Wiring Instructions For Dc Psu; Removing Dc Power Supply Unit - Dell XC720xd Owner's Manual

Wiring instructions for DC PSU

Your system supports up to two –(48–60) V DC PSUs (when available).
WARNING: For equipment using –(48–60) V DC PSU, a qualified electrician must perform all
connections to DC power and to safety grounds. Do not attempt connecting to DC power or
installing grounds yourself. All electrical wiring must comply with applicable local or national
codes and practices. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow all safety instructions that came with the product.
CAUTION: Wire the unit with copper only, unless otherwise specified, use only 10 American Wire
Gauge (AWG) wire rated minimum 90 ºC for source and return. Protect the –(48–60) V DC (1
wire) with a branch circuit over-current protection rated 50 A for DC with a high interrupt
current rating.
CAUTION: Connect the equipment to a –(48–60) V DC supply source that is electrically isolated
from the AC source (reliably grounded –(48–60) V DC SELV source). Make sure that the –(48–60)
V DC source is efficiently secured to earth (ground).
NOTE: A readily accessible disconnect device that is suitably approved and rated shall be
incorporated in the field wiring.
Input Requirements
• Supply voltage: –(48–60) V DC
• Current consumption: 32 A (maximum)
Kit Contents
• Dell part number 6RYJ9 terminal block or equivalent (1)
• #6-32 nut equipped with lock washer (1)
Required Tools
Wire-stripper pliers capable of removing insulation from size 10 AWG solid or stranded, insulated copper
wire
NOTE: Use alpha wire part number 3080 or equivalent (65/30 stranding)
Required Wires
• One UL 10 AWG, 2 m maximum (stranded) black wire [–(48–60) V DC]
• One UL 10 AWG, 2 m maximum (stranded) red wire (V DC return)
• One UL 10 AWG, 2 m maximum green or yellow, green with a yellow stripe, stranded wire (safety
ground)

Removing DC power supply unit

WARNING: For equipment using –(48–60) V DC power supplies, a qualified electrician must
perform all connections to DC power and to safety grounds. Do not attempt connecting to DC
power or installing grounds yourself. All electrical wiring must comply with applicable local or
national codes and practices. Damage due to servicing that is not authorized by Dell is not
covered by your warranty. Read and follow all safety instructions that came with the product.
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