Cisco Systems Cisco 3600 manual Wire Termination Safety Ground Overcurrent

Chapter 3 Installing the Router

Power Connections

Table 3-3 DC Wiring Requirements for Cisco 3660 Routers

					Wire Termination	Safety Ground	Overcurrent
Installed Power Supply			DC Input	Wire Size	Method	Wire Size	Protection
Nominal 24/48 VDC1			24 - 36 V, 16 A	AWG 12	Terminal block;	AWG 12	20 A
Identified by a terminal block and the				(3.0 mm2)	wires retained by	(3.0 mm2)	maximum
					retention screws
following printed label:
			36 - 60 V, 7 A	AWG 14	Terminal block;	AWG 12 or 14	15 A
				(2.0 mm2),	wires retained by	(3.0 or 2.0 mm2)	maximum
INPUT +/-	24-36V	16A		minimum	retention screws
	36-60V	7A
Nominal 48 VDC2			48 - 60 V, 8 A	AWG 14	Plug connector;	AWG 12 or 14	15 A
Identified by a plug connector and the				(2.0 mm2),	wires retained by	(3.0 or 2.0 mm2)	maximum
				minimum	spring-loaded
following printed label:
					receptacle

AC PS 100-240V~, 4-2A, 50/60 Hz

DC PS -48V to -60V , 8A

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:

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.

Tip Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.

Step 2 Cut the wires to length. Allow enough length for attachment to the bracket and for a service loop. (See Figure 3-47.)

Step 3 Strip the insulation to expose approximately 0.4 inch (10 mm) of conductor.

Step 4 If the power supply in your router has screw terminals, first connect the safety ground wire to the safety ground terminal of the DC terminal block, and then connect the power wires to the appropriate terminals of the DC terminal block. (See Figure 3-48or Figure 3-49.) Tighten the terminal screw to a torque of 8.0

± 0.5 in-lb (0.93 ± 0.05 N-m).

Warning The illustration shows the DC power supply terminal block. Wire the DC power supply as illustrated. The proper wiring sequence is ground to ground, positive to positive, and negative to negative. The ground wire should always be connected first and disconnected last. Statement 239

Cisco 3600 Series Routers Hardware Installation Guide

OL-2056-05 3-33