Dell External OEMR R620 Owner's Manual page 75

3. Connect the safety ground wire to the grounding post on the back of the system using a #6-32 nut equipped with a
locking washer.
Figure 33. Assembling and Connecting the Safety Ground Wire
1. safety ground wire
2. grounding post
3. locking washer
4. spring washer
5. #6-32 nut
Assembling The DC Input Power Wires
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.
1. Strip the insulation from the ends of the DC power wires, exposing approximately 13 mm (0.5 inch) of copper wire.
WARNING: Reversing polarity when connecting DC power wires can permanently damage the power supply or the
system.
2. Insert the copper ends into the mating connectors and tighten the captive screws at the top of the mating
connector using a #2 Phillips screwdriver.
WARNING: To protect the power supply from electrostatic discharge, the captive screws must be covered with the
rubber cap before inserting the mating connector into the power supply.
3. Rotate the rubber cap clockwise to fix it over the captive screws.
4. Insert the mating connector into the power supply.
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