Overview

This technical document discusses the general adaptation of equipment for use in explosive atmospheres, specifically focusing on medium voltage electrical equipment and their compliance with European standards (EN). It addresses the requirements for equipment intended for use in hazardous areas classified by explosion risk.

Main Sections

1. General Adaptation of Equipment

The document outlines the adaptation of medium voltage equipment to meet the requirements for use in explosive atmospheres. It emphasizes the importance of compliance with the European standard EN 60079 series, which covers equipment for explosive atmospheres.

2. Classification of Hazardous Areas

It describes the classification of hazardous zones based on the presence and frequency of explosive atmospheres. The zones are defined according to the likelihood and duration of explosive gas or dust presence, following the European Norm EN 60079-10-1 for gas and EN 60079-10-2 for dust atmospheres.

3. Equipment Protection Levels and Categories

The document details the categorization of equipment based on protection levels suitable for different zones. It explains the use of equipment categories (1, 2, 3) corresponding to high, medium, and low protection levels, respectively, and their appropriate application in various hazardous zones.

4. Adaptation Procedures and Measurement

Procedures for adapting equipment include ensuring the equipment meets the required protection level and functional safety. The document highlights the importance of measuring and verifying the equipment's performance in the intended hazardous environment, including the use of specific measurement tools and methods.

5. Standards and Normative References

The document references several standards and normative documents essential for compliance, including EN 60079 series and related technical specifications. It also mentions the use of harmonized standards for conformity assessment and certification.

6. Equipment Marking and Documentation

Guidelines for marking adapted equipment are provided, ensuring clear identification of protection levels, categories, and suitability for specific hazardous zones. Documentation requirements for traceability and verification are also discussed.

7. Calibration and Maintenance

Calibration services for measurement and adaptation tools are addressed, emphasizing the need for regular calibration to maintain accuracy and compliance. Maintenance procedures for adapted equipment are also briefly mentioned.

Key Points and Recommendations

• Adaptation of medium voltage equipment must comply with EN 60079 standards for explosive atmospheres.
• Hazardous zones must be classified accurately according to European norms to determine appropriate equipment categories.
• Equipment categories correspond to protection levels and must be selected based on zone classification.
• Measurement and verification procedures are critical to ensure equipment safety and functionality.
• Proper marking and documentation are essential for compliance and traceability.
• Calibration and maintenance of adaptation tools and equipment must be regularly performed.

Conclusion

This document serves as a comprehensive guide for adapting medium voltage electrical equipment for use in explosive atmospheres, ensuring compliance with European standards and safety requirements. It provides detailed procedures for classification, adaptation, measurement, and certification to guarantee safe operation in hazardous environments.