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Figure 8-2 Multi-power Safety Protection
Caution: Shock Hazard! Disconnect all power supply cords before servicing.
8.10
Power Supply Requirements
8.10.1
AC Power Supply Requirement
An AC power supply that consists of mains supply, uninterruptible power supply
(UPS), and self-supplied electric generator set can be used as an integrated power
supply. The AC power supply must feature simple connection line, safe operation,
flexible scheduling, and easy maintenance in addition to meeting the requirements
of site load. Low voltage power supply should adopt three-phase five-wire mode
or monophase three-wire mode.
AC power supply system should work under nominal voltage and rated frequency.
Table 8-11 Nominal Voltage and Rated Frequency
Nominal Voltage
Rated Frequency
110 V, 208 V
60 Hz
220 V, 380 V
50 Hz
A UPS is typically used as an AC potential power of network products. A UPS should
be in the same phase as the mains supply. The time used for switching between the
UPS and the mains supply should be less than 8 ms. Otherwise, the server will
reboot or reset.
8.10.2
DC Power Supply Requirement
DC power supply system should work under nominal voltage of -48 V, 270 V and
380 V.
8.10.3
Recommendations on the AC Power Supply
Recommendations on the AC power supply are as follows:
Use a voltage stabilizer or voltage-regulator to respond to unstable voltages.
Use a voltage-regulator in the following situations:
