can greatly reduce the negative effects of dust and other particles that act as insulators and interfere with the
mechanical components in the equipment.
Corrosion
The corrosion of equipment connectors is a gradual process that can eventually lead to intermittent failures
of electrical circuits. The oil from your fingers or prolonged exposure to high temperature or humidity can
corrode the gold-plated edge connectors and pin connectors on various components in the equipment. To
prevent corrosion, avoid touching contacts on modules and protect the equipment from extreme temperatures
and moist, salty environments.
Electromagnetic and Radio Frequency Interference
To reduce the possibility of EMI and RFI, follow these guidelines:
• Cover all open slots with a metal filler.
• Always use shielded cables with metal connector shells for attaching peripherals to the equipment.
To predict and prevent strong EMI, you might need to consult experts in radio frequency interference (RFI).
Note
Grounding
Electronic equipment is sensitive to variations in voltage supplied by the AC power source. Over voltage,
under voltage, and transients (or spikes) can erase data from the memory or cause components to fail. To
protect against these types of problems, you should always make sure that the racks that hold the servers or
networking devices are grounded. When the rack are grounded, the equipment installed in them is automatically
grounded. See the instructions for the products that you install in the rack for grounding steps. For additional
information, see
Installing the Grounding Kit, on page 32
Power Source
You should use dedicated power circuits (rather than sharing circuits with other heavy electrical equipment)
for each PDU you install in the Cisco R42612 rack. The circuits must be rated for 30 A or 32 A, 200 to 250
VAC. The receptacles for these circuits should be within 6 feet (1.8 m) of each PDU when it is installed in
the Cisco R42612 rack. Check the power at your site before installation and periodically after installation to
ensure that you are receiving clean power. Install a power conditioner if necessary.
Power Requirements
Refer to the documentation for the power requirements for the devices you plan to install in the Cisco R42612
rack.
Cisco R42612 Rack and RP-Series Metered Input PDU Installation Guide
13
Site Preparation
Corrosion
