Siemens SIMOTICS XP 1MB5 SH400, Operating Instructions Manual, Page: 74 / 166

The connection cables are color-coded or labeled. The customer directly connects individual
cables in the control cabinet for their system in accordance with the labeling.
Cable glands with connecting thread in the terminal box (EN 50262)
②
O ring
6.5.5 Certified cable entries, thread adapters and sealing plugs
Use only sealing plugs, cable entries & conductor entries and thread adapters that are certified
and marked for use in the respective hazardous zone.
6.5.6 Undrilled entry plate
If the entry plate is undrilled, you should match the number and size of the cable glands to the
operating conditions.
1. Unscrew the cable entry plate.
2. Drill the required number of holes or threads in the required size into the cable entry plate.
The thickness of the plate is selected in such a way as to give a sufficient number of turns
when the holes are tapped.
Please note that you are responsible for ensuring that the entry plate still has sufficient
strength after the holes have been drilled and tapped.
3. Mount the cable entry plate and the cables with the cable glands onto the terminal box.
Requirements placed on drilled holes in Zone 21/22
For applications in Zone 21 (Ex tb) or Zone 22 (Ex tc), according to IEC / EN 60079-31, the
following requirements are placed on the bores:
Through holes:
● The nominal diameter of the through holes for the entry may not be 0.7 mm larger than the
nominal diameter of the thread of the cable entry or connection element.
● The inside of the terminal box must have sufficient space to attach a locking nut at the cable
entry or at the connection element.
Electrical connection
6.5 Connecting the machine
1MB5 SH 400/450
72
Operating Instructions, 05/2019, A5E45959221A