Symmetra MW II 1200 kW 3 × 400/230 V Installation - 990-1979E-00128
Residual Current Sense
Mains - input UPS - output
PE
N
PE
PE
PE
Bypass - input Bypass - output
L1
L3
L2
L1
L3
L2
N
L1
L3
L2
L1
L3
L2
Protective Earthing Conductor
Protective Earthing Conductor
Main Protective Earthing Terminal
External SSW-Bypass
Symmetra MW
( PDU )
Service Entrance
Main
inverter
u
uu

M

Main Protective Earthing Terminal
N
PE
PE

Q1

Q6

Q3

Q5

Earthing arrangements and protective conductors - Symmetra MW in TN-S installation

E
Suitable earth electrodewith reference to IEC 60364-5-55 § 551.4.2Residual current protective devicecan be used.
Residual Current Sense
Residual current protective device can not beused at this point.Owing to parallel return path for the fault currentWith reference to:IEC 60364-4-41 § 413.1.3.1Minimum cross-sectional areas:IEC 364-5-54 § 543.1.1
+- +-
Battery 1
Battery 2

Q7 Q8

Battery 1 Battery 2
PE
PE
Battery
rack
Battery
breaker
box

Q4

Delta
Inverter
i
i
i
Common-mode filter
Switchgear

See: IEC 60364-4-41 § 413.1.3