Installation Guide

Table Of Contents
Connecting DC-Powered Switches to a Power Source
Some Summit switches come with installed power supplies that are designed to be connected to DC
power. The instructions in this section provides additional details about connecting the following
Summit switches:
Summit X250e-24tDC
Summit X250e-24xDC
Summit X250e-48tDC
Summit X440-24tDC
Summit X440-48tDC
Summit X450a-24tDC
Summit X450a-24xDC
Summit X450a-48tDC
You must adhere to
specific safety requirements when you connect any of these Summit switches to a
DC power source.
Note
For centralized DC power connection, these products are intended to be installed in
Restricted Access Locations – like dedicated equipment rooms and equipment closets – in
accordance with Articles 110-16, 110-17, and 110-18 of the National Electric Code, ANSI/NFPA
70.
An optional redundant power supply, the EPS-150DC, is available for use with the Summit DC-
powered switches. When the EPS-150DC is used with a DC-powered Summit switch, the
power supplies (internal and redundant) are fully fault tolerant and load-sharing. If one power
supply fails, the other power supply will provide sucient power to operate the switch. See
EPS-150DC External Power Module (with EPS-T2) on page 167 for further details.
Before you connect the switch to a power source, complete the physical installation of the switch as
described in Installing Other Summit Switches in a Rack on page 325.
Then follow the instructions in the following sections:
1. Grounding a Summit X250e or X450a DC-Powered Switch on page 329.
2. Connecting the X250e or X450a DC Wiring Harness to the DC Source Voltage on page 331.
3. Attaching the DC Wiring Harness to the DC Power Socket on the Switch on page 331.
Grounding a Summit X250e or X450a DC-Powered Switch
Before you connect the power input cable to a Summit DC-powered switch, you must ground the
chassis, following the instructions in this section.
Gather the following materials to ground the Summit X250e or X450a DC-powered switch:
Stranded copper wire cable, minimum size 14 AWG, maximum size 6 AWG
The wire should be long enough to reach from the installed switch to the facility ground point
Torque screwdriver with 1/4-inch
flat blade
Installing Switches
Connecting DC-Powered Switches to a Power Source
Summit Family Hardware Installation Guide 329