Assembly, Connection and Putting into Operation 45
5.2.8 Earthing the cable connections of the EK280
All cables firmly connected to the EK280 have a shield. This
is connected to the cable glands of the EK280 in order to
prevent electromagnetic interference.
Only shielded cables should be used for new connections.
The cable shield should be completely earthed on both
sides. For this purpose, the EK280 is equipped with special
cable glands.
5.2.9 Additional measures for installation in zone 2
For the installation of the EK280 model with an integrated
power supply unit (ATEX category "II 3 G") in zone 2, the
following additional measures are necessary:
– A cable-tie must be mounted on each cable inside the
housing as strain relief.
Place the cable-tie right beside the cable gland.
– All cable glands have to be fastened with minimum
- 6 Nm for metal glands
- 1.5 Nm for plastic glands
– Use only cables with the following outside-diameters for
installation of the different cable gland types
M12, metal: 4.5 mm
M16 and M20, metal: 8 mm
M16, plastic: 8 mm
The ATEX category "II 1 G" models of the EK280 (without in-built power
supply unit) should be installed in both zones 1 and 2 without these addi-
tional measures.
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