Cisco 3845 Quick Start Guide - Page 18

A Cisco 3800 series router with a DC-input power supply requires copper wire for the power connections. Table 1 and Table 2 summarize the DC wiring requirements. If you connect dual DC power sources to a Cisco 3825 router, both sources must be the same polarity and voltage. For a Cisco 3845 router, the safety ground wire connection must be at the same potential as the 0 V (return) connection. Table 1 DC Wiring Requirements for Cisco 3825 Routers DC Input1 24-36 VDC, 12 A, positive or negative, single source or dual sources DC Input Wire Size AWG 14 (2.0 mm2) Safety Ground Wire Size AWG 14 (2.0 mm2), minimum Wire Terminal (Lug) Amp/Type No. 32957 or equivalent 36-60 VDC, 8 A, positive or negative, single source or dual sources 1. The input voltage tolerance limits for DC power are 18 and 72 VDC. Overcurrent Protection 20 A maximum Table 2 DC Wiring Requirements for Cisco 3845 Routers DC Input1 DC Input Wire Size Safety Ground Wire Size Wire Terminal (Lug) 24-36 V, 19 A, positive or negative, single source or dual sources 36-60 V, 13 A, positive or negative, single source or dual sources AWG 12 (3.0 mm2) AWG 12 or 14 (3.0 or 2.0 mm2) AWG 12 (3.0 mm2), minimum AWG 12 (3.0 mm2), minimum Amp/Tyco No. 34852 or equivalent For AWG 12: Amp/Tyco No. 34852 or equivalent For AWG 14: Amp/Tyco No. 32957 or equivalent 1. The input voltage tolerance limits for DC power are 18 and 72 VDC. Overcurrent Protection 30 A 20 - 30 A 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 Step 3 Step 4 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. Crimp the terminals onto the DC power input and safety ground wires. Remove the plastic safety covers from the terminal block. Save the covers for reinstallation after you finish wiring. 18