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DC Power Cable Specifications

Figure 68 shows a typical DC source cabling arrangement.

Figure 68: Typical DC Source Cabling to the Services Gateway

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The DC power supplies in PEM0 and PEM1 must be powered by dedicated power feeds derived from feed A, and the DC power supplies in PEM2 and PEM3 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.

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

For a description of the DC power supply, see , as opposed to the DC power configuration (see DC Power Supply for more information) For instructions on connecting the DC power and grounding cables during initial installation, see Connecting Power to a DC-Powered Services Gateway. For instructions on replacing a DC power cable, see Replacing a DC Power Supply Cable.


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