What is IEC 60079-2:2014?

IEC 60079-2:2014 is a technical standard developed by the International Electrotechnical Commission (IEC) to provide guidelines for the design, selection, and installation of electrical equipment in areas where there is a risk of explosion due to the presence of flammable gases, vapors, or combustible dust. This standard specifically addresses the classification of hazardous locations and provides the necessary measures to ensure the safe operation of equipment within these areas.

Hazardous Locations Classification

The first step in ensuring electrical safety in hazardous locations is properly classifying them. According to IEC 60079-2:2014, hazardous locations are divided into three main categories: Zone 0, Zone 1, and Zone 2. Zone 0 refers to areas where explosive gas atmospheres are continuously present, while Zone 1 includes areas where such atmospheres may occasionally be present during normal operating conditions. Zone 2 encompasses areas where explosive gas atmospheres are unlikely to occur but may do so for short periods.

For each zone, the standard outlines specific requirements for electrical installations, such as equipment selection, wiring methods, and protection techniques. It also provides guidance on factors like temperature ratings, ingress protection (IP) codes, and marking requirements. These measures aim to prevent the ignition of potentially explosive atmospheres and minimize the possibility of accidents.

Equipment Selection and Installation

IEC 60079-2:2014 emphasizes the importance of selecting and installing appropriate electrical equipment for hazardous locations. Electrical devices intended for these environments must meet stringent criteria to ensure their safe operation. This includes considerations for their construction, materials, and protection level against various environmental factors.

The standard also addresses the concept of "Explosion Protection Levels" (EPLs) for different types of equipment. It categorizes them into three levels: Ga, Gb, and Gc, based on their level of protection against gas atmospheres. Similarly, it denotes three levels of protection for equipment suitable for use in combustible dust environments: Da, Db, and Dc.

Furthermore, IEC 60079-2:2014 provides insights into installation requirements, such as proper wiring techniques, grounding practices, and appropriate sealing methods. Compliance with these guidelines ensures that electrical equipment is adequately protected and reduces the risk of ignition and subsequent explosions.

Ongoing Compliance and Maintenance

The final aspect covered by IEC 60079-2:2014 pertains to ongoing compliance and maintenance practices for electrical equipment in hazardous locations. The standard stresses the importance of regular inspections and testing to verify the continued safety and performance of installed equipment.

Routine maintenance activities outlined in the standard include cleaning, checking for degradation or damage, verifying correct equipment operation, and replacing worn-out components. Additionally, the document highlights that any modifications or repairs should be conducted by qualified personnel who understand the intricacies of hazardous locations and the specific requirements of the standard.

In conclusion, IEC 60079-2:2014 plays a vital role in ensuring the safety of electrical equipment operating in hazardous areas. By providing detailed guidelines for classification, selection, and installation, this standard helps minimize the risks associated with explosive atmospheres. Adhering to these requirements not only prevents accidents but also promotes a safer working environment for employees in industries exposed to potentially dangerous substances.