14
Warning
This product relies on the building’s installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated not greater than:
20A, 60VDC.
Statement 1005
Warning
Use copper conductors only.
Statement 1025
DC Wiring Requirements
A Cisco 3745 router with a DC-input power supply requires copper wire for the power connections. Table 2 summarizes the
wiring requirements.
Wiring Procedure for DC Input
To connect the router to a DC power source, perform the following steps:
Step 1
Remove power from the DC circuit. To ensure that power is removed from the DC circuit, locate the circuit breaker for
the DC circuit, switch the circuit breaker to the OFF position, and tape the circuit-breaker switch in the OFF position.
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Tip
Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.
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 19073-0009 terminals and for AMP/Tyco number 52961 terminals.
Table 2
DC Wiring Requirements for Cisco 3745 Routers
Installed Power Supply
DC Input
DC Input Wire
Size
Safety Ground
Wire Size
Wire Terminal (Lug)
Overcurrent
Protection
Nominal 24/48 VDC
1
Identified by the following printed
label:
1. The input voltage tolerance limits for nominal 24/48 V power supplies are 18 and 72 VDC.
24 - 36 V, 15 A AWG 12
(3.0 mm
2
)
AWG 12
(3.0 mm
2
),
minimum
Amp/Tyco No.
52961 or equivalent
20 A
maximum
36 - 60 V, 7 A
AWG 12 or 14
(3.0 or 2.0 mm
2
)
AWG 12
(3.0 mm
2
),
minimum
For AWG 12:
Amp/Tyco No.
52961 or equivalent
For AWG 14: Molex
No. 19099-0017 or
equivalent
20 A
maximum
Nominal 48 VDC
2
Identified by the following printed
label:
2. The input voltage tolerance limits for nominal 48 V power supplies are 38 and 72 VDC.
48 - 60 V, 10 A AWG 14 or 16
(2.0 or 1.2 mm
2
)
AWG 14
(2.0 mm
2
),
minimum
For AWG 14 or 16:
Molex No.
19099-0017 or
equivalent
20 A
maximum
100-240V 50/60Hz 10A
OR Input +/- 24-36 V 15 A
36-60 V 7 A
!
CISCO 3745
~
100-240V 50/60Hz, 10A
OR 48-60V , 10A
!
CISCO 3745
~
