Powering the Switch
Important! Installation of this equipment must comply with local and national electrical codes. If necessary, consult with the appropriate regulatory agencies and inspection authorities to ensure compliance.
The switch operates with two internal power supplies. At least one power supply must connect to a power source. Two circuits provide redundancy protection. Appendix E displays the location of the power sockets (AC) or terminals (DC) on the rear panel of all switches covered by this guide.
This chapter includes sections that describe procedure for grounding and cabling AC and DC power supplies. After completing the instructions for your switch, proceed to Chapter 5.
Important! Read all installation instructions before connecting the system to the power source.
Non-Redundant Configuration: Connect power to either of the two power supplies.
Redundant Power Supply Configuration: Connect power to both power supplies.
Power down the Switch: Remove all power cords and wires from the power supplies.
Important! This equipment must be grounded. Never defeat the ground conductor.
Important! This unit requires overcurrent protection.
Cabling the AC Power Supply (DCS-7010T-48)
Grounding the Switch
After mounting the switch into the rack, connect the switch to the data center ground. Figure 4-1 displays the location of the grounding pads located on the right side of the rear panel.
Important! Grounding wires and grounding lugs are not supplied. Wire size should meet local and national installation requirements. Commercially available 6 AWG wire is recommended for U.S. installations. M4x0.7 screws are required to secure the wire to the grounding pad.
Figure 4-1: Earth Grounding Pad and AC Power Sockets
Connecting Power Cables to the AC Supply
AC power supplies require circuits that provide 100-240 VAC, 50 or 60 Hz, and 5.29-2.2 A. Figure 4-1 shows the location of the AC power sockets on the rear switch panel. Power supplies use cables that comply with IEC-320 and have a C13 plug. The accessory kit provides two IEC-320 C13 to C14 power cables.
Cabling the DC Power Supply (DCS-7010T-48-DC)
Figure 4-2 displays the location of the earth grounding pad and the DC input terminals.
Figure 4-2: DC Input Terminals and DC Grounding Pad
Figure 4-3 displays DC power terminals on the left side of the rear panel with the terminal cover in place (left illustration) and with the terminal cover removed (right illustration).
Figure 4-3: DC Input Terminals – terminal cover in place (left); terminal cover removed (right)
Important! Grounding lugs for the earth grounding pads and grounding wires are not supplied. M4 screws are required. Wire size should meet local and national installation requirements. Recommended grounding wire sizes are 6 AWG (earth ground) and 16 AWG (PE ground). M4x0.7 screws are required to secure the wire to the grounding pads. Screws are pre-installed for the PE ground terminals.
Each DC input terminal accepts insulated crimp-on spade lugs, insulated crimp-on ring connectors, or bare wires. Ensure the wires connecting the DC power supply to the power source meet the following:
DC Input Wire Size: 14 AWG (1.5 mm2) to 18 AWG (0.75 mm2)
PE Ground Wire Size: 14 AWG (1.5 mm2) to 18 AWG (0.75 mm2)
Wire Terminal (Lug): ring or spade, 14-16 AWG, #6 / M3.5 screw
Overcurrent protection: 20 A.
Important! Wire size must comply with local and national requirements and electrical codes. Use only copper wire.
DC power supplies require 40 – 72 VDC (absolute voltage) and draws 1.8 – 1.0 A. The power supply has reverse polarity protection.
Important! Before performing any installation actions, ensure power is removed from DC circuits by turning off the power line circuits on DC power lines servicing the circuits.

Apply the ground connection first during installation and remove last when removing power.
To connect a DC power supply to a power source:
Step 1 Attach the secondary grounding pad to the Data Center ground (Figure 4-2).
Step 2 Remove the terminal cover to expose the connectors (Figure 4-3).
Step 3 Attach the appropriate lugs to the source DC wires.
Step 4 Connect the DC-input wires to the terminal block in this order:
1. Ground cable to the PE Ground connector on the terminal block.
2. Negative (–) source DC cable to the negative (–) connector on the terminal block.
3. Positive (+) source DC cable to the positive (+) connector on the terminal block.
Step 5 Replace the terminal cover.