Cisco Systems 2800 manual Wiring Procedure for DC Input, Statement

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.

Warning When stranded wiring is required, use approved wiring terminations, such as closed-loop or 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

Step 2 Strip the wires to the appropriate length for the terminals. The strip length is 3/16 to 1/4 inch (5 to 6 mm) for Amp number 32957 terminals.

Step 3 Crimp the terminals onto the DC power input and safety ground wires.

Step 4 Remove the plastic covers from the terminal block. Save the covers for reinstallation after you finish wiring.

Step 5 Connect the wires to the terminal block, starting with the safety ground wire. Connect each wire to the appropriate terminal as shown in Figure 18. Tighten the terminal screws to 8.0 ± 0.5 in-lb (0.9 ± 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
Warning	An exposed wire lead from a DC-input power source can conduct harmful levels of electricity. Be sure that no
	exposed portion of the DC-input power source wire extends from the terminal block plug. Statement 122
Caution	Do not overtorque the terminal block screws. The recommended torque is 8.0 ± 0.5 in-lb (0.90 ± 0.05 N-m).

Figure 18 DC Power Connections for Cisco 2800 Series Routers (Typical)

	-DC, input A
	Return, input A
	Safety ground
	Return, input B
	-DC, input B
A +	+ B

A + + B

Return, input A +DC, input A Safety ground +DC, input B Return, input B

Terminal block

Negative DC input

Terminal block

Positive DC input

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