Table 2: Circuit Requirements for 3-kW Power Supplies
Requirement for Each Circuit
Number of
Circuits
Power Supply
AC Power Supplies
20 A at 110 VAC or 220 VAC
1
(N77-AC-3.0KW)
3-kW power supply
DC Power Supplies
20A
1
(N77-DC-3.0KW)
3-kW power supply
Table 3: Circuit Requirements for 3.5-kW HVAC/HVDC Power Supplies
Requirement for Each Circuit
Number of
Circuits
Power Supply
20 A at 110 VAC, 210 VAC, 220/230 VAC
and 277 VAC or 20 A at 210 VDC, 220/240
VDC and 380 VDC
1
(N77-HV-3.5KW)
3.5-kW
HVAC/HVDC
power supply
Step 5
Plan the placement of the input power receptacles within reach of the power cables used for each power supply
(see the following table for the maximum distances).
Typically, power receptacles are placed on the rack with the switch. If the DC power source is further than
allowed by the DC power cables, you can install a power interface unit (PIU) in the rack with the switch and
connect that to the power source with other cabling.
Maximum Distance Between Receptacle and Power Supply
Power Supply
12 feet (3.6 m)
All AC power supplies
14 feet (4.26 m)
HVAC/HVDC 3.5-kW power
supplies
Determined by the length of the power cord that you supply.
DC 3-kW power supplies
Rack and Cabinet Requirements
You can install the following types of racks or cabinets for your switch:
•
Standard perforated cabinets
Cisco Nexus 7718 Switch Site Preparation and Hardware Installation Guide
14
OL-30453-01
Preparing the Site
Rack and Cabinet Requirements