7.3 Major Workplace Hazards: Falls, Entanglement, Electric Shock, and Fires

7.3 Major Workplace Hazards: Falls, Entanglement, Electric Shock, and Fires

Core Vocational Reality: The official curriculum includes fall, caught-in or entanglement, electric-shock, and fire or explosion hazards. Learn the Korean hazard term, the unsafe condition shown, and the control stated in the passage. Do not rely on an unsupported percentage or assume one control fits every machine.

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1. Overview of the "Big 4" Industrial Disasters (산업재해 4대 다발 재해 개요)

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2. Hazard 1: 추락 (Falls from Heights) — Scaffolding, Openings, and Ladders

Falls from height (추락) account for the highest fatality rate in Korean construction and exterior maintenance. The EPS-TOPIK carefully tests the linguistic distinction between different types of falls:

• 추락 (떨어짐 / Fall from Height): A person falling from an elevated structure (scaffolding, roof, high platform) down to the ground.
• 전도 (넘어짐 / Slip or Trip): A person slipping on water/oil or tripping over wires on the same floor level.
• 낙하 / 비래 (물체에 맞음 / Struck by Falling Object): Loose tools or building materials falling from above and striking a worker below.

Critical Structural Fall Prevention Measures

[Elevated Worksite Fall Safeguards]
├── 1. 개구부 덮개 (Opening Cover) ──> Bolted secure cover with "개구부 주의" warning sign
├── 2. 안전난간 (Safety Guardrail)  ──> Upper rail (90cm+), intermediate rail, toe board (발끝막이판)
├── 3. 안전망 (Safety Netting)       ──> Tensioned catch net installed 1-2 floors beneath work face
└── 4. 안전대 체결 (Harness Lanyard) ──> Snap hook latched securely to certified lifeline (구명줄)

1. 개구부 (Floor Openings): Uncovered gaps or shafts in concrete floor slabs are lethal fall hazards. Regulations require a rigid wooden or metal cover (개구부 덮개) securely fixed in place, painted with high-visibility hazard stripes, and labeled with clear warning text ("개구부 추락주의 / 임의개방 금지").
2. 비계 (Scaffolding): Use inspected scaffolding with the guardrail, midrail, toe-board, access, and fall-protection components required by the current design and site procedure. Read any dimensions from the supplied rule rather than assuming one diagram applies to every scaffold.
3. 사다리 (Ladders): Portable A-frame stepladders (A형 사다리) must have spreader locks fully engaged. Workers must maintain three-point contact (3점 지지 / two hands and one foot, or two feet and one hand), never stand on the top step, and always wear a strapped hard hat.

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3. Hazard 2: 협착 / 끼임 (Entanglement & Nip Points)

Mechanical entanglement (협착 / 끼임) is the dominant hazard in Korean manufacturing plants operating automated machinery. Body parts (fingers, hands, clothing, hair) are drawn into mechanical pinch points or in-running nip points (물림점):

The Cotton Glove Ban Near Rotating Machinery (엄격한 목장갑 착용 금지!)

An important safety rule concerns knitted cotton work gloves around spinning cylinders:

Statutory Rule: Around rotating machinery—including rubber rollers (롤러기), drill presses, lathes (선반), milling cutters, and conveyor pulleys—workers are STRICTLY FORBIDDEN from wearing loose cotton work gloves (면 목장갑 착용 금지).

Technical Rationale: Loose knitted gloves, hair, jewelry, and clothing can be caught by rotating parts. Do not wear loose cotton gloves around exposed rotation. Use guards, stop and isolate the machine before reaching into a danger zone, secure hair and cuffs, and wear only the hand protection specified by the machine risk assessment; do not substitute a blanket recommendation to work bare-handed.

Essential Machinery Safeguards (기계 방호장치)

• 방호덮개 (Protective Cover / Safety Guard): Fixed metal or transparent polycarbonate enclosures shielding rotating gears, belt pulleys, and cutting blades. Interlocked guards automatically cut motor power if opened.
• 광전자식 안전장치 (Photoelectric Light Curtain): An invisible optical infrared beam array projected across the stamping press throat. If a worker's hand interrupts the beam, the press slide halts instantly.
• 양수조작식 안전장치 (Two-Hand Control Device): A dual-pushbutton control mechanism requiring the operator to depress two separated buttons simultaneously with both hands, ensuring hands cannot be inside the die zone during press strokes.
• 비상정지장치 (Emergency Stop Button): Prominent red mushroom-head pushbuttons (비상정지 스위치) positioned within immediate reach of machine operators to instantly abort mechanical operations.

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4. Hazard 3: 감전 (Electric Shock & Arc Flash Hazards)

Electric shock (감전) occurs when the human body becomes part of an active electrical circuit. Water reduces skin electrical resistance by up to 90%, turning mild leakage into lethal ventricular fibrillation:

The Three Commandments of Electrical Safety

1. 젖은 손 조작 절대 금지 (Never Touch Electrical Controls with Wet Hands): Operating power switches, plugging in extension cords, or operating portable electric tools with wet hands or while standing in standing water is strictly prohibited.
2. 누전차단기 정상 가동 확인 (Earth-Leakage Protection / ELCB): Use the protective device required for the circuit and environment. Trip rating, response time, inspection interval, and who may test it come from the electrical design, device instructions, and site procedure.
3. 외함 접지 실시 (Implement Equipment Grounding / 접지): All metal casings of motors, welding transformers, and machinery must be connected to ground earth wires (접지선). If internal insulation fails, ground wires route fault currents safely into the soil rather than through the operator's body.

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5. Hazard 4: 화재 및 폭발 (Fires & Explosions) & The PASS Extinguisher Method

Workplace fires (화재) and chemical explosions (폭발) ignite when combustible fuels, oxygen, and ignition sparks coincide. Korean industrial plants classify fires into three main categories:

• A급 화재 (일반 화재): Wood, paper, textiles, plastics (leaves ash; extinguish with water/dry chemical).
• B급 화재 (유류 화재): Flammable liquids, thinners, gasoline, oil paints (extinguish with dry chemical / CO2; NEVER spray water, which spreads floating fuel).
• C급 화재 (전기 화재): Live electrical wiring, motors, transformer panels (extinguish with non-conductive dry chemical / gas; never use water).

The 4-Step PASS Method for Portable Fire Extinguishers (소화기 사용법 4단계)

EPS-TOPIK exam items heavily test the sequential four steps for deploying a portable ABC dry chemical fire extinguisher (분말소화기):

[PASS Fire Extinguisher Technique]
1단계: 안전핀 뽑기  ──> Place on ground, pull the safety ring pin firmly
2단계: 호스 향하기   ──> Stand with wind at back (바람을 등지고), point nozzle at flame base
3단계: 손잡이 누르기 ──> Squeeze the upper operating lever handle firmly
4단계: 쓸듯이 분사   ──> Sweep side-to-side like a broom (빗자루로 쓸듯이) across flame base

1. 1단계 (안전핀을 뽑는다 / Pull the Pin): Place the extinguisher upright on the ground and yank out the metal ring safety pin (안전핀).
2. 2단계 (바람을 등지고 호스를 불길 쪽으로 향한다 / Aim the Nozzle): Stand with the wind at your back (바람을 등지고) at a distance of 2 to 3 meters. Exam Trap: Never stand facing into the wind (바람을 마주보고), which blows extinguishing powder and toxic smoke back into your face.
3. 3단계 (손잡이를 힘껏 움켜쥔다 / Squeeze the Handle): Firmly squeeze the upper operating lever against the carrying handle to puncture the internal propellant cartridge.
4. 4단계 (빗자루로 쓸듯이 좌우로 분사한다 / Sweep Side to Side): Aim directly at the base of the fire (화원의 밑바닥) and sweep the nozzle back and forth in a smooth broom-like sweeping motion until flames are smothered.

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6. Authentic Workplace Dialogue: Machine Safety & Glove Rules

Setting: A high-speed metal roll-forming and stamping shop in Daegu. Production Foreman Lee (이 주임) conducts a safety walkthrough with Min (민), an E-9 worker from Vietnam.

이 주임 (Foreman Lee): 민 씨, 잠깐 기계 멈추고 이쪽으로 와 봐요. 지금 손에 끼고 있는 장갑이 면 목장갑이지요? (Min, stop the machine for a moment and come over here. Are those gloves on your hands cotton work gloves?)

민 (Min): 네, 주임님. 손이 시리고 미끄러워서 작업대 옆에 있던 목장갑을 꼈습니다. (Yes, Foreman. My hands were cold and slippery, so I put on the cotton work gloves that were next to the workbench.)

이 주임 (Foreman Lee): 큰일 날 뻔했네요! 롤러기나 회전 기계를 다룰 때는 목장갑을 착용하는 것이 법으로 엄격히 금지되어 있어요. 실밥이 롤러 회전축에 말려 들어가면 순식간에 손 전체가 협착되어 빨려 들어갑니다. (That could have caused a huge disaster! When handling rollers or rotating machinery, wearing cotton gloves is strictly prohibited by law. If the glove threads get caught in the rotating roller shaft, your entire hand will be entangled and sucked in in an instant.)

민 (Min): 앗, 정말 죄송합니다. 롤러기에서는 장갑 실밥이 끼일 수 있다는 것을 깜빡했습니다. 지금 바로 벗겠습니다. (Oh, I am truly sorry. I forgot that glove threads could get caught in the roller. I will take them off right now.)

이 주임 (Foreman Lee): 그래요. 롤러기 작업을 할 때는 맨손으로 작업하거나 손에 딱 밀착되는 특수 밀착 장갑을 써야 해요. 그리고 옷소매 단추도 단단히 채우고 방호덮개가 제대로 닫혀 있는지 확인하세요. (Right. Do not wear loose knitted gloves near the rollers. Keep the guard closed, secure sleeves and hair, and use only the hand protection specified for this machine and task.)

민 (Min): 알겠습니다, 주임님. 즉시 복장을 단정히 하고 방호덮개를 확인한 후 작업하겠습니다. (Understood, Foreman. I will immediately tidy my clothes and check the protective guard before working.)

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7. EPS-TOPIK Question Traps & High-Yield Distractors

1. The Fall vs. Slip Trap: Confusing 추락 (falling from an elevation to a lower level) with 전도 (slipping/tripping on level ground). If a worker falls off a ladder or scaffold, the answer is always 추락 사고.
2. The Cotton Glove Trap: Test questions often ask: "다음 중 회전하는 롤러기 작업 시 올바르지 않은 행동은 무엇입니까?" (Which is incorrect behavior when working around rotating rollers?). The correct answer to this negative prompt is always "손을 보호하기 위해 두꺼운 면 목장갑을 끼고 작업한다" (wearing thick cotton work gloves to protect hands—a dangerous violation).
3. Extinguisher Wind Direction: Questions regarding fire extinguishers may present distractors such as "바람을 마주보고 서서 분사한다" (spraying facing the wind). The only correct phrase is "바람을 등지고 서서" (standing with the wind at one's back).