Explosion Proof Box, SUREALL Low-voltage Control Guide
Driving the state of the art innovation for power distribution and control for electrical equipment in harsh and hazardous location
Explosion proof box, also called explosion proof boxes, include but not limit to explosion proof electrical boxes, explosion proof switch, explosion proof light switch, flameproof on off switch, limit switch explosion proof, explosion proof junction box, stainless steel junction box, ex proof junction box, explosion proof panel, explosion proof panelboards, class 1 div 2 miniature circuit breaker, explosion proof enclosure, class 1 div 1 enclosure, ex enclosures, hazardous location enclosure, explosion proof receptacle, explosion proof plug, explosion proof socket, explosion proof plug and socket, explosion proof outlet.
The function of explosion proof box depend on the electrical components installed such as switch, terminal blocks, circuit breaker, buttons, indicators, plug-in contact. The safety of all electrical components are enhanced in advance and protected by flame proof aluminum alloy housing, increased safety glass reinforced plastic housing or stainless steel housing, thus any electrical arcing can be confined to prevent the explosion from conveying to outer explosive atmosphere where flammable gas, vapor or dust present. They can be used in harsh and hazardous location whose optional hazard class division can be class 1 div 1, class 1 div 2, class 2 division 1, class 2 division 2, gas group A, B, C, D, gas group C, D, dust group E, F, G, zone 1, zone 2, zone 21, zone 22, gas group IIB, gas group IIC, dust group IIIC.
In the narrow sense, explosion proof junction box means connection box are equipped with terminal blocks for branch circuit cables. Whereas, in the broad sense, explosion proof junction box means explosion proof box with many kinds of electrical components during all electrical control process from field bus to loads, explosion proof box function as explosion proof switch with built-in switch to control the power on and off for explosion proof lighting, explosion proof box function as explosion proof panel with built-in circuit breakers to distribute feeder electricity from main circuits to brand circuits, explosion proof box function as explosion proof enclosure with built-in other control devices to act certain functions , explosion proof box function as explosion proof receptacle with built-in plug-in contact through plug to connect and disconnect the power for explosion proof lighting and loads.
As for the principle to make the box explosion proof, SUREALL mainly apply for two methods, one is flame proof, the other is increased safety, you know flame proof means we put all electrical devices in the high resistance aluminum alloy housing, this housing isolate the ignition to make the explosion happen in the outer environment in hazardous location. Increased safety means all material of electrical device are made of high quality and performance metal and plastic to limit the electrical arcing exactly inside the housing without leakage.
Now we are listing some widely used actual explosion proof technology for explosion proof box as below:
> What is Ex d box?
Ex d box means the box set only have one or several sets of flame proof(Ex d) aluminum alloy housing, you can put general(non-hazardous) electrical components inside to make it explosion proof, it is widely used for simple control units in hazardous location. In case you need to install operating handle(normally buttons, switches, indicators) to control the power on and off for built-in components on the housing cover surface, the thread of handle and c hubs on the housing cover should be flame proof(Ex d).
> What is Ex de box?
There are two types Ex de box as below:
Ex de box means the box set only have one or several sets of flame proof aluminum alloy housing, you can put increased safety(Ex e) electrical components inside to make it explosion proof, this kind of combination for flame proof(Ex d) housing and increased safety(Ex e) electrical components conclude Ex de box, it is widely used for complicated control units in hazardous location.
Ex de box also means the box set do not only have at least one set of flame proof(Ex d) aluminum alloy housing with increased safety(Ex e) electrical components, but also at least one set of increased safety(Ex e) housing (normally glass reinforced plastic or stainless steel material) with built-in increased safety(Ex e) components(normally terminal blocks), this kind of combination for flame proof(Ex d) housing and increased safety(Ex e) housing conclude Ex de box, it is widely used for extra complicated control units in hazardous location.
> What is Ex ed box?
Ex ed box means the box set have only one or several sets of increased safety(Ex e) housing (normally glass reinforced plastic or stainless steel material), you can put flame proof(Ex d) electrical components inside the housing, this kind of combination for increased safety(Ex e) housing and flame proof(Ex d) electrical components conclude Ex ed box, it is widely used for complicated control units in hazardous location and high corrosive environment.
|Ex d Housing
|Ex e Housing
|Ex d box
|Ex de box
|Ex ed box
SUREALL sophisticated understanding for explosion proof standard for explosion proof box，strict seasoned practical experience combined with scientific theory to make technological breakthrough and innovation
SUREALL concentrate on details and strive to perfection for stable and safe performance for explosion proof box abide by craftsmanship spirit to polish functional impeccable competitive products.
SUREALL custom-made configuration through rigorous patented technology for explosion proof box and electrical components to maximize the inner space for connection and tamp the safety foundation.
SUREALL harsh tests for every critical electrical parameters in global recognized lab for every explosion proof box with EU-ATEX certificated.
Explosion proof box is classified designed enclosure widely used in class 1, class 2, div 1 and div 1, zone 1 and zone 2 hazardous location, it features the electrical functions based on the built-in electrical components through explosion proof protected housing to improve the safety, you can read the article "What is an explosion proof junction box?"
Explosion proof equipment is the joint name for many explosion proof electrical equipment including explosion proof lighting, explosion proof switch, explosion proof junction box, explosion proof panel, explosion proof receptacle, and non-electrical equipment such as explosion proof motor, explosion proof pump, you can read the article "What is ATEX electrical equipment?"
Ex enclosure, also called explosion proof enclosure, is made of metal or plastic material to hold electrical components inside to pack the electrical explosion without transmitting to the surrounding hazardous location, the hazard class division can be class 1 div 1, class 1 div 2, zone1 and zone 2, you can check the article "What is explosion proof enclosure?" for more.
Ex e means increased safety explosion proof technology, Ex d means flame proof explosion proof technology. Increased safety is ensured through using better insulation electrical material and maximize the electrical creep distance inside a factory sealed enclosure. Flame proof is treated by using impact resistance flame proof housing with designed flame path for explosion energy to escape to insignificant condition outside the housing, you can check the article "What is Ex d?" and "What is Ex e?"
No, IP65 is not explosion proof, but explosion proof normally is IP65. IP means international ingress protection to rate the water tight and dust tight degree, IP65 rating housing can be widely used in industrial wet, dusty condition without entering into the housing, whereas explosion proof housing can be used in not only wet, dusty condition but also hazardous location.
NEMA means the ingress protection rating standard for electrical products in USA, NEMA 4X enclosure is water proof, dust proof and corrosive resistance enclosure indoor or outdoor, since the explosion proof electrical products are used in damp, dusty, even corrosive environment, SUREALL all explosion proof enclosure can reach at least NEMA 4X and up.
No, flameproof is not same as explosion proof, instead, explosion proof include flameproof because explosion proof is the umbrella name of flame proof Ex d, increased safety Ex e, intrinsic safety Ex i, etc.. But flame proof is the most critical and common type which isolate the ignition and explosion in enclosed housing to protect the project site, you can check the article "What is Ex d?"
Yes, Ex e is explosion proof, Ex e is increased safety type among all explosion proof technology applying for extra safety measure to reduce the electrical arcing to increase the safety degree based on general safety electrical components, you can check the article "What is Ex e?"
Mainly flame proof Ex d enclosure, combination of flame proof and increased safety Ex de enclosure is suitable for use in Class I hazardous locations based on NEC500 standard and UL844 standard in USA, some special pressurized Ex p enclosure is also suitable with higher gas pressure than international standard atmosphere when filled with inert gas.
Class 2 enclosure is explosion proof enclosure used in class 2 hazardous location where flammable dust may present. The enclosure can resist the dust explosion pressure and cut off the explosion spreading to outer enclosure or can limit the heat energy for over-current and short-circuit of electrical circuits to avoid the dust explosion inside the enclosure.
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