3 ATEX Explosion hazard areas
B 1091 en-3118 23
The increased danger in explosion hazard areas requires especially strict observance of the general
safety and commissioning information. The person responsible must be qualified according to the
national and local regulations.
Explosion protected electrical machines with ignition protection class Ex eb correspond to the standard
series EN 60034 (VDE 0530), as well as EN 60079-0:2014 and EN 60079-7:2015. The degree of the
explosion hazard determines the zone categorisation. DIN EN 60079, Part 10 A provides information
with regard to this. The operator is responsible for the categorisation of the zones. The use of motors
which are not certified for explosion hazard areas in explosion hazard areas is prohibited.
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3.1.1 Cable gland
The cable glands must be approved for explosion hazard areas. Unused openings must be closed with
approved blind plugs. When connecting the installation cables, the connections to the motor terminals
and to the earth lead must use U shaped bent cables placed under the relevant terminals so that the
clamping bars and the terminal bolts are equally loaded and are not deformed in any way. Alternatively,
the connections may be made with a cable lug. If increased thermal requirements are made for the
cables, these must be obtained from the information plate on the rotor.
For Sizes 63 to 132 an insulated cable lug must be used, if this is used to connect the earth lead in the
terminal box.
The nuts of the terminal board bolts must be tightened according to the following table.
Tightening torques for terminal board connections
Thread diameter M4 M5 M6 M8
Tightening torque (Nm) 1.2 2.0 3.0 6.0
Use of aluminium connecting wires is not permitted.
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3.1.2 Cable connections
All motors with ignition protection class Ex eb are delivered with a certified cable gland.
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If the supplied cable glands are used, cables with a circular cross-section must be used. The clamping
nuts of the cable gland must be tightened to the torque specified in the following table.
Clamping nut tightening torques
Cable gland M20x1.5 M25x1.5 M32x1.5 M40x1.5
Tightening torque (Nm) 5.0 5.0 10.0 13.5
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Use of reduction adapters according to Directive 94/9 EEC or 2014/34/EU and/or cable glands with
ignition protection class Ex eb is permissible. For this, a minimum certified temperature of 80°C is
necessary.
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When connecting, care must be taken that the permissible air gaps of at least 10 mm and the permissible
leakage tracks of at least12 mm between the electrically live components and components with the
same potential as the housing, or between live components are maintained.
Check that the terminal nuts and the screw for the earth lead are tight before closing the terminal box.
The terminal box seals and the seals of the cable glands must be correctly seated and must not be
damaged.
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