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Inserting cables into the terminal box
1. Only use cable entries that are suitable for the cables.
2. Only use cable entries and cables suitable for the prevailing ambient temperature.
3. Ensure that the power cables are strain relieved when inserting them in the terminal box.
4. Carefully connect the cables and ensure a reliable protective conductor connection.
5. Tighten the glands and the elements for the strain relief with the torque specified by the
manufacturer.
6. Check the cable entries and cables to ensure that they are correctly sealed and firmly
seated.
7. Correctly close and seal threads or holes that are not being used ensuring that the IP
degree of protection is maintained. The IP degree of protection is specified on the rating
plate.
6.2.1.6
Thread sizes in terminal box Ex e and Ex d
Thread size for additional entries, e.g. PTC thermistor or heater M16x1.5 or M20x1.5.
Other thread sizes are possible as an option.
6.2.2
Minimum air clearances
After proper installation, verify that the minimum air clearances between non-insulated parts
are maintained. Be aware of any protruding wire ends.
Table 6- 2
Rms value of the alternating voltage
Values apply at an installation altitude of up to 2000 m.
When determining the required minimum air clearance, the voltage value in the table may be in-
creased by a factor of 1.1, so that the rated input voltage range is taken into account during gen-
eral use.
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
Frame size
71 ... 90
100 ... 132
160 ... 180
200 ... 225
250 ... 315
355
Minimum air clearance dependent on rms value of the alternating voltage
U
rms
≤ 500 V
≤ 630 V
≤ 1000 V
Threaded entry
Size
M 16 x 1.5
M 25 x 1.5
M 32x1.5
M 40x1.5
M 50x1.5
M63x1.5
M 80x2
Minimum air clearance
Ex d
6 mm
8 mm
Electrical connection
6.2 Connecting the machine
Quantity
1
2
2
2
2
2
U
rms
Ex e
8 mm
10 mm
14 mm
69
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