Siemens SINAMICS G180 - Dimensioning Mains Power Cables; RCD Circuit Breaker

Electrical connection
6.5 Line supply connection
Installation and Operating Instructions SINAMICS G180
94 Operating Instructions, 02/2019, 4BS0751-007
6.5.2
Dimensioning mains power cables
Dimensioning
● Voltage load
Use cables with at least U
0
/U = 0.6/1 kV.
● Current load
– Dimension the cable cross section according to the applicable standards, e.g.
VDE 0298.
– Determine the current of the mains power cable according to the inverter input current
which you can find on the rating plate.
– Use shielded mains power cables or cables with concentric protective earth conductor,
type NYCWY, in order to reduce EMC interference.
● Precaution against injury due to indirect contact
Use an overcurrent protection device with additional potential equalization on the motor in
order to avoid injuries due to indirect contact.
● Protective earth conductor
Due to the high leakage currents of the unit (> 3.5 mA), one or more of the following
conditions must be fulfilled for fixed connection of the protective earth conductor:
– The protective earth conductor must have a cross section of at least 10 mm
2
Cu or
16 mm
2
Al
– Automatic tripping of the power supply in the event of interruption of the protective
earth conductor
– Installation of an additional terminal for a second protective earth conductor with the
same cross section as the original protective earth conductor
6.5.3
RCD circuit breaker
WARNING
High voltages
This product can cause a direct current in the protective earth conductor. When a residual
current device (RCD) or a residual current monitor (RCM) is used for protection in the event
of direct or indirect contact, only an RCD or RCM of type B is permissible on the power
supply side of this product.