Cisco 3800 Series User Manual
Page 51
Power Connections
21
Connecting Cables to Cisco 3800 Series Routers
OL-5970-02
The following warning applies to the Cisco 3825 router 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 3845 router 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
summarize DC wiring requirements for Cisco 3825 and Cisco 3845 routers.
For a Cisco 3845 router, the safety ground wire connection must be at the same potential as the 0 V
(return) connection.
Table 2
DC Wiring Requirements for Cisco 3825 Routers
DC Input
1
1.
The input voltage tolerance limits for DC power are 18 and 72 VDC.
DC Input Wire Size
Safety Ground
Wire Size
Wire Terminal (Lug)
Overcurrent
Protection
24–36 VDC, 12 A, positive or
negative, single or dual source
AWG 14 (2.0 mm
2
)
AWG 14 (2.0 mm
2
),
minimum
Amp/Tyco No. 32957
or equivalent
20 A
36–60 VDC, 8 A, positive or negative,
single or dual source
Table 3
DC Wiring Requirements for Cisco 3845 Routers
DC Input
1
1.
The input voltage tolerance limits for DC power are 18 and 72 VDC.
DC Input
Wire Size
Safety Ground
Wire Size
Wire Terminal (Lug)
Overcurrent
Protection
24–36 V, 19 A, positive or negative,
single or dual source
AWG 12
(3.0 mm
2
)
AWG 12 (3.0 mm
2
)
minimum
Amp/Tyco No. 34852 or
equivalent
30 A
36–60 V, 13 A, positive or negative,
single or dual source
AWG 12 or 14
(3.0 or 2.0 mm
2
)
AWG 12 (3.0 mm
2
)
minimum
AWG 12: Amp/Tyco
No. 34852 or equivalent
AWG 14: Amp/Tyco
No. 32957 or equivalent
20–30 A