Cisco 7010 Installation Manual page 181

Appendix A Power Requirements for Firepower Devices
Frequency Range
The frequency range of the AC power supply is 47 Hz to 63 Hz. Frequencies outside this range may cause
the appliance to not operate or to operate incorrectly.
Power Cords
The power connections on the power supplies are IEC C14 connectors and they will accept IEC C13
connectors. A UL-recognized power cord must be used. The minimum wire gauge is 16 AWG. The cords
supplied with the appliances are 16 AWG, UL-recognized cords with NEMA 515P plug. Contact the
factory about other power cords.
DC Installation
Separate circuits are required to create redundant power sources. Use an uninterruptible or
battery-backed power source to prevent power status issues or power loss due to input line power
glitches.
Do not connect AC power to DC supplies.
Caution
Supply sufficient power to each power supply to run the entire appliance. The voltage and current ratings
for each supply are listed on the label on the appliance.
Use an external Surge Protection Device at the input of the network equipment where the Firepower
System is to be installed.
Separate Circuit Installation
If separate circuits are used, each circuit must be rated to the full rating of the appliance. This
configuration provides for circuit failure and power supply failure.
Example: Each supply is attached to a different –48VDC circuit. Each circuit must be capable of
supplying 25A, as stated on the label.
Same Circuit Installation
If the same circuit is used to feed both supplies, then the power rating of one supply applies to the whole
box. This configuration only provides protection from a power supply failure.
Example: Both supplies are attached to the same –48VDC circuit. The maximum draw from this circuit
would be 25A, as stated on the label.
Use of this optimization requires that the power cords are rated for the full rating for each supply.
Caution
DC Voltage
The power supplies will work with these voltages:
• -48VDC nominal referenced to RTN
Firepower and AMP 83xx Family Appliances
Firepower 7000 and 8000 Series Installation Guide
A-15