Dell R720XD owner manual Assembling The DC Input Power Wires

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 52. 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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