Grounding Requirements - Huawei FusionModule1000A Installation Manual

FusionModule1000A40 Prefabricated All-in-One Data
Center
Installation Guide



(1) Signal cable feeder window

2.4 Grounding Requirements




Issue 03 (2020-06-09)
Supported power systems:
− 380 V, 50 Hz/60 Hz, three-phase, four-wire, and PE
− 208 V, 60 Hz, three-phase, four-wire, and PE
A Class I surge protective device (SPD) with a maximum discharge current (I
kA (8/20 µs) is required for the upstream input power distribution frame (PDF) for the
FusionModule1000.
External cables of the FusionModule1000 are routed into the pre-fab. module through
the power PDB and the feeder window on the pre-fab. module. It is recommended that
external cables be buried underground.
Figure 2-3 External pre-fab. module ports
The external ground resistance of the pre-fab. module must not exceed 10 ohms, or the
equivalent radius of the ground grid is no less than 5 m.
The pre-buried ground grid must be at least 0.7 m underground. In cold areas, the ground
electrodes must be buried under the frozen layer.
A pre-fab. module can be grounded using ground lugs or ground cables.
− Ground lug method: Use a ground lug made of hot-dip zinc-coated flat steel sheet
with a cross-sectional area of 40 mm x 4 mm (1.57 in. x 0.16 in.), connect one end
of the ground lug to the pre-buried ground grid, and connect the other end to the
pre-fab. module ground point. When a ground grid is pre-buried, the ground lug
must be long enough to connect to a ground point on the pre-fab. module.
Ground cable method: Use a 95 mm
−
the cable to the pre-buried ground grid, and connect the other end to the pre-fab.
module ground point. When a ground cable is used, the ground cable must be routed
through a plastic-coated metal hose.
 The screw reserved at a ground point is an M12 screw.
 A pre-fab. module can be grounded in the TN-S or TN-C-S mode.
Copyright © Huawei Technologies Co., Ltd.
(2) Power PDB
2
cable as the ground cable, connect one end of
2 Site Requirements
) of 100
max
5