4.4.2 Wire and Lug Preparation
Before performing any installation actions, ensure power is removed from DC circuits by turning off the
power line servicing the circuits. Prepare the stranded wiring before you begin a DC power installation.
1. Stranded copper wiring is required.
• Commercially available 1 to 2 AWG wire is recommended for installations in the U.S.
• Wire size should meet local and national installation requirements.
• Grounding wires and grounding lugs are not supplied.
• Strip the wires to the appropriate length for the lugs.
The wires connecting the DC power supply to the power source must meet the following
requirements:
• DC Input Wire Size: 1– 2 AWG
• Primary Ground Wire Size: 1– 2 AWG per power supply.
• The conductors are copper
2. Use agency-approved compression (pressure) lugs for wiring terminations (2x - Two M6 studs with
5/8" spacing).
3. Slip on heat-shrink tubing on the wire ends before assembling the lugs on to the wire.
• The lugs must be crimped with the proper tool.
• The tubing should extend over the lug’s barrel and the wire's insulator.
4. Shrink the tubing with a heat gun.
Figure 19: Lugs Wiring Terminations
1 Insulated wire 3 Lug 5 Half-inch width
2 Heat-shrink tubing 4 Quarter-inch diameter hole 6 Five-eighth-inch apart centers
4.5 Power Supply Specifications
The Table 8: Power Supply Specifications (each PSU) shows the power supply specifications for each
of the PSUs supported.
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