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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
PE
Protective Earthing Conductor
Main Protective Earthing Terminal
External SSW-Bypass
Symmetra MW
( PDU )
Service Entrance
Main
inverter
u
u
u
M
Main Protective Earthing Terminal
N
PE
Q1
Q6
Q3
Q5
Earthing arrangements and protective conductors - Symmetra MW in TT installation
E
Suitable earth electrode: R
A
x I
a
< 50V
With reference to IEC 60364-4-41 § 413.1.4.2
Residual current protective device
can be used.
Residual Current Sense
+- +-
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 § 413.1.4
With reference to IEC 60364-4-41 § 413.1.4.1
Residual current protective device can not be
used at this point.
Owing to parallel return path for the fault current