Precautionary Guidelines - 3Com 4005 Installation And Maintenance Manual

The following list shows the amount of rack space that is needed to install a
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Switch 4005 chassis in a Telco rack or a Metric rack:
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Precautionary Safety regulations stipulate that the table, shelf, or rack on which the Switch
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Guidelines 4005 rests can support at least 61.8 kg (136.5 lb), which is three times the
weight of a fully loaded Switch 4005 chassis.
To reduce the possibility of personal injury or serious damage to the chassis, use
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at least two people to install the chassis. This is especially important for rack
installations, because you must hold the chassis in place while you secure it to
the rack.
If you are installing the Switch 4005 in a rack, first ensure that the rack is
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installed properly according to the manufacturer's instructions, which may
include steps such as:
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Use the following guidelines to tighten screws to Torque Specification:
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To ensure that you tighten screws to Torque Specification, use a torque
screwdriver.
Height — 23 cm / 9 in.
The height of the chassis, allowing for some extension beyond the location
of the upper and lower unit dividing lines.
Telco Rack Unit — 5 RU
The unit of measure is 1 Rack Unit (1.75 in. or 4.45 cm).
Metric Rack Unit — 10 SU
The unit of measure is 1 System Unit (25 millimeters).
Front clearance — 8 cm / 3 in.
This is the recommended minimum space required between the front of the
chassis and another vertical surface (such as a rack door). Your cabling may
require that you leave the rack door open.
Ground the rack in accordance with the rack manufacturer's instructions.
Bolt the rack to the floor.
Make certain that the rack is properly aligned and squared. Use a framing
tool to ensure that the rack is squared.
Module faceplate screws — 1.3 in/lb (inch-pounds)
Power supplies and fan trays to the chassis — 1.3 in/lb
#10 screws for holding the chassis onto a rack — 22-25 in/lb
Location Requirements 17