How to configure an explosion-proof distribution box

Explosion-proof distribution boxes are configured with flameproof enclosures, certified electrical components, cable entries, and optional monitoring or control devices to ensure safe operation in hazardous environments.

Enclosure and Material

• Flameproof enclosures (Ex d, Ex tb) made from 304 or 316L stainless steel or copper-free aluminum alloy with powder-coated surfaces for corrosion resistance .
• Specialized hinge structures to prevent damage to flameproof joints during opening and closing, extending service life .
• Sizes and modularity: Boxes can be combined or installed freely to save space and meet system requirements .

Electrical Components

Explosion-proof distribution boxes can include a wide range of electrical devices depending on application needs:

• Power and control devices: PLCs, soft starters, frequency converters, motor protection switches, dual power transfer switches .
• Protection devices: Fuses, integrated motor protectors, solid-state relays, diode modules .
• Monitoring and control: Current and voltage monitors, temperature and humidity controllers, counters, timers, fire monitoring controllers .
• Lighting and display: Light-operated switches, display screens, magnetic ballasts for HID lamps, electronic ballasts for fluorescent lamps, LED drivers, emergency devices .
• Power supply: UPS systems and batteries .

Cable Entry and Wiring

• Standard entry holes: M ☐ x 1.5 plugs; NPT plugs available on request .
• Cable glands: Optional, with recommended models DQM-II (Ex d) or DQM-III (Ex d) for safe connections .
• Direction and size of each cable entry should be specified according to installation requirements .

Installation Methods

• Mounting options: Vertical, hanging, concealed, or exposed installations .
• Surface-mounted or concealed: PXT series for surface-mounted, with optional concealed installation marked as (R), .

Voltage and Current Ratings

• Voltage levels: Commonly 220V or 380V, depending on system requirements .
• Rated current and short-time withstand current: Specified per model, e.g., 250A/10kA, adjustable per customer needs .

Model Examples

• Low-voltage withdrawable switchgear: GCK, GCS, MNS .
• Low-voltage fixed switchgear: GGD, GDH, PGL .
• Comprehensive distribution boxes: XZW .
• Box-type substations: ZBW .
• Terminal lighting distribution boxes: PZ20, PZ30 .
• Electric metering boxes: PZ40, XDD(R), .

Certifications

• ATEX and IECEx certified for Zone 1 and Zone 2 hazardous areas .
• Temperature and gas group ratings: Ex db IIC T6…T4, Ex tb IIIC T80°C…T130°C, depending on model . This configuration ensures that explosion-proof distribution boxes are safe, durable, and adaptable for industrial environments with flammable gases, vapors, or dust. Proper selection of components, cable entries, and installation methods is critical to meet both safety standards and operational requirements.