Explosion-proof distribution boxes
- Protection type: Ex d flameproof / Ex e increased safety / Ex p pressurized, selected by hazardous zone and gas group
- Hazardous zone: Zone 1 / Zone 2 gas, Zone 21 / 22 dust, configured by classification
- Qualification: produced in joint supply with an Ex-qualified manufacturer; Ex certificates available for verification
- Material: cast aluminum / steel plate / stainless steel, selected by protection type and environment
- Customization: circuit count, components and cable entry/exit built to project and explosion protection requirements
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Type of protection | Ex d flameproof / Ex e increased safety / Ex p pressurized, selected by hazardous zone and gas group |
|---|---|
| Hazardous area | Zone 1 / Zone 2 gas, Zone 21 / 22 dust (configured by classification) |
| Material | Cast aluminum / steel plate / stainless steel, selected by protection type and environment |
| Standard dimensions | Built to circuit count and protection type; wall-mounted or floor-standing |
| Surface treatment | Explosion-proof surface treatment; weather-resistant and anti-corrosion for outdoor models |
| IP rating | IP65 / IP66 (in combination with the protection type) |
| Cable entry | Explosion-proof cable glands / explosion-proof sealing fittings — quantity and location built to drawing |
| Qualifications | Manufactured and supplied in joint supply with an Ex-qualified manufacturer; Ex certificate available for verification |
| Application | Power distribution / control / metering in hazardous areas, configured to explosion-proof requirements |
|---|---|
| Rated voltage | AC 380V / 400V or DC, depending on application |
| Component configuration | Explosion-proof breakers, contactors, relays and terminals assembled to explosion-proof requirements |
| Explosion-proof rating | Ex d / Ex e / Ex p, gas group IIA / IIB / IIC, temperature class T1–T6 |
| Circuit configuration | Number of circuits, components, incoming and outgoing lines customized to project and explosion-proof requirements |
| Grounding | Explosion-proof grounding requirements, grounding continuity testing |
| Flameproof distribution box | Ex d flameproof, power distribution in hazardous areas |
|---|---|
| Increased safety distribution box | Ex e increased safety, general distribution in hazardous areas |
| Pressurized distribution cabinet | Ex p pressurized, high-capacity distribution and control in hazardous areas |
| Explosion-proof control box | Start/stop control of equipment in hazardous areas |
| Explosion-proof meter box | Metering and distribution in hazardous areas |
| Explosion-proof junction box | Cable transition and termination in hazardous areas |
| Reference standards | GB/T 3836.1–.4 (explosive atmospheres) series / IEC 60079 series |
|---|---|
| Type of protection | Ex d flameproof / Ex e increased safety / Ex p pressurized, per the relevant type standard |
| Gas group | IIA / IIB / IIC, temperature class T1–T6 |
| IP rating | GB 4208 / IEC 60529, IP65 / IP66 |
| Certification verification | Ex certificate available for verification; certification documents shipped with the goods |
| Factory tests | Explosion-proof construction inspection, circuit inspection, insulation withstand voltage, grounding continuity, powered functional test |
| Documents with shipment | Electrical schematic, Ex certificate (for verification), BOM, test report, factory photos |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
Select the protection type by hazardous area
Ex d, Ex e and Ex p each suit different situations — select by hazardous area, gas group and temperature class. Pick the wrong type and you either fall short on protection or pay for more than you need.
Joint supply with a specialized manufacturer
Explosion-proof products are manufactured and supplied in joint supply with a specialized manufacturer holding Ex qualifications. Ex certificates are available for verification, and qualification documents ship with the order.
Flameproof joint surface precision
The joint surface precision of an Ex d flameproof enclosure is critical — get it wrong and the flameproof capability is lost. This is the hard-won expertise of a specialized explosion-proof manufacturer.
Cable entry via explosion-proof glands
Incoming and outgoing cables use explosion-proof cable glands / sealing fittings — no plain drilled holes. The cable entry is often the weak point of an explosion-proof box.
Clear explosion-proof marking
The explosion-proof marking, gas group and temperature class are clearly marked on the nameplate. This is a basic requirement for explosion-proof products and the basis for verification.
Custom-built to explosion-proof requirements
Circuit count, components and cable entries are all custom-built to project and explosion-proof requirements. Explosion-proof boxes have no off-the-shelf configuration — every one is built to the hazardous area.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Oil & Gas / Petrochemical
Power distribution for explosive gas atmospheres in refining, storage and transport, fuel stations and similar facilities.
Pharma & Fine Chemicals
Power distribution and control for flammable solvent and dust environments.
Gas & Energy
Power distribution for hazardous areas such as gas stations and LNG facilities.
Dust environment
Dust hazardous areas such as flour, wood dust and metal dust.
Mining
Power distribution for underground and surface hazardous areas.
Coatings & Spray Finishing
Explosion-proof power distribution and control for spray booths.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Component brands | Schneider / ABB / Siemens / Chint |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
What is the difference between an explosion-proof distribution box and a standard distribution box?
Explosion-proof type design: flameproof (Ex d) contains an internal explosion through enclosure strength, increased safety (Ex e) adds safety margin, and pressurized (Ex p) isolates by maintaining positive pressure. There is also a qualification threshold — explosion-proof products require an explosion-proof certificate. Using a standard distribution box in a hazardous environment is a safety risk.
Do you hold explosion-proof certification yourselves?
Our explosion-proof products are manufactured in joint supply with an Ex-qualified manufacturer. The explosion-proof certificate is available for verification, and qualification documents ship with the goods. We will not pass off an uncertified box as an explosion-proof box.
How do you determine which explosion-proof type is required?
It depends on the hazardous area, gas group and temperature class. Zone 1 typically calls for Ex d or Ex e; Zone 2 can use Ex e or Ex p. The specific type is set by the site's area classification. Send us the environment details and application, and we will help confirm.
Can an explosion-proof box handle control functions?
Yes. Explosion-proof control boxes handle start/stop control of equipment in hazardous areas, with explosion-proof handles and indicator lights. Power distribution, control, metering and wiring are all available.
Can an outdoor hazardous environment have both explosion-proof and weatherproof protection?
Yes. Explosion-proof type combined with IP65/IP66 protection, plus weather-resistant and anti-corrosion treatment for outdoor use. Explosion protection and ingress protection are two separate dimensions, and both must be done right.
What do you need for a quote?
Hazardous area classification, gas group, temperature class, application, number of circuits and component requirements, installation environment. An area classification drawing is preferred; if you do not have one, we will confirm the solution from your description.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
Need power distribution in a hazardous area? Confirm the explosion-proof type and certification first
Send us your hazardous area classification, gas group and application for a free explosion-proof box solution · quote within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.