Cisco 3845 Hardware Guide - Page 51

DC Input, DC Input Wire Size, Safety Ground, Wire Size, Wire Terminal Lug, Overcurrent, Protection - rate limit

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Power Connections 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 Table 2 and Table 3 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 Input1 24-36 VDC, 12 A, positive or negative, single or dual source DC Input Wire Size AWG 14 (2.0 mm2) Safety Ground Wire Size AWG 14 (2.0 mm2), minimum Wire Terminal (Lug) Amp/Tyco No. 32957 or equivalent Overcurrent Protection 20 A 36-60 VDC, 8 A, positive or negative, single or dual source 1. The input voltage tolerance limits for DC power are 18 and 72 VDC. Table 3 DC Wiring Requirements for Cisco 3845 Routers DC Input1 24-36 V, 19 A, positive or negative, single or dual source 36-60 V, 13 A, positive or negative, single or dual source DC Input Wire Size AWG 12 (3.0 mm2) AWG 12 or 14 (3.0 or 2.0 mm2) 1. The input voltage tolerance limits for DC power are 18 and 72 VDC. Safety Ground Wire Size AWG 12 (3.0 mm2) minimum AWG 12 (3.0 mm2) minimum Wire Terminal (Lug) Overcurrent Protection Amp/Tyco No. 34852 or 30 A equivalent AWG 12: Amp/Tyco 20-30 A No. 34852 or equivalent AWG 14: Amp/Tyco No. 32957 or equivalent OL-5970-02 Connecting Cables to Cisco 3800 Series Routers 21

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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
Table 2
and
Table 3
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