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For power cables from Siemens in which the shield is connected to the connector housing (see
relevant catalog), this is a sufficiently good shield support.
• For components that do not have any special shield connection or where the shield
connection is not adequate, you can connect the cable shields to the metal mounting plate
using hose clamps and toothed rails. Keep the cable length between the shield connection
point and the terminals for cable conductors as short as possible.
• For the 16 kW and 24 kW connecting cables of the S220 Smart Line Modules, it is permissible
to connect the shield to the strain relief plate using a hose clamp. Alternatively, you can order
an optional shield connection plate. More information is provided in Chapter "Shield
connection plate and terminal (Page 96)".
• For S120 Line Modules and Active Interface Modules up to and including 16 kW - as well as
for Motor Modules up to and including 30 A or 2x18 A - shield connection plates are either
included in the scope of supply of the components or integrated in the connection plug. You
must order shield connection plates for all other components. More information is provided
in Chapters "Shield connection plates" and "Accessories" of the SINAMICS S120 Equipment
Manual Booksize Power Units (
https://support.industry.siemens.com/cs/ww/en/view/
Routing 24 V conductors
When routing 24 V conductors, carefully observe the following additional requirements:
• A maximum of one conductor pair may be bundled together.
• You must route 24 V conductors separately away from other cables and conductors that may
carry operational current.
• Never route 24 V conductors in parallel to power cables.
• You must route 24 V conductors and power cables to components so that they never cover
the ventilation slots.
Conditions of use for 24 V conductors
• Ambient temperature: 55 °C
• Conductor limit temperature: ≤ 70 °C for operation with the rated load current
• Max. cable length: 30 m for 24 V conductors and for signal cables without additional circuitry
Overvoltage protection devices must be used for longer cable lengths.
Control cabinet design and EMC booksize
8.10 Cable shielding and routing
Booksize power units
Equipment Manual, 01/2022, 6SL3097-6AC30-0BP0
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