Dimensioning The Protective Conductor - Siemens sinamics G120 Operating Instructions Manual

4.5.2

Dimensioning the protective conductor

Danger to life caused by high leakage currents for an interrupted protective conductor
The drive components conduct a high leakage current via the protective conductor.
Touching conductive parts when the protective conductor is interrupted can result in death
or serious injury.
• Lay the protective conductor as specified.
Laying the protective conductor
①
②
Converter with CU250S-2 Control Unit
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
WARNING
For the protective conductor of the line-system connection within a machine or system, the follow-
ing applies:
1. Observe the local regulations for protective conductors subject to an increased leakage cur-
rent at the site of operation.
2. Lay the protective conductor as follows:
– For permanent connection, the protective conductor must fulfill at least one of the following
conditions:
- The protective conductor is laid so that it is protected against mechanical damage over its
complete length.
1)
- In a multi-core cable, the protective conductor core has a cross-section of ≥ 2.5 mm² Cu.
- In a single conductor, the protective conductor has a cross-section of ≥ 10 mm² Cu.
- The protective conductor consists of two conductors with the same cross-section.
– For the connection of 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.
Cables laid within control cabinets or closed machine housings are considered to be adequately
1)
protected against mechanical damage.
The protective conductor must have at least the same cross-section as the line cable of the in-
verter.
For a cross-section of the line cable ≥ 6 mm², cross-section = 6 mm² suffices for the protective
conductor.
4.5 Connecting the line supply, motor, and inverter components
Installing
75