Figure 3-22 Networking mode
3.5 Surge Protection and Grounding System
3.5.1 Surge Protection Solution
The Smart Module is mainly used for building equipment rooms. Its power
distribution system is a subsystem of the building power distribution system. Class
I surge protective devices (SPDs) of the power system are provided by the general
low-voltage power distribution room or cabinet of the building.
3.5.2 Grounding Solution
Cabinet Potential Grounding
A general ground bar is installed in the cabinet. Ground terminals of the cabinet
are connected to the ground bar using a ground cable with a minimum cross-
sectional area of 16 mm
2
.
The AC input power is from the upstream power distribution system. The cross-sectional
areas of ground cables are determined according to IEC 60364-5-54.
Cabinet Grounding
● Metal components and parts of cabinets are properly connected. A structural
connection area is protected and applied with antioxidants. An area protected
with painting should ensure proper metal surface contact for two connected
components. The DC resistance is within 0.1 ohm between any two connected
metal components. Use a ground cable to connect two metal components
FusionModule500 Smart Mini Data Center
User Manual (Philippines, FusionModule500-
SU61A12S) 3 System Architecture
Issue 02 (2021-06-30) Copyright © Huawei Technologies Co., Ltd. 51
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