of 11m (Article 241-2) Duties: ① Check for the presence of flammable materials ② Check the operation of gas detection and alarm devices ③ Guide workers to evacuate in the event of a fire The employer shall provide evacuation equipment such as loudspeakers, portable lighting fixtu...