Guides For Explosion Proof Lighting
Now we are offering you some simple way to select proper explosion proof products as below:
Gas or Vapor
Class I, Division 1
Class I, Division 2
Class II, Division 1
Class II, Division 2
There are three factors will make it possible for a real explosion, even through we can take some measures to avoid the formation of explosive atmospheres, the leaked combustible substance still present probably, so Combustible substances, such as gas, vapor, mist and dust may exist, besides, we are impossible to avoid Air (oxygen) in any environment, so what we can only do to avoid explosion is only to control Ignition source.
Since there inherently exists electrical power for all electrical products used in oil and gas projects. The electrical circuit may probably produce high temperature, electrical sparks and even visible fire in case of short circuit, over-current and any other failure of the whole circuit, in that case, the electrical circuit will become Ignition source to make it possible for a real explosion.
Thus, we must use explosion proof products to avoid the formation for the Ignition Source to ensure the safety.
Hazardous locations are classified into different Group/Class, Zones/Divisions depending on the composition and presence frequency of flammable substances.
Flammable substances are classified into different groups depending on how easy the exact flammable substances could be ignited.
Classifications for Temperature
Explosive temperature is the highest temperature of a surface of an explosion-proof electrical products when this explosion-proof electrical products work normally. As we know, explosion-proof electrical products is still an electrical products which will produce heat when normal operated, but if the temperature of surface of explosion-proof electrical products is higher than spontaneous ignition temperature of the outside combustible gas or dust, this electrical products will ignite the combustible gas or dust outside the enclosure directly, in a word, explosion-proof electrical products have become an ignition source itself even electrical circuits inside the enclosure are explosion-proof type. So the temperature group may be classified into different groups.
Note: When we intended to install an explosion-proof electrical products in an gas or dust atmosphere where the spontaneous ignition temperature is 100℃(T5), so we could exactly install explosion-proof electrical products whose temperature group is 85℃(T6) but we could not install explosion-proof electrical products whose temperature group is 135℃(T4).
In a word, as for temperature group of explosion-proof electrical products, the lower, the better! because lower temperature group could be used for wider scope of combustible gas or dust.
Want to Get High-quality LED lighting, explosion proof lighting and other explosion-proof fittings? Welcome to SUREALL