Huawei OceanStor 2000 V3 Series Features Manual page 43

OceanStor V3 Series
HyperMetro Feature Guide for Block
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Issue 05 (2018-01-30)
Item Requirement
Moisture-proof If the relative humidity is greater than 70%, install the
measures dehumidifying device, such as the air conditioner with the
dehumidification function or special dehumidifier. Ensure that
the equipment room is protected from water seepage and dew.
Heating For an environment where the average daily temperature is
lower than 5°C for at least 90 days each year, heating devices
are required. For an environment where the average
temperature is lower than 5°C for 60 to 90 days each year,
heating devices are recommended.
Ventilation and To ensure smooth ventilation, the cabinet should be at least
heat dissipation 100 cm (39.4 inches) away from the walls and you should
leave a clearance of at least 120 cm (47.28 inches) between
the cabinets. To keep a convective air transfer between the
cabinet and the equipment room, no enclosed space is allowed
in the cabinet. 1 U space should be left above and below each
device.
Dust-proof For the equipment room near dust sources (such as coal
measures mines, country roads, or farmland), use double-layer
aluminum alloy windows for proper sealing and an anti-theft
and fireproof door. Separate the devices from the door with a
partition board to avoid dust.
Ground resistance Less than 10 Ω. The distance between the top of the ground
terminal and the ground should be at least 0.7 m (27.58
inches). In the cold regions, the ground terminal should be
buried under the layer of frozen earth. Periodically monitor
ground resistance to ensure ground effectiveness.
Ground lead-in The ground bar in the equipment room should be connected to
the network of ground cables. The ground lead-in should not
be longer than 30 m (98.4 feet) and should use the zinc-coated
flat steel whose cross-sectional area is equal to or more than
40 mm (1.57 inches) x 4 mm (0.157 inches). The contact point
should be handled for insulation and anticorrosive purposes.
The above-ground steel should be provided with measures to
avoid mechanical damage and should be intact without
soldering points for the break.
Lightning The equipment room must be provided with lightning
protection conductors such as the lightning rod or lightning belt. The
lightning conductors share the ground bars with the protection
ground cables of the equipment room.
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