Explosion Proof Distribution Box

An explosion-proof distribution box is a complete distribution unit designed to house switches, instruments and other equipment in a centralised manner, preventing explosions at the installation site caused by sparks, arcs or high temperatures. Currently, this unit has become an indispensable distribution facility in flammable and explosive environments such as the petrochemical industry.

Based on their explosion-proof design, explosion-proof electrical equipment is primarily classified into flameproof, increased safety, intrinsically safe and positive pressure types. The structure primarily consists of the enclosure and cover, busbar box and cable outlet box, switch knobs, mounting slots, high-breaking-capacity miniature circuit breakers and drive shafts. As explosion-proof distribution boxes are used in harsh environments—particularly those installed outdoors, which are exposed to the elements year-round—the enclosure is typically made of cast aluminium alloy.

The working principle of positive pressure explosion-proof technology in explosion-proof distribution boxes: A distribution box that may possess ignition energy or lacks explosion-proof certification is placed within a positive pressure chamber. A positive pressure ventilation system then fills the chamber with a protective gas, whilst a differential pressure detection system continuously monitors the internal pressure of the distribution box. This ensures that the internal pressure remains higher than the surrounding atmosphere at all times, preventing explosive mixtures from entering the enclosure. Consequently, ignition sources within the distribution box are isolated from flammable gases in the surrounding environment, thereby achieving overall explosion protection for the distribution box.

In the future, explosion-proof distribution boxes will evolve towards greater intelligence, energy efficiency, safety and connectivity. Firstly, the equipment will integrate intelligent control systems, utilising the Internet of Things (IoT), big data and artificial intelligence to enable remote monitoring, fault prediction and automatic handling, thereby enhancing efficiency and safety. Secondly, technology will place greater emphasis on energy efficiency management, utilising energy-saving materials, LED lighting and intelligent dimming to reduce energy consumption and meet green manufacturing requirements.

At the same time, safety performance will continue to improve, with enhanced resistance to electromagnetic interference, fire resistance ratings and environmental adaptability to meet the demands of high-risk industries. Finally, with the development of cloud computing and 5G, explosion-proof distribution boxes will integrate more effectively into the Industrial Internet, enabling efficient coordination between devices and remote operation and maintenance.

Main Categories of Explosion Proof Distribution Boxes

Explosion-proof distribution boxes are categorised as follows: explosion-proof lighting boxes, explosion-proof power distribution boxes, explosion-proof control boxes, explosion-proof control cabinets, explosion-proof distribution cabinets, explosion-proof operating boxes, explosion-proof enclosures, explosion-proof starter boxes, explosion-proof motor starters, explosion-proof soft starters, explosion-proof variable frequency drives, explosion-proof star-delta starter boxes, explosion-proof autotransformer step-down starter boxes, explosion-proof magnetic starters, explosion-proof power socket boxes, portable explosion-proof enclosures, and BMG explosion-proof distribution boxes, amongst others.

Design Standards and Technical Specifications for Explosion Proof Distribution Boxes

Material Selection Standards

As critical electrical equipment for use in special environments, the choice of materials for explosion-proof distribution boxes directly affects the safety and service life of the equipment. For the enclosure and internal components, priority should be given to metal materials with corrosion-resistant and high-temperature-resistant properties; 304 stainless steel or 6061 aluminium alloy are recommended. These two materials not only meet mechanical strength requirements but also exhibit significantly superior oxidation resistance compared to ordinary carbon steel. Specialised explosion-proof cable glands must be fitted at cable entry and exit points. These components should be made of polyurethane composite or fluororubber to ensure elasticity and sealing integrity within a temperature range of -40°C to 120°C.

Structural Design Specifications

The enclosure’s structural design must meet multiple protection requirements: Firstly, double-layer silicone sealing strips should be installed at the enclosure joints, in conjunction with stainless steel anti-loosening bolts, to ensure compliance with IP65 protection rating. Secondly, the wall thickness of the enclosure should be designed according to its volume; typically, enclosures under 20 litres use 2 mm sheet metal, whilst those between 20 and 100 litres use 3 mm sheet metal, with additional internal stiffening ribs. The heat dissipation system design must follow thermodynamic principles; it is recommended to install aluminium heat dissipation fins on non-explosion-proof surfaces, along with explosion-proof axial fans that automatically start and stop based on internal temperature sensors.

Explosion-proof System Configuration

The selection of electrical components must comply with GB3836.1-2010 General Requirements for Equipment for Use in Explosive Atmospheres. It is recommended to use an Exd IIB T4 explosion-proof circuit breaker for the main switch, and Exe II T3 explosion-proof fuses for branch protection. The cable connection system should be equipped with triple protection: an outer layer of stainless steel braided conduit, a middle layer filled with explosion-proof sealing compound, and an inner layer comprising copper explosion-proof cable glands. In particular, at the transition between the enclosure and the cable duct, a labyrinth-type explosion-proof structure must be installed to ensure that explosion pressure can be safely released through pre-set pressure relief channels.

Intelligent Monitoring System

Modern explosion-proof distribution boxes should incorporate intelligent monitoring modules, including but not limited to: a remote monitoring unit based on the MODBUS protocol, capable of collecting parameters such as internal temperature, humidity and insulation resistance in real time; a GSM text message alarm module, which automatically triggers an alarm when a leakage current exceeding 30 mA or a box temperature exceeding 70°C is detected; it is recommended to install an arc flash protection device utilising ultraviolet detection technology, capable of disconnecting the faulty circuit within 5 ms. All monitoring data should be uploaded to the central control system via an intrinsically safe RS485 interface.

Comprehensive Protection Measures

The safety protection system must establish a multi-level protection mechanism: the first level involves controlling the surface resistance of the enclosure’s electrostatic conductive coating to below 10⁶ Ω; The second level involves the installation of Class I, Category C surge protectors with a current-carrying capacity of no less than 40 kA; the third level involves the installation of a thermal aerosol automatic fire extinguishing system, with the activation temperature threshold set at 150°C.

The earthing system shall be made of tin-plated copper, with an earth resistance value not exceeding 4 Ω, and all metal components must be reliably connected via equipotential bonding terminals. In areas prone to frequent lightning strikes, early-discharge lightning rods shall also be installed, with a protection radius covering the entire switchgear area.

These technical specifications have been drawn up with reference to the IEC 60079 series of international standards and the GB 12476 national standard; during implementation, differentiated designs must be adopted in accordance with the classification of hazardous areas (Zone 0, Zone 1, Zone 2) at the specific site. For special industries such as chemicals and petroleum, industry-specific safety certification requirements, such as ATEX or UL certification, must also be met. All design changes must undergo a special review by the Safety Assessment Committee for Electrical Equipment in Explosive Atmospheres.

Amasly Light FAQ

Q1.Can I have a sample order for led light ?

A: Yes, we welcome sample order to test and check quality. Mixed samples are acceptable.

Q2.What about the lead time?

A: Sample needs 3-5 days, mass production time needs 1-2 weeks.

Q3.Do you have any MOQ limit for led light order?

A: Low MOQ 1pc for sample checking is available.

Q4. How do you ship the goods and how long does it take to arrive?

A: We usually ship by DHL, UPS, FedEx or TNT. It usually takes 3-5 days to arrive. Air line and sea shipping also optional.

Q5. How to proceed an order for led light ?

A:

Firstly let us know your requirements or application.

Secondly, we quote according to your requirements or our suggestions.

Thirdly, customer confirms the samples and places deposit for formal order.

Fourthly, We arrange the production.

Q6.Is It ok to print my LOGO on led light product ?

A: Yes.Please inform us formally before our production and confirm the design firstly based on our sample.

Q7: Do you offer guarantee for the products?

A: Yes, we offer 2-5 years warranty to our products.

Q8: How to deal with the faulty?

A:

Firstly, Our products are produce dinstrict quality control system and the defective rate will be less than 0.2%

Secondly, during the guarantee period, we will provide parts to replace the bad part.. For bulk orders, we will provide vulnerable parts advance, or we can discuss solutions including recalls based on the actual situation.

Q9: Can we make low-voltage explosion-proof lamps with AC/DC voltages of 12V, 24V, 36V, or 48V?

Amasly can be used as both low-voltage and high-voltage explosion-proof lights – AC/DC 12V, 24V, 36V, 48V, AC 85-265V, AC 380V.

Q10: Can Explosion Poof Lights emergency batteries be added?

The Amasly explosion-proof lamp can be equipped with emergency lithium batteries. The emergency duration is 90 minutes, 120 minutes, or 180 minutes.

Q11: Can the Amasly explosion-proof lamp be customized as an OEM product?

Amasly explosion-proof lamps can be customized according to customer requirements for both the lamps and the packaging cartons.

Related Products