Preparation For Wiring - Cisco LightStream 2020 Installation Manual

Wiring a DC-Powered System
Wiring a DC-Powered System
The procedure in this section explains how to wire a DC-powered LS2020 switch to a DC power
source. This task should be performed only by qualified service personnel or a licensed electrician.
This section applies only to systems with the DC power option. If you have a standard AC-powered
system, skip to the section "Installing Fantails."
For general information on DC-powered LS2020 systems, see the LightStream 2020 Hardware
Reference and Troubleshooting Guide. For power specifications, see the LightStream 2020 Site
Planning and Cabling Guide.

Preparation for Wiring

Note the following in preparation for wiring a DC-powered LS2020 switch:
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2-6 LightStream 2020 Installation Guide
The system power connection on the DC power tray is provided by a 3-position terminal block,
as shown in Figure 2-3. The –48, –48RTN, and CHS GND connections providing –48VDC
power to the system require a minimum of number 10AWG wire for the 24A-rated load. The
terminal block is rated to accept up to number 8AWG solid wire. The use of ferrules to terminate
these wires is recommended.
The alarm circuit connection to the DC power tray is provided by a smaller 3-position terminal
block, also shown in Figure 2-3. The COM, NO, and NC connections providing the circuit
breaker alarm indication should be wired with number 22AWG or larger wire. The use of number
6 spade or ring lug terminals for these connections is recommended.
Obtain a slot-tip screwdriver for securing the system power terminals and a Phillips screwdriver
for securing the alarm circuit terminals.