8 Safe ty Instr uctionsw w w . d e l l . c o m | s u p p o r t . d e l l . c o m• Do not step on or stand on any component when servicing other components in arack.CAUTION: A qualified electrician must perform all connections to DC power andto safety grounds. All electrical wiring must comply with applicable local ornational codes and practices.CAUTION: Never defeat the ground conductor or operate the equipment in theabsence of a suitably installed ground conductor. Contact the appropriateelectrical inspection authority or an electrician if you are uncertain thatsuitable grounding is available.CAUTION: The system chassis must be positively grounded to the rack cabinetframe. Do not attempt to connect power to the system until grounding cablesare connected. Completed power and safety ground wiring must be inspected bya qualified electrical inspector. An energy hazard will exist if the safety groundcable is omitted or disconnected.Modems, Telecommunications, or Local Area Network Options• Do not connect or use a modem during a lightning storm. There may be a risk ofelectrical shock from lightning.• Never connect or use a modem in a wet environment.• Do not plug a modem or telephone cable into the network interface controller (NIC)receptacle.• Disconnect the modem cable before opening a product enclosure, touching orinstalling internal components, or touching an uninsulated modem cable or jack.When Working Inside Your SystemProtecting Against Electrostatic DischargeStatic electricity can harm delicate components inside your system. To prevent staticdamage, discharge static electricity from your body before you touch any of the electroniccomponents, such as the microprocessor. You can do so by periodically touching anunpainted metal surface on the chassis.You can also take the following steps to prevent damage from electrostatic discharge(ESD):Caution: Safety Instructions