Siemens SINAMICS G120 Hardware Installation Manual page 40

Connection
5.2 Requirements for the protective conductor
The minimum cross-section of the protective conductor
of the line or motor feeder cable:
• Line or motor feeder cable ≤ 16 mm
⇒ Minimum cross-section of the protective conductor = cross-section of the line or motor
feeder cable
• 16 mm² < line or motor feeder cable ≤ 35 mm
⇒ Minimum cross-section of the protective conductor = 16 mm
• Line or motor feeder cable > 35 mm
⇒ Minimum cross-section of the protective conductor = ½ cross-section of the line or motor
feeder cable
Additional requirements placed on the protective conductor
• For permanent connection, the protective conductor must fulfill at least one of the following
conditions:
– The protective conductor is routed so that it is protected against damage along its
– As a conductor of a multi-conductor cable, the protective conductor has a cross-section ≥
– For an individual conductor, the protective conductor has a cross-section ≥ 10 mm² Cu.
– The protective conductor consists of 2 individual conductors with the same cross-section.
• When connecting a multi-core cable using an industrial plug connector according to
EN 60309, the protective conductor must have a cross-section of ≥ 2.5 mm² Cu.
• Observe the local regulations for protective conductors subject to a high leakage current at
the installation site.
38
complete length.
Cables routed inside switch cabinets or enclosed machine housings are considered to be
adequately protected against mechanical damage.
2.5 mm² Cu.
① ④
...
2
2
2
①
Hardware Installation Manual, 04/2021, A5E36265179B-AB
depends on the cross-section
2
according to IEC 60204-1:
PM250 Power Module