Grounding The Metal Shield In The Terminal Box; Conductor Connection; Inserting Cables Into The Terminal Box - Siemens SIMOTICS XP 1MB5 Operating Instructions Manual

Electrical connection
6.7 Conductor connection
6.6.2

Grounding the metal shield in the terminal box

If you are using metal-armored cables that are inserted into the terminal or auxiliary terminal
boxes with non-intrinsically safe circuits, then ground the metal shield in the terminal box.
• In terminal boxes with internal grounding part, connect the metal shield to the internal
grounding point.
• In terminal boxes without internal grounding part, connect the metal shield to one of the
green-yellow ground terminals.
For explosion-protected motors, it is not permissible to use more than one grounding
location for the metal shield.
6.7

Conductor connection

The maximum conductor cross-section that can be connected is 300 mm².
6.7.1

Inserting cables into the terminal box

The connection cables are inserted into the terminal box via an exchangeable cable entry plate
or cable entry support. The cable glands are not included in the standard scope of supply.
Table 6-3
Terminal box
TB3R61
1XB1631
1XB7750
Procedure
1. Unscrew the cable entry plate.
2. Drill the required number of holes or threads in the required size in the cable entry plate.
Ensure that the cable entry plate can be assembled after drilling and that it features sufficient
stiffness.
3. Install the cable glands required, taking into account the manufacturers data relating to
installation steps - including tightening torques and the suitability for the ambient
conditions.
4. Route the cables through the cable glands - and carefully ensure that the cables and
conductors are strain relieved.
5. Fit the cable entry plate to the terminal box with the assembled cables.
To ensure compliance with the IP degree of protection, make sure that the terminal boxes
TB3R61 and 1XB1631 have a perfectly flat contact surface for the cover.
82
Cable entry plate versions
Cable entry plate with boreholes
4 x M80 x 2 + 2 x M25 x 1.5
4 x M80 x 2 + 2 x M25 x 1.5
8 x M72 x 2 + 3 x M25 x 1.5
Option R53 /
Explosion-protected motors
Undrilled
1MB5 shaft height 400/450
Operating Instructions, 04/2023, A5E52802354A