Toshiba G8000 Series Installation Manual page 40

11.6.4 Grounding configuration with corner-grounded delta-input
If a phase of delta-input source is grounded (B-phase for example), the ground bus in the UPS cabinet
should NOT be connected to the neutral terminal of UPS output. So, the jumper cable should be
disconnected. See Figure 11.9 for the jumper cable location.
The UPS output is floating against ground during normal operation. An isolation transformer is
recommended at output distribution as shown in Figure 11.12.
Input Source
3
B
3
G
Figure 11.12 - Grounding configuration with corner-grounded delta-input.
< UPS Cabinet >
3
N
3
G
39
Output Distribution
3
N
3
N
G
G
Disconnect
The Cable
3
To the
Load