Cisco 3700 Series Hardware Installation Manual page 59

Chapter 3 Installing the Router
DC Wiring Requirements for Cisco 3725 Routers
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that
Warning
the protective device is rated not greater than:
15A, 60VDC. Statement 1005
Caution Dual sources with opposite-polarity grounding damage equipment.
A Cisco 3725 router with a DC-input power supply requires copper wire and crimp-type terminals for
the power connections.
Table 3-1 DC Wiring Requirements for Cisco 3725 Routers
DC Power
Source DC Input
Nominal 24/48 24–36 VDC, 9 A, positive or
1
VDC negative, single source or dual
sources
36–60 VDC, 4 A, positive or
negative, single source or dual
sources
1. The input voltage tolerance limits for DC power are 18 and 72 VDC.
Wiring Procedure for Cisco 3725 Routers
To connect a Cisco 3725 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
Step 2 Strip the wires to the appropriate length for the terminals. The strip length is 1/8 to 3/16 inch (3 to 5 mm)
for Molex number 19193-0009 and for AMP number 324159-0 terminals.
Step 3 Crimp the terminals to the power input and safety ground wires.
When stranded wiring is required, use approved wiring terminations, such as closed-loop or
Warning
spade-type with upturned lugs. These terminations should be the appropriate size for the wires and
should clamp both the insulation and conductor. Statement 1002
Remove the plastic cover from the terminal block. Save it for reinstallation after you finish wiring.
Step 4
Connect the DC power input wires to the terminal block as shown in
Step 5
with the on/off switch, organize the wires downward from the terminal block.
OL-2180-08
Table 3-1 summarizes the wiring requirements.
DC Input Safety Ground
Wire Size Wire Size
AWG 18 AWG 14
2
(1.0 mm ) (2.0 mm
AWG 18 AWG 14
2
(1.0 mm ) (2.0 mm
Cisco 3700 Series Routers Hardware Installation Guide
Wire Terminal (Lug)
Molex part number
2
) 19193-0017, or equivalent
Molex part number
2
) 19193-0017, or equivalent
Figure 3-16. To avoid interference
Power Connections
Overcurrent
Protection
15 A
maximum
15 A
maximum
3-13