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frequency of 50/60 Hz. The power supply modules meet standard voltage requirements for both U.S. and
international operation. The power supply modules use standard industrial wiring with line-to-neutral or
line-to-line power connections.
Power cable requirements
Each enclosure requires two power cables designed for use with the enclosure power supply module. Each
power cable connects one of the power supply modules to an independent, external power source. To
ensure power redundancy, connect the two power cables to two separate circuits; for example, to one
commercial circuit and one uninterruptible power source (UPS).
Preventing electrostatic discharge
To prevent damaging the system, be aware of the precautions you need to follow when setting up the
system or handling parts. A discharge of static electricity from a finger or other conductor may damage
system boards or other static-sensitive devices. This type of damage may reduce the life expectancy of the
device.
To prevent electrostatic damage:
• Avoid hand contact by transporting and storing products in static-safe containers.
• Keep electrostatic-sensitive parts in their containers until they arrive at static-protected workstations.
• Place parts in a static-protected area before removing them from their containers.
• Avoid touching pins, leads, or circuitry.
• Always be properly grounded when touching a static-sensitive component or assembly.
Grounding methods to prevent electrostatic discharge
Several methods are used for grounding. Use one or more of the following methods when handling or
installing electrostatic-sensitive parts:
• Use a wrist strap connected by a ground cord to a grounded workstation or computer chassis. Wrist
straps are flexible straps with a minimum of 1 megohm (± 10 percent) resistance in the ground cords.
To provide proper ground, wear the strap snug against the skin.
• Use heel straps, toe straps or boot straps at standing workstations. Wear the straps on both feet when
standing on conductive floors or dissipating floor mats.
• Use conductive field service tools.
• Use a portable field service kit with a folding static-dissipating work mat.
If you do not have any of the suggested equipment for proper grounding, have an authorized technician
install the part. For more information about static electricity or assistance with product installation, contact
support.lenovo.com, select Product Support, and navigate to Storage Products.
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