What do you understand by these?

Type	Safety type	Used in
1. Exd	Flame proof	-         Where sparking & arching occurs.
2. Exi	Intrinsic safety	-         Where no spark or any thermal effect.
3. Exe	Increased safety	-         Where require to eliminate of open spark.
4. Exn	Non-sparking	-         Where no arching contacts or hot surfaces.
5. Exp	Pressurized enclosure	-         Motors, instrumentation enclosures & lighting.
6. Exs	Special protection	-         Which are not specifically covered by the previous designations.