Dell PowerEdge R420xr Carrier Grade Updates for Dell PowerEdge R720, R620, and - Page 2

DC Power Supply Earthing Guidelines WARNING: Systems using -(48-60) V DC power supplies may have a connection between the earthed conductor of the DC power supply circuit and the earthing conductor. • The system must be connected directly: - to the DC power supply system earthing electrode conductor or, - to a bonding jumper from an earthing terminal bar or bus to which the DC power supply system earthing electrode conductor is connected. • The system must be located in the same immediate area (for example, adjacent cabinets) as any other equipment that has a connection between the earthed conductor of the same DC power supply circuit and the earthing conductor, and the point of earthing of the DC system. The DC system must not be earthed elsewhere. • The DC source must be located within the same premises as the equipment. • Switching or disconnecting devices must not be in the earthed circuit conductor between the DC source and the point of the connection of the earthing electrode conductor. Fan Installation A qualified technician should be able to hot-swap a fan in 15 minutes or less. © 2012-2014 Dell Inc.