Plant Wiring Guidelines; Interference Considerations With Cabling - Cisco 7500 Series Configuration Manual

Plant Wiring Guidelines

Figure 2-5
IEC 320 20-amp connector
(to the AC power supply)
The DC-powered chassis requires a minimum 35A dedicated service (at –48 VDC). We recommend that
you use an 8-AWG, highly flexible stranded cable for the DC power connections.
conductor preparations.
Figure 2-6
End View
.39

Plant Wiring Guidelines

This section provides guidelines for setting up the plant wiring and cabling at your site. When planning
the location of the new system, consider wiring issues, distance limitations for signaling,
electromagnetic interference, and connector compatibility, as described in the sections that follow.

Interference Considerations with Cabling

When wires are run for any significant distance in an electromagnetic field, interference can occur
between the field and the signals on the wires. This fact has two implications for the construction of plant
wiring:
•
•
Cisco 7500 Series Installation and Configuration Guide
2-10
20A AC-Input Power Cable Connector, Plug, and Receptacle (Cisco 7513,
Cisco 7513-MX, and Cisco 7576)
DC-Input Power Cable Connection to Terminal Block (Cisco 7513, Cisco 7513-MX, and
Cisco 7576)
.925
.83
Maximum exposed
conductor surface
.210
.610
.140
Bad practices can result in radio interference emanating from the plant wiring.
Strong electromagnetic interference (EMI), especially as caused by lightning or radio transmitters,
can destroy the signal drivers and receivers in the router, and can even create an electrical hazard by
conducting power surges through lines and into equipment. (Review the safety warnings in the
"Safety Recommendations" section on page
20-amp plug
All measurements in inches
Crimp area
2-2.)
Chapter 2 Preparing for Installation
20-amp receptacle
Figure 2-6
8-AWG conductor
shows the
OL-5008-03 B0