Cisco WS-C2950T-24 Hardware Installation Guide - Page 107
DC Wiring Requirements for Cisco 3900 Series Routers
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Chapter 3 Installing and Connecting the Router Connecting Power DC Wiring Requirements for Cisco 3900 Series Routers If your router has a DC-input power supply, follow the directions in this section for proper wiring. If backup power is required, see the "Connecting to Backup Power" section. Warning Use copper conductors only. Statement 1025 Warning This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation. Install only in accordance with national and local wiring regulations. Statement 1045 The following warning applies to the Cisco 3925 and Cisco 3925-NOVPN routers only: Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than: 60 VDC, 20 A. Statement 1005 The following warning applies to the Cisco 3945 and Cisco 3945-NOVPN routers only: Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than: 60 VDC, 30 A. Statement 1005 Warning This unit might have more than one power supply connection. All connections must be removed to de-energize the unit. Statement 1028 Table 3-3 summarizes DC wiring requirements for all Cisco 3925 and Cisco 3945 routers. Note For Cisco 3945 and Cisco 3945-NOVPN routers, the safety ground wire connection must be at the same potential as the 0 V (return) connection. Table 3-3 DC Wiring Requirements for Cisco 3900 DC Power Input 24-36 VDC, 12 A, positive or negative, single source or dual sources 36-60 VDC, 8 A, positive or negative, single or dual source DC Input Wire Size AWG 10 Safety Ground Wire Terminal Overcurrent Wire Size (Lug) Protection AWG 10 minimum Panduit No. 30 A maximum LCAS8-10F-L OL-18712-01 Cisco 2900 and 3900 Series Hardware Installation 3-25