Explosion-Proof Casting:
A totally enclosed which is constructed to withstand and explosion occur, the enclosure will prevent the ignition or explosion of the gas or vapor which may surround the motor enclosure. These motors are listed with underwtiter's laboratories.

Explosion-Proof - Hazardous Locations:
Division | - Location in which ignitable concentrations of flammable or combustible material exist and come in contact with the motor.
Division || - Location in which ignitable concentrations of flammable or combustible material exist but are contained which closed systems or containers and normally would not come in contact with the motor.

Explosion-Proof - UL Classifications:
Class | - Those in which flammable gasses or vapors are or may be present in the air in quantites sufficient to produse explosive or ignitable mixture.

Group "C" - Atmoshepres containing ethyl or ether vapors.
Group "D" - Atmoshepres containing gasonline, hexanem benzenem butane, propane, alcohols, acetone, benzol, lacquer solvent vapors, natural gas, etc.

Class || - Those which are hazardous because of the presence of combustible dust.

Group "E" - Atmoshepres containing metal dust, including aluminum, magnesium, or their commercial alloys.
Group "F" - Atmoshepres containing carbon black, charcoal or coke dust.
Group "G" - Atmoshepres containing flour, starch, grain or combustible plastics or chemical dusts.