Cisco 3700 Series Hardware Installation Manual page 64

Power Connections
DC Wiring Requirements for Cisco 3745 Routers
A Cisco 3745 router with a DC-input power supply requires copper wire for the power connections.
Table 3-2
Note Two types of DC input power supply can be installed in a Cisco 3745 router: power supplies rated at
24/48 VDC nominal input, and power supplies rated at 48 VDC nominal input.
the wiring requirement for both power supplies.
Table 3-2 DC Wiring Requirements for Cisco 3745 Routers
Installed Power Supply
1
Nominal 24/48 VDC
Identified by the following printed
label:
CISCO 3745
~
100-240V 50/60Hz 10A
OR Input +/- 24-36 V 15 A
36-60 V 7 A
2
Nominal 48 VDC
Identified by the following printed
label:
CISCO 3745
~
100-240V 50/60Hz, 10A
OR 48-60V , 10A
1. The input voltage tolerance limits for nominal 24/48-V power supplies are 18 and 72 VDC.
2. The input voltage tolerance limits for nominal 48-V power supplies are 38 and 72 VDC.
Wiring Procedure for DC Input
To connect the router to a DC power source, perform the following steps:
Remove power from the DC circuit. To ensure that power is removed from the DC circuit, locate the
Step 1
circuit breaker for the DC circuit, switch the circuit breaker to the OFF position, and tape the
circuit-breaker switch in the OFF position.
Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.
Tip
Strip the wires to the appropriate length for the terminals. The strip length is 1/8 to 3/16 inch (3 to 5 mm)
Step 2
for Molex number 19073-0009 terminals and for AMP/Tyco number 52961 terminals.
Crimp the terminals onto the DC power input wires.
Step 3
Cisco 3700 Series Routers Hardware Installation Guide
3-18
summarizes the wiring requirements.
DC Input Wire
DC Input Size
24–36 V, AWG 12
15 A (3.0 mm
36–60 V, AWG 12 or 14
7 A (3.0 or 2.0 mm
!
48–60 V, AWG 14 or 16
10 A (2.0 or 1.2 mm
Safety Ground
Wire Size
AWG 12
2 2
) (3.0 mm ),
minimum
AWG 12
2 2
) (3.0 mm ),
minimum
AWG 14
2 2
) (2.0 mm ),
minimum
Chapter 3 Installing the Router
Table 3-2 summarizes
Overcurrent
Wire Terminal (Lug) Protection
Amp/Tyco No. 20 A
52961 or equivalent maximum
For AWG 12: 20 A
Amp/Tyco No. maximum
52961 or equivalent
For AWG 14: Molex
No. 19099-0017 or
equivalent
For AWG 14 or 16: 20 A
Molex No. maximum
19099-0017 or
equivalent
OL-2180-08