Dc Wiring Requirements For Cisco 3900 Series Routers - Cisco WS-C2950-24 Installation Manual

Chapter 3 Installing and Connecting the Router

DC Wiring Requirements for Cisco 3900 Series Routers

If your router has a DC-input power supply, follow the directions in this section for proper wiring. If
backup power is required, see the
Use copper conductors only. Statement 1025
Warning
Warning This product requires short-circuit (overcurrent) protection, to be provided as part of the building
installation. Install only in accordance with national and local wiring regulations. Statement 1045
The following warning applies to the Cisco 3925 and Cisco 3925-NOVPN routers only:
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that
Warning
the protective device is rated not greater than:
60 VDC, 20 A.
Statement 1005
The following warning applies to the Cisco 3945 and Cisco 3945-NOVPN routers only:
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that
Warning
the protective device is rated not greater than:
60 VDC, 30 A.
Statement 1005
This unit might have more than one power supply connection. All connections must be removed to
Warning
de-energize the unit. Statement 1028
Table 3-3
For Cisco 3945 and Cisco 3945-NOVPN routers, the safety ground wire connection must be at the same
Note
potential as the 0 V (return) connection.
Table 3-3
DC Power Input
24-36 VDC, 12 A,
positive or negative,
single source or dual
sources
36-60 VDC, 8 A,
positive or negative,
single or dual source
OL-18712-01
"Connecting to Backup Power"
summarizes DC wiring requirements for all Cisco 3925 and Cisco 3945 routers.
DC Wiring Requirements for Cisco 3900
DC Input
Wire Size
AWG 10
Safety Ground Wire Terminal
Wire Size (Lug)
AWG 10 Panduit No.
minimum LCAS8-10F-L
Cisco 2900 and 3900 Series Hardware Installation
Connecting Power
section.
Overcurrent
Protection
30 A maximum
3-25