Power Requirements - Cisco Catalyst 6840 Series Hardware Installation Manual

Power Requirements

Step 2
Grasp the spring or alligator clip on the ESD wrist strap and momentarily touch the clip to a bare metal spot
(unpainted surface) on the rack. It is recommend that you touch the clip to an unpainted rack rail so that any
built-up static charge is then safely dissipated to the entire rack.
Step 3
Attach the alligator clip directly over the head of the system ground lug screw or to the system ground lug
barrel.
Figure 13: Attaching the ESD Wrist Strap to the System Ground Lug Screw
1
2
Power Requirements
When preparing your site for the switch installation, follow these requirements:
• When installing two power supplies, connect each power supply to a separate input power source. If you
• To prevent a loss of input power, be sure that the total maximum load on each source circuit is within
• You might decide to use an uninterruptible power supply (UPS) to protect against power failures at your
Catalyst 6840-X Switch Series Hardware Installation Guide
30
System ground lug
ESD wrist strap
fail to do this, your system might be susceptible to total power failure due to a fault in the external wiring
or a tripped circuit breaker.
the current ratings of the wiring and breakers.
site. Be aware when selecting a UPS that some UPS models that use ferroresonant technology can become
unstable when operating with the switch power supplies which use power factor correction (PFC). This
3 Alligator clip
4 Clip attached to the
system ground lug
Preparing for Installation