Lenovo ThinkSystem NE25720 Installation Manual page 31

Statement 31
DANGER
Electrical current from power, telephone, and communication cables is
hazardous.
To avoid a shock hazard:







To Connect:
1. Turn OFF all power sources and
2. Attach signal cables to the
3. Attach power cords to the
4. Attach signal cables to other
5. Connect power cords to their
6. Turn ON all the power sources.
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Do not connect or disconnect any cables or perform installation,
maintenance, or reconfiguration of this product during an electrical storm.
Connect all power cords to a properly wired and grounded power source.
Connect to properly wired power sources any equipment that will be
attached to this product.
When possible, use one hand only to connect or disconnect signal cables.
Never turn on any equipment when there is evidence of fire, water, or
structural damage.
Disconnect the attached ac power cords, dc power sources, network
connections, telecommunications systems, and serial cables before you
open the device covers, unless instructed otherwise in the installation and
configuration procedures.
Connect and disconnect cables as described in the following table when
you install, move, or open covers on this product or attached devices.
equipment that is to be attached to
this product.
product.
product.
For ac systems, use appliance

inlets.
For dc systems, ensure correct

polarity of ‐48 V dc connections:
RTN is + and ‐48 V dc is ‐. Earth
ground should use a two‐hole
lug for safety.
devices.
sources.
To Disconnect:
1. Turn OFF all power sources and
equipment that is to be attached to
this product.
For ac systems, remove all power

cords from the chassis power
receptacles or interrupt power at
the ac power distribution unit.
For dc systems, disconnect dc

power sources at the breaker
panel or by turning off the power
source. Then, remove the dc
cables.
2. Remove the signal cables from the
connectors.
3. Remove all cables from the
devices.
Chapter 3: Installing NE2572O Hardware and Options
31