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34001813EN/AE - Page 17
2. Installation
2.5 2.5 System earthing arrangements
This chapter lists the main system earthing arrangements and their wiring requirements. For system earthing arrangements
which are not listed in this document, please refer to the “SEA guide” reference 34002636XT..
TNS upstream and TNS downstream installation
For separate Normal AC and Bypass AC lines from a single source.
With differential circuit breaker:
Without differential circuit breaker:
The Normal and Bypass AC lines must be galvanically isolated
Upstream differential protection rating must be at least 3A
Bypass AC
Normal AC
L1
L2
L3
L1
L2
L3
N
L1
L2
L3
N
Load
SS
UPS
PFC
INV
PE
MLVS
PE
PE
Bypass AC
Normal AC
L1
L2
L3
L1
L2
L3
N
L1
L2
L3
N
Load
PE
SS
UPS
PFC
INV
PE
MLVS
PE