-8- B1091-GB-3212 www.nord.com
5. Motors with protection type
Increased Safety Exe
These motors are subject to the following supplementary or specific information.
The motors are suitable for use in Zone 1 and conform to equipment group II, category 2G, and can be used
for an ambient temperature between -20°C and +40°C.
Type addition: 2G e.g.: 80 L/4 2G TF
The marking is
0102 II 2G Ex e II along with the temperature class
If the motor is connected to a gearbox, the Ex marking of the gearbox must also be observed.
Explosive gas mixtures or concentrations of dust in conjunction with hot, live and moving parts on electrical
machinery can cause serious or lethal injuries.
The increased hazard in explosive areas calls for particularly careful compliance with the general safety and
commissioning instructions. The staff responsible must be trained regarding correct use of motors in
explosive areas.
Explosion-proof electrical machines comply with the standards in series EN 60034 (VDE 0530) as well as
EN 60079-0 and 60079-7. It is the degree of explosion risk which determines zone classification.
DIN EN 60079, Part 10, provides information on this. It is the user who is responsible for zone classification.
If motors are not certified for explosive areas, it is prohibited to use them in explosive areas.
Cable entries must be approved for explosive atmospheres. Ports which are not used must be closed off with
approved blind plugs.
When connecting up the installation lines to the motor terminals and the protective earth lead must be laid
with U-shaped lines under the respective terminals so that the wire clamps and the terminal studs are
subjected to uniform loading and are not deformed under any circumstances. Alternatively, the connections
can be made with a cable lug. The use of aluminium connecting cables is not permissible.
The motor is supplied with a certified cable gland. The clamping nuts of the cable gland must be tightened to
the torque specified in the following table.
Cable gland Clamping nut tightening
torque [Nm]
M20x1.5 6
M25x1.5 8
M32x1.5 12
M40x1.5 16
When connecting up always ensure that the permissible clearance distances of 10 mm and the permissible
creepage distances of 12 mm between live components and housing potential and between individual live
components are observed.
Before the terminal box is closed, make sure that all the nuts on the terminals and the screw on the
protective earth terminal are tight. The terminal box gaskets and the seals on the cable gland must be fitted
properly and must not be damaged in any way.
If the shaft end is at the top, e.g. designs IMV3 or IMV6, and the motor has Exe protection, the user/installer
must fit a cover which prevents foreign bodies from falling into the motor fan hood (see DIN EN 60079-0). It
must not impair cooling of the motor by its fan. A handwheel at the second shaft end is not permitted. If the
shaft end is at the bottom, e.g. designs IMV1 or IMV5, the motors are generally provided with a protective
roof on the fan hood. The motors are designed for continuous duty and normal, non-recurring start-ups in
which no substantial start-up heat develops.
Area A in EN 60034-1 (VDE 0530 Part 1) - voltage ± 5%, frequency ± 2%, characteristic, mains symmetry -
must be observed so that the development of heat remains within the limits permitted. Any major deviations
from the ratings can caused an impermissible increase in the development of heat in the electric machine.
The motor temperature class stated on the name plate must at least conform to the temperature class of any
combustible gas that may be emitted.
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