BARTEC EJB Flameproof Enclosures (Ex d IIB+H2) – A Technical Review – ATEX Hazardous Area
The primary function of the EJB enclosure is containment. It is engineered to absorb the force and neutralize the heat of an internal electrical explosion, preventing ignition from propagating to the external flammable atmosphere.
Key Certification and Classification
The EJB series meets strict global and regional explosion protection standards, ensuring maximum application versatility:
- ATEX Classification (Directive 2014/34/EU): Group II, Category 2G 2D.
- Gases (Zone 1/2): Ex db IIA or IIB or IIB+H2 T6…T3. The IIB+H2 rating is crucial, indicating suitability for environments containing highly volatile gases like Hydrogen.
- Dusts (Zone 21/22): Ex tb IIIC T85°C…T200°C.
- Protection Degree: IP66.
- Ambient Temperature: Standard range from -60°C to +80°C
- Certifications: Includes ATEX, IECEx, INMETRO, NEC 505 (NEMA 1, 12, 4, 4X), CCC, and more.
Construction and Mechanical Integrity
The structural integrity of the EJB is designed for long-term reliability in corrosive and harsh industrial settings:
| Component | Material Specification |
| Body/Cover | Marine grade copper-free aluminium light alloy |
| Screws | Stainless steel |
| Internal Mounting Plate | Hot dip galvanized steel/aluminum |
| Hinges | Cast on enclosure body and cover (on the long side) |
Optional Accessories for Customisation
The enclosures can be customised to specific site requirements with accessories, including:
- Glass windows on the cover for viewing internal instrumentation.
- Internal anticondensate painting (orange RAL-2004).
- External epoxy painting with colour on request.
- Drain and breather valves
EJB Model Range and Internal Capacity
The EJB series features a range of sizes, primarily identified by a two-digit code (e.g., EJB-21A), where the difference between models like EJB-71 and EJB-73 often relates to the enclosure’s depth.
| Enclosure Code | Internal Plate (X-Y) [mm] | Weight [kg] | Max. Operators Permitted |
| EJB-21A | 180 x 140 | 11.20 | 12 |
| EJB-31A | 325 x 225 | 24.20 | 30 |
| EJB-51A | 460 x 260 | 36.10 | 54 |
| EJB-61A | 560 x 360 | 68.10 | 56 |
| EJB-63A | 560 x 360 | 50.50 | 56 |
| EJB-71 | 590 x 390 | 110.40 | 48 |
| EJB-73 | 590 x 390 | 95.60 | 48 |
| EJB-91 | 750 x 448 | 188.50 | 54 |
| EJB-93 | 750 x 448 | 166.50 | 54 |
Note: The internal plate size dictates the usable mounting area for components.
Key Applications for EJB Enclosures
BARTEC EJB enclosures are designed to fully integrate standard industrial electrical equipment into hazardous areas as control or distribution panels. Typical applications include:
- Terminal and Busbar Junctions: Providing a safe connection point for high-current and high-voltage wiring.
- Motor Starter Boxes: Housing contactors, thermal relays, and circuit breakers for motor control.
- Control Stations: Integrating a large number of operators like push buttons, pilot lights, and selector switches, with the larger EJB-51, EJB-61/63, and EJB-91/93 models allowing 50+ operators.
- Distribution Panels: Protecting standard industrial components such as fuses, transformers, circuit breakers, relays, and PLCs within the hazardous zone
The combination of robust construction, high current/voltage ratings, and extensive global certification ensures the EJB series is the definitive choice for reliable and safe electrical control in demanding hazardous process industries.