Installing Power Modules | 23Figure 5-2. DC PEM LocationsDC RequirementsRedundancyFor full facility redundancy, install two DC PEMs where each PEM must be attached to an independentpower source with a dedicated circuit breaker sized in accordance with your local building and electricalsafety codes.Cable and Connector RequirementsYou must provide your own cables to connect to a remote power source (a circuit breaker panel, forexample) in your equipment rack or facility. Cables must be sized to meet the following criteria:• Rated for 60A service to allow for a fully loaded E300 system per NEC in the United States orinternationally, per local safety codes.• Limit voltage drop across the cable length to 0.5V or less.Before you make the cable connections, apply a coat of anti-oxidant paste to unplated metal contactsurfaces. File unplated connectors, braided straps, and bus bars to a shiny finish. It is not necessary to fileand coat tinned, solder-plated, or silver-plated connectors or other plated connection surfaces, such asthose on the PEM studs.NOTE: Please take precautions against over-tightening the screws or nuts on this device.Maximum Power Dissipation 2400WMaximum DC PEM Input Current 60AOptional GroundingHolesfn00121cHHAir FilterDC Power SupplySlot 0DC Power SupplySlot 1