Cisco ASR 903 Installation Manual page 62

Safety with Electricity
Warning
To prevent accidental discharge in the event of a power line cross, route on-premise wiring away from power
cables and off-premise wiring, or use a grounded shield to separate the on-premise wiring from the power
cables and off-premise wiring. A power line cross is an event, such as a lightning strike, that causes a power
surge. Off-premise wiring is designed to withstand power line crosses. On-premise wiring is protected from
power line crosses by a device that provides overcurrent and overvoltage protection. Nevertheless, if the
on-premise wiring is in close proximity to or not shielded from, the off-premise wiring or power cable during
a lightning strike or power surge, the on-premise wiring can carry a dangerous discharge to the attached
interface, equipment, or nearby personnel. Statement 338
Warning High leakage current – earth connection essential before connection to system power supply. Statement 342
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement
1001
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Warning
Read the installation instructions before connecting the system to the power source. Statement 1004
Warning
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated for 550 W DC Power Supply (PID A900-PWR550-D and A900-PWR550-D-E):
For a -48/-60 VDC installation, the wire shall be 12 AWG minimum with a 20 A circuit breaker. For a 24
VDC installation, the wire shall be 8 AWG minimum with a 40 A branch circuit breaker. Statement 1005
Warning
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the
protective device is rated for 1200 W DC Power Supply (PID A900-PWR1200-D): For a -48/-60 VDC
installation, the wire shall be 10 AWG minimum with a 50 A circuit breaker. Statement 1005
Warning
This product relies on the building's installation for short-circuit (overcurrent) protection. For an AC installation,
ensure that the branch circuit breaker is rated a maximum 20A.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
52
Preparing for Installation