Safety With Electricity - Cisco ASR 903 Installation Instructions Manual

Safety with Electricity

Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous
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voltages and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt
other equipment; and they direct the flow of cooling air through the chassis. Do not operate the system
unless all cards, faceplates, front covers, and rear covers are in place. Statement 1029
Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when
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servicing. Statement 1034
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams
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or view directly with optical instruments. Statement 1051
Safety with Electricity
Before working on a chassis or working near power supplies, unplug the power cord on AC units; disconnect
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the power at the circuit breaker on DC units. Statement 12
Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces,
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and watches). Metal objects will heat up when connected to power and ground and can cause serious burns
or weld the metal object to the terminals. Statement 43
Avoid using or servicing any equipment that has outdoor connections during an electrical storm. There
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may be a risk of electric shock from lightning. Statement 1088
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
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Statement 1003
Read the installation instructions before connecting the system to the power source. Statement 1004
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This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that the
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protective device is rated: For a -48/-60 VDC installation, the wire shall be 12 AWG minimum with a 20
A branch circuit breaker. For a 24 VDC installation, the wire shall be 8 AWG minimum with a 40 A
branch circuit breaker. Statement 1005
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