Requirements For Branch Circuit Protection; Operation With Residual Current Protective Device (Rcd) - Siemens SINAMICS G115D Operating Instructions Manual

Wiring

4.4 Requirements for branch circuit protection

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-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.
4.4 Requirements for branch circuit protection
Requirements for UL-compliant installation
The integral solid-state short-circuit protection does not provide branch circuit protection.
Branch circuit protection must be provided in accordance with the National Electrical Code
and any additional local codes.
4.5

Operation with residual current protective device (RCD)

Fire or electric shock due to unsuitable residual-current protective devices
The converter may create a current through the protective conductor. The current through
the protective conductor can cause the residual current device (RCD) or residual current
monitor (RCM) to incorrectly trip (nuisance trip). In the case of a ground fault, the fault
current can contain a DC component, which prevents the RCD or RCM from tripping, with
the risk of subsequent fire or electric shock.
• Use the protection and monitoring devices recommended in the documentation.
Protection and monitoring equipment
To provide protection against short-circuit, use the recommended overcurrent protective
devices (fuses, circuit breakers etc.).
(https://support.industry.siemens.com/cs/ww/en/ps/27867)
54
complete length.
(Cables routed inside control cabinets or enclosed machine housings are considered to
be adequately protected against mechanical damage.)
≥ 2.5 mm² Cu.
WARNING
Branch protection and short-circuit strength according to UL and IEC
Operating Instructions, 12/2020, FW V4.7 SP13, A5E48681219B-002
SINAMICS G115D distributed drive