Dc Wiring Requirements - Cisco 2851 - Integrated Services Router User Manual

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
Use copper conductors only. Statement 1025
Warning
If your router has a DC-input power supply, follow the directions in this section for proper wiring.
A router with a DC-input power supply has a terminal block for the DC power connections. If backup
power is required, see the

DC Wiring Requirements

A Cisco 2811, Cisco 2821, or Cisco 2851 router with a DC-input power supply requires copper wire and
crimp-type terminals for the power connections.
requirements.
You can connect a single DC power source to either the A input or the B input. If there are dual power
sources, connect one source to the A input and one source to the B input; both sources must be the same
polarity and voltage.
Table 1 DC Wiring Requirements for Cisco 2811 Routers
DC Power Input
24–36 VDC, 8 A,
positive or negative,
single source or dual sources
36–60 VDC, 5 A,
positive or negative,
single source or dual sources
Table 2 DC Wiring Requirements for Cisco 2821 and Cisco 2851 Routers
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 source or dual sources
OL-5787-02
"Connecting Routers to Backup Power" section on page
Safety Ground
DC Input Wire Size Wire Size
2
AWG 14 (2.0 mm ) AWG 14 (2.0 mm
minimum
Safety Ground
DC Input Wire Size Wire Size
2
AWG 14 (2.0 mm ) AWG 14 (2.0 mm
minimum
Table 1 and Table 2 summarize the wiring
Wire Terminal (Lug)
2
), Amp/Tyco No. 32957 or
equivalent
Wire Terminal (Lug)
2
), Amp/Tyco No. 32957
or equivalent
Cable Connection Procedures for Cisco 2800 Series Routers
Power Connections
9.
Overcurrent
Protection
20 A
maximum
Overcurrent
Protection
20 A
maximum
3