Juniper Networks MX240 manual DC Power Cable Specifications

MX240 Ethernet Services Router Hardware Guide

DC Power Cable Specifications

Figure 62 on page 170 shows a typical DC source cabling arrangement.

Figure 62: Typical DC Source Cabling to the Router

The DC power supply in PEM0 must be powered by dedicated power feeds derived from feed A, and the DC power supply in PEM2 must be powered by dedicated power feeds derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.

CAUTION: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–)to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.

WARNING: For field-wiring connections, use copper conductors only.

For other electrical safety information, see “Electrical Safety Guidelines and

Warnings” on page 144.

CAUTION: Power cords and cables must not block access to router components or drape where people could trip on them.

For a description of the DC power supply, see “DC Power Supply” on page 23. For instructions on connecting the DC power and grounding cables during initial installation, see “Connecting Power to a DC-Powered Router” on page 56. For instructions on replacing a DC power cable, see “Replacing a DC Power Supply Cable” on page 119.

170■ DC Power Specifications and Requirements