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MOTOR INFORMATION
REFERENCE INFORMATION
© FANTECH
2016
O-6
O
MOTORS FOR HAZARDOUS AREAS (Cont.)
TEMPERATURE CLASSIFICATION
Hot surfaces can cause auto ignition of gases, vapours and dust, therefore it is
necessary to ensure that the maximum surface temperature of equipment introduced
into a hazardous area does not exceed the auto ignition temperature for the gas,
vapour or dust in the hazardous area.
Group I - Maximum Surface Temperature 150°C
Group II - are given a Temperature Class (T) based on the maximum surface
temperature of the equipment.
Temperature Classes are:-
T1 - 450°C
T4 - 135°C
T2 - 300°C
T5 - 100°C
T3 - 200°C
T6 - 85°C
ExtD motors will have a maximum permisseble surface temperature rating, but do not
follow the above temperature classes.
Note: For Ex d flameproof apparatus the external surface is the measured surface. For
other types of protection (e.g. Ex e) internal surfaces are of equal importance if the
explosive atmosphere has access to them.
FLAMEPROOF MOTORS
Ex d, FOR INDUSTRIAL USE
Three-phase motors
These motors are certified to Ex d and can fit a wide range of products as shown
throughout the catalogue. The certificate covers gas groups IIA and IIB, temperature
classification T4 and enclosure protection IP66.
The Standards complied with are IEC 60079-0:2004 and IEC 60079-1: 2007-04.
Single-phase motors
Fans with single-phase Ex d motors are featured on pages
A-26/27 & B-32/33
.
The certificate covers gas groups IIA, IIB and IIC, temperature classification T6 and
enclosure protection IP66.
The Standards complied with are IEC 60079-0:2004 and IEC 60079-1: 2007-04.
EXPLOSION PROOF MOTORS
Ex e, INCREASED SAFETY
Standard three-phase motors
These motors are certified to Ex e and can fit a wide range of products as shown
throughout the catalogue. The certificate covers gas groups IIA, IIB and IIC,
temperature classification T3 and enclosure protection IP55.
The Standards complied with are IEC 60079-0:2004 and IEC 60079-7:2006-07.
This Standard means the motors are also suitable for Ex n applications.
ELECTRICAL AND MECHANICAL
SPECIFICATION
Voltage:
Up to 500 Volts
Insulation:
Class ‘F’
Enclosure:
Totally enclosed, fan-cooled
Degree of Protection:
Up to IP66
Frequency:
50 or 60 Hz
LIMITING TEMPERATURE
The temperature of an external or internal surface to which the surrounding atmosphere
has access, shall not exceed the LIMITING TEMPERATURE specified.
RANGE
It is possible variations will arise in the kW/frame size/rpm, from one manufacturer to
another from that normally referred to in normal motor standards.