APC GALAXY 7000 - Manual (Page 24)

System earthing arrangements >
34020846EN/AD - Page 24
1. Installation
1.4 System earthing arrangements
This section lists the main SEAs (system earthing arrangements) and their wiring requirements. For SEAs not listed here,
please contact the technical-support department.
Single UPS system
TNS upstream, TNS downstream
For separate normal and bypass AC lines from a single source.
W i t h o u t r e si d u a l - c u r r e n t p r o t e c t i o n
W i t h r e s i d u a l - c u r r e n t p r o t e c t i o n
UPS units used as frequency converters: please contact your technical assistance
Galvanic isolation between the normal and bypass AC lines is mandatory.
The recommended minimum residual current protection is 3A, provided the conditions defined in IEC364.4-41 are
respected.
For a transformer on a Bypass AC network
For a transformer on a Normal AC network
Adding a transformer into the Normal AC network reduces the installation’s overall yield.
Bypass AC
Normal AC
L1
L2
L3
L1
L2
L3
N
L1
L2
L3
N
Load
PE
SS
UPS
PFC INV
PE
MLVS
PE
Bypass AC
Normal AC
L1
L2
L3
L1
L2
L3
N
L1
L2
L3
N
(4p)
Load
PE
SS
UPS
PFC INV
PE
MLVS
PE
Bypass AC
Normal AC
L1
L2
L3
L1
L2
L3
N
L1
L2
L3
N
Load
PE
SS
PFC INV
PE
MLVS
PE