3-25
Cisco 2900 and 3900 Series Hardware Installation
OL-18712-01
Chapter 3 Installing and Connecting the Router
Connecting Power
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
“Connecting to Backup Power” section.
Warning
Use copper conductors only.
Statement 1025
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:
Warning
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that
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:
Warning
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that
the protective device is rated not greater than:
60 VDC, 30 A.
Statement 1005
Warning
This unit might have more than one power supply connection. All connections must be removed to
de-energize the unit.
Statement 1028
Table 3-3 summarizes DC wiring requirements for all Cisco 3925 and Cisco 3945 routers.
Note
For Cisco 3945 and Cisco 3945-NOVPN routers, the safety ground wire connection must be at the same
potential as the 0 V (return) connection.
Ta b l e 3-3 DC Wiring Requirements for Cisco 3900
DC Power Input
DC Input
Wire Size
Safety Ground
Wire Size
Wire Terminal
(Lug)
Overcurrent
Protection
24-36 VDC, 12 A,
positive or negative,
single source or dual
sources
AWG 10 AWG 10
minimum
Panduit No.
LCAS8-10F-L
30 A maximum
36-60 VDC, 8 A,
positive or negative,
single or dual source
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