Emerson DL8000, Инструкция по эксплуатации

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DL8000 Preset Instruction Manual
Revised February-2016 Installation and Use 2-21
Connect this ground point to a copper ground rod as described
below.
• Connect a single-point ground (the outside case ground lug) to a
copper-clad, ten-foot long, 19 mm (0.75 inch) diameter steel rod,
which is buried, full-length, vertically, into the soil as close to
the equipment as is practical. (Grounding rod furnished by
others.)
Note
:
We recommend cad welding the wire to the rod to ensure
proper grounding.
• Resistance between the copper-clad steel ground rod and the
earth ground must not exceed 25 ohms. If necessary, additional
ground rods may be driven into the ground, while a spacing of
not less than 1.8 meters (6 feet) is used to separate each of the
ground rods. Additionally, the ground rods must be
interconnected with a continuous stranded wire, sized as
indicated below.
• When several DL8000 units are located in close proximity, each
single-point equipment ground must be inter-connected to the
single point grounds of the other DL8000s. These inter-
enclosure equipment grounding connections must be “daisy-
chained” so that only one point of the grounding daisy-chain is
connected to the actual ground rod.

Size the equipment-grounding conductors used between DL8000
units and the copper-clad steel ground rod or for inter-enclosure
equipment ground connections according to the following
specifications:
• Stranded, insulated, copper wire size AWG 8 for distances of
less than 4.5 meters (15 feet).
• Stranded, insulated, copper wire size AWG 6 for distances of 4.5
to 9 meters (15 to 30 feet).
• Stranded, insulated, copper wire size AWG 4 for distances of (9
to 30.5 meters (30 to 100 feet).
• All inter-enclosure equipment-grounding conductors should be
protected by metallic conduit.
• Shield-drain wires should be connected to ground at only one
end of the shielded conductor run.
• External equipment (such as data printers or terminal automation
systems which are connected to the DL8000) should be powered
via isolation transformers to minimize the ground loops caused
by the internally shared safety and chassis grounds.