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120 VAC, 15 A applies to AC and AC-IP power supplies in Cisco 3825 and Cisco 3845 routers.

Note

This product requires surge protection to be provided as part of the building installation. To comply with the Telcordia

Note

GR-1089 NEBS standard for electromagnetic compatibility and safety, an external surge protective device (SPD) is

required at the AC power service equipment.

Connecting the Router to DC Power

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 the Router to Backup Power" section on page 23.

DC Wiring Requirements for Cisco 3800 Series Routers

Caution

DC return is isolated from the frame (NEBS DC-I).

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

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

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

60 VDC, 20 A applies to DC power in Cisco 3825 routers and 60 VDC, 30 A applies to DC power in Cisco 3845

Note

routers.

Warning

Use copper conductors only. Statement 1025

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.