IEC 60079-18:2025

Overview

IEC 60079-18:2025 is an international standard issued by the International Electrotechnical Commission (IEC) that specifies the requirements for electrical equipment protection in explosive atmospheres through encapsulation, designated as Type of Protection "m". This standard applies to electrical Ex Equipment, components, and parts intended for hazardous environments with explosive gas or dust atmospheres.

The fifth edition of IEC 60079-18 supersedes the 2014 edition and its 2017 amendment, providing an updated technical framework aligned with the general requirements outlined in IEC 60079-0. It covers equipment with rated voltages up to 11 kV for protection levels "mb" and "mc", and up to 1 kV for protection level "ma". By focusing on encapsulation methods, this standard helps ensure the operational safety and reliability of electrical apparatus used in potentially explosive locations.

Key Topics

• Scope and Applicability
  IEC 60079-18:2025 specifically addresses encapsulation techniques for explosion protection, supplementing IEC 60079-0. It covers electrical equipment and components designed for use in explosive gas and dust atmospheres, ensuring protection levels "ma", "mb", and "mc" with defined voltage limits.

• Construction and Materials Requirements
  The standard details mandatory requirements for the encapsulating compound properties such as water absorption, dielectric strength, maximum surface, and service temperatures. It defines minimum compound thickness and free space distances to prevent ignition risks.

• Equipment Design and Testing
  Guidelines on constructional aspects include managing potential faults, separating isolating components, and protecting live parts. It also outlines rigorous testing protocols, including dielectric strength, thermal endurance, pressure resistance, and routine verification procedures to confirm encapsulation integrity.

• Protective Devices and Batteries
  IEC 60079-18 specifies conditions for internal protective devices like electrical and thermal protectors and provides detailed requirements to prevent hazards related to cells, batteries, or energy storage components such as gas emission, temperature risks, reverse current, and polarity inversion.

• Marking and Documentation
  To ensure traceability and compliance, the standard requires clear markings on equipment, indicating type of protection, rated voltage, protection level, and other relevant data. This facilitates correct installation and maintenance in hazardous areas.

Applications

• Hazardous Area Electrical Equipment
  IEC 60079-18:2025 is essential for manufacturers designing electrical apparatus used in industries such as oil and gas, chemical processing, mining, pharmaceuticals, and food production where explosive atmospheres may be present.

• Encapsulated Electrical Components
  This standard applies extensively to components like sensors, control units, motors, and printed circuit boards that require encapsulation to isolate electrical parts from explosive substances.

• Safety-Critical Power Systems
  Equipment needing high reliability under explosive conditions benefits from the encapsulation methods described here, ensuring minimized ignition risk and enhanced operational safety.

• Certification and Compliance
  Users can leverage the requirements and tests in IEC 60079-18 to verify compliance for obtaining explosion protection certification marks, aligning with international regulations and market access criteria.

Related Standards

• IEC 60079-0: Explosive Atmospheres – Part 0: Equipment – General Requirements
  Provides the foundational principles and general requirements for all equipment intended for explosive atmospheres, which IEC 60079-18 complements and specifies for encapsulation protection.

• IEC 60079 Series
  Other parts of the IEC 60079 family deal with different types of protection such as flameproof enclosures (Ex d), increased safety (Ex e), intrinsic safety (Ex i), and pressurization (Ex p).

• ISO/IEC Standards on Electrical Safety
  Where applicable, related ISO/IEC documents covering electrical safety and environmental testing further support comprehensive equipment safety in hazardous areas.

Keywords: IEC 60079-18, explosive atmospheres, encapsulation "m", explosion protection standard, electrical Ex Equipment, hazardous area equipment, equipment protection level, explosive gas atmospheres, explosive dust atmospheres, IEC 60079-0, encapsulated electrical components, safety certification, electrical equipment standards.