Grounding Requirements - Huawei FusionModule1000A20 Installation Manual

FusionModule1000A20 Prefabricated All-in-One Data
Center
Installation Guide
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(1) Feeder window

2.4 Grounding Requirements

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Issue 02 (2020-01-15)
Supported power systems: 380/400/415 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 feeder window or the bottom cable hole. It is recommended that external cables be
buried underground.
Figure 2-3 Pre-fab. module exterior 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
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(2) Bottom cable hole
2 Site Requirements
) of 100
max
5