Installation
3.4 Protective conductor
SINAMICS G120D converter
24 Getting Started, 07/2016, FW V4.7 SP6, A5E38556189B AA
The minimum cross-section of the protective conductor ① … ④ depends on the cross-
section of the line or motor feeder cable:
● Line or motor feeder cable ≤ 16 mm
2
⇒ Minimum cross-section of the protective conductor = cross-section of the line or motor
feeder cable
● Line feeder cable = 16 mm² … 35 mm
2
⇒ Minimum cross-section of the protective conductor = 16 mm
2
● Line feeder cable> 35 mm
2
⇒ Minimum cross-section of the protective conductor = ½ cross-section of the line or
motor feeder 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
complete length.
Cables routed inside electrical cabinets or enclosed machine housings are considered
to be adequately protected against mechanical damage.
– As a conductor of a multi-conductor cable, the protective conductor has a cross-
section ≥ 2.5 mm² Cu.
– For an individual conductor, the protective conductor has a cross-section ≥ 10 mm²
Cu.
– The protective conductor consists of two conductors with the same cross-section.
● 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.
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