Safety with Electricity
Before working on a chassis or with power supplies, unplug the power cord on AC units. Disconnect the
power at the circuit breaker on DC units. Statement 12
Warning
Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces,
and watches). Metal objects heat up when connected to power and ground and can cause serious burns or
weld the metal object to the terminals. Statement 43
Warning
Avoid using or servicing any equipment that has outdoor connections during an electrical storm. There may
be a risk of electric shock from lightning. Statement 1088
Warning
Read the installation instructions before connecting the system to the power source. Statement 1004
Warning
When you connect or disconnect the power and relay connector with power applied, an electrical arc can
occur. This action can cause an explosion in hazardous area installations. Be sure that power is removed from
the switch and alarm circuit. Be sure that power cannot be accidentally turned on or verify that the area is
nonhazardous before proceeding. Failure to securely tighten the power and relay connector captive screws
can result in an electrical arc if the connector is accidentally removed. Statement 1058
Warning
The plug-socket combination must be accessible always, because it serves as the main disconnecting device.
Statement 1019
Warning
This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence
of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician
if you are uncertain that suitable grounding is available. Statement 1024
Warning
This unit may have more than one power supply connection. All connections must be removed to de-energize
the unit. Statement 1028
Warning
Cisco NCS 540 Router Hardware Installation Guide
3
Safety Warnings
Safety with Electricity