Toshiba G8000 Series installation manual Grounding configuration with corner-grounded delta-input

11.6.4Grounding 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

	< UPS Cabinet >
3
N
3	3
	N
G	G

Output Distribution

3

3

N

To the

Load

G

Disconnect

The Cable

Figure 11.12 - Grounding configuration with corner-grounded delta-input.

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