375 / 416
MOTOR INFORMATION
© FANTECH
2016
REFERENCE INFORMATION
O-5
O
MOTORS FOR HAZARDOUS AREAS
TYPES OF MOTORS
The following are the main groups of motors used in hazardous locations, but not all
situations are covered. Should you have an application not covered by the following,
please refer to one of our sales offices.
O
Ex d
flameproof motors
O
Ex e
increased safety motors
O
Ex nA non-sparking motors
O
Ex tD dust ignition protection motors
COMPLIANCE TO STANDARDS
All motors suitable for use in hazardous areas are manufactured/modified in strict
accordance with the conditions required by the relevant standards and the issued
Certificate of Compliance, and are fully tested prior to despatch by the manufacturer.
SELECTION OF MOTORS FOR
USE IN HAZARDOUS AREAS
There are a number of defined hazardous areas covering gases and dusts. It is
therefore strongly recommended that the relevant Australian Standards and Statutory
Authorities be consulted prior to final selection of the motor.
HAZARDOUS AREAS
Many gases, vapours and dusts or fibres which are generated, processed, handled
and stored in industry are combustible. When ignited they may burn rapidly and with
considerable explosive force if mixed with air in the appropriate proportions.
Areas where gases, vapours, dusts and fibres occur in dangerous quantities are
classified as HAZARDOUS.
The relevant groupings are :-
O
a) Group I: electrical equipment for mines susceptible to firedamp
O
b) Group II: electrical equipment for places with an explosive gas atmosphere,
other than mines susceptible to firedamp
O
c) Group III: electrical equipment for places with an explosive dust atmosphere
With Group II gases, they are further subdivided into sub-groups IIA, IIB, IIC,
depending upon the ignition point of the gas.
ZONAL CLASSIFICATION is also required where explosive atmospheres are present and
they indicate the probability of the presence of a flammable, combustible or explosive
material, the extent, dimension and shape of the hazardous areas, together with
the volume in which the hazardous material can be expected. There are three zones
for each:-
Gases and Vapours
O
ZONE 0 - place in which an explosive atmosphere consisting of a mixture with
air of flammable substances in the form of gas, vapour or mist is
present continuously or for long periods or frequently.
O
ZONE 1 - place in which an explosive atmosphere consisting of a mixture with
air of flammable substances in the form of gas, vapour or mist is
likely to occur in normal operation occasionally.
O
ZONE 2 - place in which an explosive atmosphere consisting of a mixture with
air of flammable substances in the form of gas, vapour or mist is
not likely to occur in normal operation but, if it does occur,
will persist for a short period only.
Dusts
O
ZONE 20 -area in which an explosive atmosphere in the form of a cloud of
combustible dust in air is present continuously, or for long periods
or frequently.
O
ZONE 21 - area in which an explosive atmosphere in the form of a cloud of
combustible dust in air is likely to occur, occasionally, in normal
operation.
O
ZONE 22 - area in which an explosive atmosphere in the form of a cloud of
combustible dust in air is not likely to occur in normal operation
but, if it does occur, will persist for a short period only.