Class I, Division 2 transformers are electrical transformers designed and certified for use in hazardous locations where flammable gases, vapors, or liquids are present under normal operating conditions. These hazardous environments are classified based on the likelihood of the presence of explosive or flammable substances.
The classification system used to define hazardous locations is outlined by the National Electrical Code (NEC) in the United States, and it’s also recognized in many other countries. Class I refers to locations where flammable gases, vapors, or liquids are or may be present. Division 2 specifies that the hazardous substances are present under abnormal conditions, such as leaks or failures, but not under normal operating conditions.
Here’s what you need to know about Class I, Division 2 transformers:
- Purpose: Class I, Division 2 transformers are designed to operate safely in environments where the potential for ignitable concentrations of flammable substances is not likely to occur frequently or for prolonged periods. These transformers are constructed and equipped with features to minimize the risk of causing an ignition in such environments.
- Construction: Transformers built for Class I, Division 2 environments are designed with enhanced safety features to prevent the release of sparks, arcs, or excessive heat that could ignite flammable substances. They might have explosion-proof enclosures, sealed housings, and specialized gaskets to contain potential hazards.
- Certification and Standards: To ensure the safety and reliability of these transformers, they must undergo testing and certification by recognized third-party organizations. In the United States, certification bodies such as Underwriters Laboratories (UL) provide testing and certification services for equipment intended for use in hazardous locations.
- Installation: Class I, Division 2 transformers need to be installed following specific guidelines and standards to ensure their safe operation. Proper wiring methods, grounding, and protection against external influences are crucial. Only trained and qualified personnel should handle the installation.
- Maintenance: Regular maintenance and inspections are necessary to ensure the continued safe operation of Class I, Division 2 transformers. Any signs of damage, wear, or malfunction should be addressed promptly.
- Markings and Labels: Transformers designed for use in hazardous locations are typically labeled with appropriate markings and labels to indicate their suitability for specific environments. These markings include the Class, Division, Group (defining the type of hazardous substance), and other relevant information.
- Application Areas: Class I, Division 2 transformers are commonly used in industries such as petrochemical, oil and gas, chemical processing, and other facilities where the presence of flammable substances requires special precautions.
It’s crucial to adhere to all relevant safety regulations, standards, and guidelines when using transformers in hazardous locations. Working with certified and reputable manufacturers, distributors, and installers ensures that the equipment is appropriate for the intended environment and will operate safely.