Cisco 3800 Series Specifications download pdf (Page 19)

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/Tyco

number 32957 terminals and 5/16 to 3/8 inch (8 to 9 mm) for Amp/Tyco number 34852 terminals.

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

Step 4 Remove the plastic safety 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 12. Tighten the terminal screws to 10.0 ± 0.5 in-lb (1.1 ± 0.05 N-m).

Table 1 DC Wiring Requirements for Cisco 3825 Routers

DC Input

1. The input voltage tolerance limits for DC power are 18 and 72 VDC.

DC Input Wire Size

Safety Ground Wire

Size Wire Terminal (Lug)

Overcurrent

Protection

24–36 VDC, 12 A, positive or

negative, single source or dual sources

AWG 14 (2.0 mm

) AWG 14 (2.0 mm

minimum

Amp/Type No. 32957

or equivalent

20 A maximum

36–60 VDC, 8 A, positive or negative,

single source or dual sources

Table 2 DC Wiring Requirements for Cisco 3845 Routers

DC Input

1. The input voltage tolerance limits for DC power are 18 and 72 VDC.

DC Input

Wire Size

Safety Ground

Wire Size Wire Terminal (Lug)

Overcurrent

Protection

24–36 V, 19 A, positive or negative,

single source or dual sources

AWG 12

(3.0 mm

)

AWG 12 (3.0 mm

minimum

Amp/Tyco No. 34852 or

equivalent

30 A

36–60 V, 13 A, positive or negative,

single source or dual sources

AWG 12 or 14

(3.0 or 2.0 mm

)

AWG 12 (3.0 mm

minimum

For AWG 12: Amp/Tyco

No. 34852 or equivalent

For AWG 14: Amp/Tyco

No. 32957 or equivalent

20 - 30 A

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 39 40

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Cisco 3800 Series Specifications Page 19

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