Nord Drivesystems B1091, Operating Manual With Installation Instructions

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3 ATEX Explosion hazard areas
B 1091 en-1221 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 glands
The cable glands must be approved for explosion hazard areas. Unused openings must be sealed
with approved blind plugs. When connecting the installation cables, the connections at the motor
terminals and the ground cable with U-shaped cables must be placed below the respective terminals
so that the clamping bracket and the clamping bolt are evenly loaded and are not deformed. As an
alternative, the connections may be designed with a cable lug. If the cables are subject to increased
thermal requirements, this information can be found listed on a label on the motor.
For sizes 63 to 132, an isolated cable lug must be provided, if it is used to connect the earthing cable
within 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
The use of aluminium connection cables is not permitted.
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