Siemens SINAMICS S220

4.15.2 Conductor cross-section for protective connections
Technical data
Select the conductor cross-section of the protective conductor corresponding to the table below.
The values are applicable if the protective conductor is manufactured out of the same metal
as the line conductors. If this is not the case, then the protective conductor cross-section
must be selected in such a way that an electrical conductivity is obtained that is at least the
same as the data listed in this table.
Table 4-20 Conductor cross-section for copper protective connections
Cross-section of the line supply cable [mm
2
] Cable cross-section of the copper protective con‐
nection [mm
2
]
Up to 16 mm
2
The same as the line supply cable
From 16 mm
2
to 35 mm
2
16 mm
2
From 35 mm
2
0.5x line supply cable
4.15.3 Protective connection concept
4.15.3.1 Protective connection via the PE busbar
Overview
Power units are connected with a protective conductor to the central PE busbar in the control
cabinet.
Application planning
4.15Protective connection and function equipotential bonding
Booksize power units
70 Equipment Manual, 09/2023, A5E53307519B AA