This is the first edition of CAN/CSA-C22.2 No. 333, Electric motors for use in hazardous locations - Protection by maintaining the concentration of flammable fluids above the UFL (upper flammable limit).

This Standard applies to electric motors operating in flammable fluids that are maintained above the upper flammable limit (UFL), and the associated control systems to monitor and maintain the fluid concentration inside the motor above the UFL for use in hazardous locations in accordance with the Canadian Electrical Code, Part I.

Notes:
1) This Standard is applicable for use only in industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation.
2) Motors can be used in a closed-loop such as in a refrigeration cycle or in an open line such as a natural gas pipeline.