Introduction to the Test

- Classification of hazardous areas is a method of analyzing the environment in which explosive atmosphere (gas, dust) can occur and classifying the hazardous area and the non-hazardous area.
- In Korea, it shall be carried out at workplaces that manufacture, handle or use flammable liquid, gas or vapour, solids at industrial sites in accordance with the Articles 230 and 311 of the Rules on Occupational Safety and Health.
- Employer has to prepare and manage "Drawing for classification of hazardous areas and electrical block diagram" in accordance with Article 130, Paragraph 2 of the Rules on Occupational Safety and Health.

Applied field

List for flammable substance and characteristics
List for source of release
Drawing for classification of hazardous areas
(IEC 60079 series, industrial codes and national standards.)


Explosive gas atmosphere
- Oil and gas processing plant
- Oil and gas carrying & drilling vessels
- Oil refinery plant
- Chemical facility plant
- Semiconductor factory
- Ship, Vessel and Offshore plant etc.

Explosive dust atmosphere
- Printing industry
- Textile mill
- Metal factory
- Wastewater treatment facility
- Grain handling, storage and processing factory
- Sugar refinery factory
- Woodworking plant etc.

Industry sector

Test Standard

Explosive gas atmosphere
IEC 60079-10-1:2015
KS C IEC 60079-10-1: 2015
E-150-2017 ~ E-153-2017
KGS GC101 2018
AS/NZS (IEC) 60079-10-1:2009
IP 15 Edition 4
IGEM/SR/25 Edition 2
API RP 505 Edition 2
NFPA 59A (2019)
NFPA 497 (2017)

Explosive dust atmosphere
IEC 60079-10-2: 2015
KS C IEC 60079-10-2: 2014

Hazardous Area Classification

Procedure for classification of hazardous areas

Presentation of hazardous areas

Example for classification of hazardous area

Contact Person

Yeo, Seokgwang

Seo Ho Young

Yun Jaeik