Three-phase squirrel cage induction motors in flameproof enclosure type ASA and E2-ASA
frame size 63 – 355
-
IEC
6
0079
-
3
1 –
Explosive atmospheres - Part
3
1:
Equipment dust
ignition protection
by enclosure „t”
- EN 60529 – Degrees of protection provided by enclosures (IP
Code)
- Directive 94/9/EC – Potentially explosive atmospheres (ATEX)
The motors type of protection is:
- Ex d IIC T5 Gb (alternatively Ex db IIC T5) or Ex t IIIC T100
0
C Db
(alternatively Ex tb IIIC T100
0
C)
for the frame sizes 63-71 and
- Ex d IIC T4 Gb (alternatively Ex db IIC T4) and/or Ex d e IIC T4 Gb
(alternatively Ex db eb IIC T4) or Ex t IIIC T125
0
C Db (alternatively
Ex tb IIIC T125
0
C)
for the frame sizes 80-355
They are designed to be used as:
- EPL Gb equipment and are allowed to operate in Zones 1 and Zones 2
where the risk of explosion is produced by a mixture of air with flammable
gases pertaining to Group IIC
and
- EPL Db equipment and are allowed to operate in Zones 21 and Zones 22
where the risk of explosion is produced by a mixture of air with flammable
dusts pertaining to Group IIIC
Cable entries are only suited for permanent wiring. The type of installation
shall provide for adequate strain relief.
1.1.1 Notation and symbolisation
The symbolisation of the motors type is made up of three groups of
letters and figures in the following order:
-
group ASA and/or E2-ASA represents the motors series
denomination
-
group of the mounting dimensions
-
group of poles number
Examples of notation for a motor having the stator frame size 90L, 4
poles:
Motor type ASA 90L-4
Motor type E2-ASA 90L-4
1.2
The motors are intended to operate under temperate (N) climate
conditions, characterised by:
ambient temperature: -20 ... + 40
0
C
relative humidity: 80% at + 20
0
C
altitude: max. 1000 m (above sea level)
