APC 208/220 User Manual download pdf (Page 28)

Smart-UPS® VT 10-40 kVA, 200/208 V, 208/220 V, 380/400/415 V24

Recommended power connection with 3-phase 3-wire (delta wiring) with one phase

grounded.

Recommended power connection with 3-phase 4-wire with neutral grounded.

Note 1: If the input utility source has delta wiring with one phase grounded, do not connect one phase of

the output delta wiring to the ground. This is to prevent any malfunction of the UPS system and the load

equipment.

Note 2: If the two input utility sources have delta wiring with one phase grounded, the two utility input

sources must have the same frequency and phase which is supplied by the same power source. This is to

prevent any malfunction of the UPS system and the load equipment.

POWER SOURCE UPS POWER DISTRIBUTION UNIT

POWER SOURCE UPS LOAD

Note 1

Note 2

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APC 208/220 User Manual Page 28