Flameproof type IIB is also called plane explosion-proof, with only one explosion-proof surface, and the effective use space can be rectangular or square;Flameproof type IIC is also called stop explosion-proof or thread explosion-proof, generally with two explosion-proof surfaces, and the effective use space is generally circular.

IIC explosion proof enclosures often have a cylindrical or threaded flame-path, while Group IIA and IIB enclosures have a flat flame-path. An example of an explosion proof enclosure for hydrogen applications can be seen here, made by Ex-tech Solution.

Explosion Proof Lights are typically Class I, Division 1 rated. They must prevent high voltage and amperage components from becoming an ignition source

The "T" in T5 indicates the bulb is tubular shaped, while the "5" denotes that it is five eighths of an inch in diameter. The other common lamps are the larger T8 (eight eighths inch = 1") and T12 (twelve eights inch = 1½" tubes).

In an explosion proof light fixture, any explosions that may occur are contained inside the fixture. Components in a standard lighting fixture such as the bulb, wiring, contacts and switches are exposed to the atmosphere.

Unlike regular LED vapor proof lights, these explosion proof fixtures are more heavy duty and are able to operate in environments that are exposed to combustible particles/liquids. Explosion proof vapor tight lighting comes into play when there are flammable gasses or ignitable fibers within the environment.

The first step in identifying if a light is explosion-proof is to check for certification markings. Explosion-proof lights should pass specific standards to ensure that they are safe for use in volatile environments. Some of the certifications that an explosion-proof light may have include UL, CE, CSA, and ATEX.

One of the main differences between explosion-proof and ATEX is that the former follows a set of standards and guidelines, while the latter is a legal requirement that must be met by all equipment used in explosive atmospheres in the EU

IEC 60079 Series Explosive Atmosphere Standards. The International Electrotechnical Commission (IEC) 60079 series of explosive atmosphere standards covers a wide array of important considerations when it comes to potentially explosive atmospheres.