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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
( Alternative to earth electrode )
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 "IT - installation"
E
Residual current protective device
can be used.
+- +-
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 § 413.1.5
Protective Earthing Conductor
Insulation
Monitoring
Device
Requirement !!
IEC 60664-4-41 § 413.1.5.4
Suitable earth electrode: R
A
x I
d
< 50V
With reference to IEC 60364-4-41 § 413.1.5.3
Alternative:
The exposed-conductive-parts can be earthed individually or in groups.
But special demands are required. See IEC 60364-4-41 § 413.1.5.5 a)
Z
Z
Grounding
impedance
Grounding
impedance