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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
Protective Earthing Conductor
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
PE
Q1
Q6
Q3
Q5
Earthing arrangements and protective conductors - Symmetra MW in "TN-S installation"
( Legal in DK - special cases )
E
Residual current protective
device can be used.
Residual Current Sense
Residual current protective device can not be
used at this point.
Owing to parallel return path for the fault current
With reference to:
IEC 60364-4-41 § 413.1.3.1
Minimum 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
Legal in DK ( Special cases )
With reference to:
Stærkstrømsbekendtgørelsen § 551.6.3 Note
( § 551.6.3 is missing in IEC 60364-5-55 )
See: IEC 60364-4-41 § 413.1.4 and "Stærkstrømsbekendtgørelsen" § 551.6.3, Note