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3.2.2. Power supply and wiring preparation of the UPS system

CAUTION

For maintenance bypass installation, dual-feed input protected by an upstream circuit

breaker or single-feed input protected by two upstream circuit breakers shall be adopted.

Wherein, one is for UPS/rectier input breaker (if installed), and the other is for the

maintenance bypass input. It’s forbidden to merely employ single-feed and single-breaker

protection for UPS/rectier input and maintenance bypass. If the UPS adopts single feeder

line and a bypass input breaker is mounted on the maintenance bypass, maintenance

bypass single-feed input is allowed, and power can be supplied to the UPS and bypass

simultaneously.

As for the actual conguration of external wiring, please refer to the local or national electrical

specications:

• To facilitate future expansion, power line and external overcurrent protection switch shall be

selected for derating under full load.

• Materials and operations for external wiring requirements shall be supplied and performed by

designated personnel.

• External wiring shall adopt the copper wire capable of withstanding 105

℃

. Please see

relevant information in

Table 3-3

. The wire size depends on the circuit breaker.

• If the operation temperature of conductor is above 40

℃

, it’s necessary to use the wire that is

thicker or capable of withstanding higher temperatures.

• The wiring specications are dened by copper wire at 105

℃

4-wire system:

• The input adopts three live wires and an N wire, in addition to a grounding conductor

(protective grounding conductor). To ensure the normal operation of the equipment, the

phase lines must be grounded in a symmetric manner (from Y-type/star-type power supply).

• Support loads with N wire.

• For UPS systems congured with a 4-Pole ATS or generator, make sure the switching of the

upstream ATS will not cause disconnection of N wire, or the input N wire disconnection is

recovered before low battery voltage alert:

• When the N wire is disconnected, all phase lines shall be disconnected as well.

The wire with appropriate size shall be used to facilitate future upgrade.

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