Siemens SINAMICS G115D Operating Instructions Manual page 51

Dimensioning the protective conductor
The figure below takes the SINAMICS G115D Wall Mounted drive as an example.
①
②
③
④
The minimum cross-section of the protective conductor ① ... ③ depends on the cross-section
of the mains supply cable and the minimum cross-section of the protective conductor ④
depends on the cross-section of the motor cable:
• Mains supply or motor cable ≤ 16 mm
⇒ Minimum cross-section of the protective conductor = cross-section of the mains supply
or motor cable
Additional requirements placed on the protective conductor ①:
• 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
– The protective conductor consists of two individual conductors with the same cross-
• When connecting a multi-conductor cable using an industrial plug connector according to
EN 60309, the protective conductor must have a cross-section of ≥ 2.5 mm² Cu.
SINAMICS G115D distributed drive
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
Protective conductor for mains supply cables
Protective conductor for converter line supply cables
Protective conductor between PE and the control cabinet
Protective conductor for motor cables
complete length.
(Cables routed inside control cabinets or enclosed machine housings are considered to
be adequately protected against mechanical damage.)
≥ 2.5 mm² Cu.
section.
4.3 Requirements for the protective conductor
2
Wiring
49