atmospheres in mines susceptible to firedamp.
Approved equipment is marked according rated Class (I, II, or III), Division (1 or 2), Group (A, B, C, D, E, F, or G) and temperature code (T1 through T6). For intrinsically safe equipment the words “Intrinsically Safe” or “IS” precedes the actual approval marking.
Approved equipment is marked according to the designed protection concept (Ex i, Ex d, Ex n and etc.), the group (I, IIA, IIB, IIC, IIIA, IIIB or IIIC) and temperature code (T1 through T6). For the United States it will be preceded by approved Class and Zone.
Electrical equipment for use in hazardous areas need to be certified by an approval agency.
In North America certification is provided by
Risk, reliability and safety in process control systems.
Verifies that a product is designed to the appropriate standards according the European Machine Directive.
The National Fire Protection Association (NFPA) hazard system for chemical materials.
Critical temperatures and concentration parameters for substances like coal, zinc, uranium and more.
F-rated, T-rated and L-rated fire-stop systems.
The flash point of a chemical indicates how easy it may ignite and burn.
European hazardous area classification with zones, protection types, temperature codes and codes.
North American hazardous locations classification with classes, divisions and groups
Hazardous areas protection techniques - explosion proof, flameproof and intrinsically safe.
IP - Ingress Protection rating is used to specify the environmental protection - or electrical enclosure - of electrical equipment.
Maximum fire sprinkler protected area vs. classification and construction.
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