Siemens SIMOCODE pro C - Page 144

Description of system components
8.6 Decoupling module (DCM) for 1st generation current/voltage measuring modules (e.g. 3UF711.1AA000)
SIMOCODE pro
144 System Manual, 05/2019, A5E40507475002A/RS-AD/004
The tables below show decoupling module requirements for different grounding systems and
system configurations (star systems, delta systems, and single-phase systems):
Star networks:
Table 8- 1 Decoupling module requirements for star networks
Star configuration
Network configuration
Decoupling module
required?
Note
4-wire, star, grounded with
low impedance
No "TN-S system" according to
IEC 60364
4-wire, star, grounded with
high impedance
Yes —
3-wire, star, grounded with
low impedance
No "TN-C system" according to
IEC 60364
3-wire, star, grounded with
high impedance
Yes —
3-wire, star, with isolated
neutral
Yes "IT system" according to
IEC 60364