Cisco UCS 6454 Installation Manual page 32

Preventing Electrostatic Discharge Damage
Although the metal carrier helps to protect the board from ESD, always use an ESD grounding strap when
handling modules.
For preventing ESD damage, follow these guidelines:
• Always use an ESD wrist strap and ensure that it makes maximum contact with bare skin.
• ESD grounding straps are available with banana plugs, metal spring clips, or alligator clips. All Cisco
UCS Fabric Interconnects are equipped with a banana plug connector (identified by the ground symbol
next to the connector) somewhere on the front panel. We recommend that you use a personal ESD
grounding strap equipped with a banana plug.
• If you choose to use the disposable ESD wrist strap supplied with most field-replaceable units or an ESD
wrist strap equipped with an alligator clip, you must attach the system ground lug to the fabric interconnect
in order to provide a proper grounding point for the ESD wrist strap. This system ground is also referred
to as the network equipment building system (NEBS) ground.
• If your fabric interconnect does not have the system ground attached, you must install the system ground
lug. See the
fabric interconnect system ground pads.
You do not need to attach a supplemental system ground wire to the system ground lug; the lug provides a
direct path to the bare metal of the fabric interconnect. Before you install the system ground lug, you must
correctly attach the ESD wrist strap.
In addition, follow these guidelines when handling components:
• Handle carriers by available handles or edges only; avoid touching the printed circuit boards or connectors.
• Place a removed component board-side-up on an antistatic surface or in a static-shielding container. If
you plan to return the component to the factory, immediately place it in a static-shielding container.
• Never attempt to remove the printed circuit board from the metal carrier.
Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be between
1 and 10 megohm (Mohm).
Procedure
Step 1 Attach the ESD wrist strap to bare skin as follows:
a) If you are using the ESD wrist strap supplied with the FRUs, open the wrist strap package and unwrap
the ESD wrist strap. Place the black conductive loop over your wrist and tighten the strap so that it makes
good contact with your bare skin.
b) Open the package and remove the ESD wrist strap. Locate the end of the wrist strap that attaches to your
body and secure it to your bare skin.
Step 2
Grasp the spring or alligator clip and momentarily touch the clip to a bare metal spot, such as an unpainted
rack rail, to safely dissipate any built-up static charge to the entire rack.
Step 3 Attach the ESD strap to the system ground in one of the following ways:
• If you are using a wrist strap that is equipped with a plug, insert the plug into an open screw hole used
for the grounding lug.
Cisco UCS 6454 Fabric Interconnect Hardware Installation Guide
26
Establishing System Ground, on page 24
Installing the Cisco UCS Fabric Interconnect
for installation instructions and location of the