💡 3 Key Takeaways
- The legal basis for Korea's 5-gas mandatory measurement is Article 619-2 of the Industrial Safety and Health Standards Rules.
- The 2017 amendment added CO₂ to the previous 4-gas requirement (O₂·CO·H₂S·LEL), making 5-gas mandatory.
- The December 1, 2024 amendment mandates equipment provision, 3-year record retention, and 119 reporting by safety monitors.
Legal Basis for 5-Gas Mandatory Measurement
| Gas | Acceptable Range | Risk |
|---|---|---|
| O₂ | 18% – 23.5% | Asphyxiation |
| CO | Below 30 ppm | Poisoning |
| H₂S | Below 10 ppm | Lethal at high levels |
| CO₂ | Below 1.5% | Asphyxiation (added 2017) |
| LEL | Below 10% | Explosion |
The legal foundation for Korea's 5-gas mandatory measurement in confined spaces is Article 619-2 of the Industrial Safety and Health Standards Rules ("Measurement of Oxygen and Hazardous Gas Concentrations"). The 5 gases are O₂, CO, H₂S, CO₂, and LEL.
📅 2017 Amendment: 4 Gases → 5 Gases
Before 2017, only 4 gases (O₂·CO·H₂S·LEL) were required. The 2017 amendment added CO₂ after repeated asphyxiation accidents in septic tanks, wastewater facilities, and fermentation sites. CO₂ is colorless and odorless — workers cannot perceive rising levels. Above 3% causes breathing difficulty; above 7-8% causes unconsciousness; above 10% is lethal.
📅 December 1, 2024 Amendment: 4 Key Changes
Source: Ministry of Employment and Labor announcement, December 1, 2024.
- Equipment provision mandate — Employers must provide measurement equipment to designated measurers
- 3-year record retention — Measurement and assessment results must be kept for 3 years
- Safety monitor 119 reporting — Immediate emergency call when worker abnormalities detected
- Enhanced safety training — Worker awareness of risks and safety rules verified before work
Accepted Record Formats
The Ministry recognizes any format that records measurer, time, location, and proper-air status:
- Handwritten records
- Excel/digital files
- Video + audio recordings
- Cloud auto-storage (DCMS, IoT-based) — most reliable
⚖️ Penalties and Serious Accident Punishment Act
- OSH Act violation causing death: Up to 7 years imprisonment or KRW 100M fine for employer
- Serious Accident Punishment Act (50+ employees): 1+ year imprisonment or KRW 1B fine for executive
- Corporate vicarious liability: Up to KRW 5B fine
From January 2024, the Serious Accident Punishment Act extended to workplaces with fewer than 50 employees.
✅ How EDW500 Satisfies All Legal Requirements
- 5-gas simultaneous measurement: O₂·CO·H₂S·CO₂·LEL ✅
- Portable — easy per-worker provision ✅
- DCMS auto-storage + auto-email = 3-year retention solved ✅
- Real-time PC/smartphone alarms for monitor response ✅
- Auto-record of time, location, worker ID ✅
🏆 EDW500 — All OSH 5-Gas Requirements in One Device
Measurement + recording + 3-year retention + alarm, all automated
📚 Related Guides
📖 5-Gas Detector Complete Guide 2026
5-gas definitions & selection
📖 5-Gas Detector TOP 5 Comparison
Product comparison
📖 Confined Space Safe Work Procedures
Pre-entry procedures
📖 Septic Tank · Manhole · Wastewater Cases
6 real-world cases
Closing — The Law Continues to Strengthen
From the 2017 5-gas mandate to the 2024 equipment provision, 3-year retention, and 119 reporting requirements, Korea's OSH regulations continue to strengthen. The Serious Accident Punishment Act adds further pressure on employers. Fortunately, IoT-based 5-gas detectors like EDW500 can automatically satisfy all requirements with a single device.
📞 OSH 5-Gas Compliance Consultation
Tell us your worksite and headcount — we'll recommend the optimal EDW500 configuration.
📷 EDW500 OSH 5-Gas Mandatory Measurement Photo Gallery
See real photos of EDW500 satisfying 5-gas measurement, 3-year data retention, and explosion-proof certification requirements.
