Transport, installation and assembly
3.11 Instructions for terminal box type 1XB1 631
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
55
Internal PE ground conductor connection
The PE ground conductor connection between the grounding terminal in the box enclosure
and the motor enclosure is made by means of the mounting screws of the terminal box. The
standard terminal box cover mounting screws are adequate as potential bonding between
the terminal box cover and terminal box itself.
The equipotential bonding between the terminal box cover and the box enclosure is provided
by means of the standard cover mounting screws. A special external ground cable is only
installed if, for example, flat seals are mounted without additional support. When performing
any installation work you must always take care to ensure that all equipotential bonding
measures remain effective.
Final checks
Please check that:
● the electrical connections in the terminal box have been made in accordance with the
specifications above and tightened to the required tightening torque.
● the air gaps between non-insulated parts are maintained:
≥ 8 mm to 500 V, ≥ 10 mm to 660 V and ≥ 14 mm to 1000 V.
Pay attention to protruding wire ends.
● the connecting cables are laid in an open arrangement, so that the cable insulation
cannot be damaged during operation.
● The machine is connected in accordance with the specified direction of rotation.
● the inside of the terminal box is clean and free of any cable pieces.
● All gaskets and seals are undamaged.
● unused openings in the terminal boxes are properly closed off.
● with U-shaped box enclosures the associated entry plate is aligned without any steps all
around and is screwed down.
● The pressure relief device (depending on the type of terminal box: either cast-in slots or
an overpressure diaphragm). Any damage may only be repaired after prior discussion
with the person responsible for the safety of the installation and only by using original
parts.
Then close the terminal box and tighten the terminal box cover screws to 22 Nm.
[ID 610.102]
3.11 Instructions for terminal box type 1XB1 631
Installation
The cable entry gland must be aligned in relation to the terminal box housing such that the
contact surface for the gasket in the terminal box cover is flat. This is the only way in which a
perfect seal can be obtained. [ID 165]
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