Statement 31:DANGERElectrical current from power, telephone, and communication cablesis hazardous.To avoid a shock hazard:To Disconnect:1. Turn OFF all power sources and equipment that is tobe attached to this product.For ac systems, remove all power cords from thechassis power receptacles for interrupt power at theac power distribution unit.For dc systems, disconnect dc power sources at thebreaker panel or by turning off the power source.Then, remove the dc cables.2. Remove the signal cables from the connectors.3. Remove all cables from the devices.To Connect:1. Turn OFF all power sources and equipment that is tobe attached to this product.2. Attach signal cables to the product.3. Attach power cords to the product.For ac systems, use appliance inlets.For dc systems, ensure correct polarity of -48 V dcconnections: RTN is + and -48 V dc is -. Earthground should use a two-hole lug for safety.4. Attach signal cables to other devices.5. Connect power cords to their sources.6. Turn ON all the power sources.Do not connect or disconnect any cables or perform installation,maintenance, or reconfiguration of this product during an electrical storm.Connect all power cords to a properly wired and grounded power source.Connect to properly wired power sources any equipment that will be attached to this product.When possible, use one hand only to connect or disconnect signal cables.Never turn on any equipment when there is evidence of fire, water, or structural damage.Disconnect the attached ac power cords, dc power sources, network connections,telecommunications systems, and serial cables before you open the device covers,unless you are instructed otherwise in the installation and configuration procedures.Connect and disconnect cables as described in the following table whenyou install, move, or open covers on this product or attached devices.Statement 34:CAUTION:To reduce the risk of electric shock or energy hazards:• This equipment must be installed by trained service personnel in arestricted-access location, as defined by the NEC and IEC 60950-1,First Edition, The Standard for Safety of InformationTechnology Equipment.• Connect the equipment to a properly grounded safety extra lowvoltage (SELV) source. A SELV source is a secondary circuit thatis designed so that normal and single fault conditions do notcause the voltages to exceed a safe level (60 V direct current).• Incorporate a readily available approved and rated disconnectdevice in the field wiring.• See the specifications in the product documentation for therequired circuit-breaker rating for branch circuitovercurrent protection.• Use copper wire conductors only. See the specifications in theproduct documentation for the required wire size.• See the specifications in the product documentation for therequired torque values for the wiring-terminal screws.To install a 750-watt -48 V to -60 V dc power supply, complete the following steps:1. Touch the static-protective package that contains the power supply to anyunpainted metal surface on the server; then, remove the power supply fromthe package and place it on a static-protective surface.Chapter 6. Removing and replacing components 291
