Connecting AC Power Cables

Procedure

1. Turn off the power source to which the power cables need to be connected.
2. Measure the distance that the power cables will go through, and cut the AC power cables into an appropriate length according to the measured length.
3. Identify wires of the power cables, attach temporary labels to both ends of each power cable, and write numbers on the labels. For details on how to number the cables, see Engineering Labels for AC Power Cables.

   By default, 3-wire AC power cables (with brown, blue, and yellow-green wires) are delivered. Connect the brown wire to the L terminal, blue wire to the N terminal, and the yellow-green to the ground terminal. Different AC power cables may be delivered in compliance with local regulations or customer requirements.

4. (Only for power cables outside the cabinet) Route the power cables along the planned paths. Arrange the power cables from the power distribution frame (PDF) into a bundle and route them to the cabinet along the cable tray. Lead the power cables into the cabinet from the left side.

   • To connect cables in the cabinet more conveniently, you can remove the side panels of the cabinet before connecting cables.

   • Use appropriate force on the cables. Dragging cables with too much force may damage the cables.

5. Wear an ESD wrist strap or a pair of ESD gloves. When wearing an ESD wrist strap, insert the other end to the ESD jack of a device and ensure that the device is reliably grounded.
6. Connect power cables to power modules.
   1. Connect the plug of an AC power cable to the power socket on the corresponding power module. See callout 1 in Figure 9-12.
   2. Secure the power cable plug with the locking latch or locking strap on the AC power module. See callout 2 and callout 3 in Figure 9-12.

      An 800 W AC power module has a locking latch, and a 2200 W AC power module has a locking strap.

   Figure 9-12 Connecting a power cable to a power module
   

7. Connect power cables to the power distribution box or PDF.
   • If a power distribution box is used, connect power cables to the power distribution box and then to the PDF.

     Follow these rules to route the power cables:

     • Cables at the rear of the AC power distribution box: routed from top to bottom
     • Cables at the bottom of the AC power distribution box: routed from rear to front
     • Cables at the front of the AC power distribution box: routed from bottom to terminals
   • If no power distribution box is used, connect power cables to the PDF directly.

   Generally, power terminals on the power distribution box and PDF are cord end terminals or OT terminals.

   • If OT terminals are used:
     1. Place the required power cables near the power distribution box or PDF.
     2. (Optional) Cut off redundant cables according to the required length, and then crimp OT terminals on the cable ends.
     3. Use the Phillips screwdriver to loosen the screws on the power terminals, take off the screws and washers, and save them for later use. See Figure 9-13.
        Figure 9-13 Removing screws from power terminals
        
     4. Connect wires of power cables to the corresponding power terminals. Put the screws through the washers and OT terminals on the power cables, and then tighten the screws. See Figure 9-14.

        • Connect a brown wire (live wire) to an L terminal.

        • Connect a blue wire (neutral wire) to an N terminal.

        • Connect a yellow-green wire (earth wire) to a PE terminal.

        Figure 9-14 Securing power cables with screws
        
   • If cord end terminals are used:
     1. (Optional) Cut off redundant cables according to the required length, and then crimp cord end terminals on the cable ends.
     2. Loosen the screws on the power terminals to which the power cables will be connected (retain the screws on the terminals). See Figure 9-15.
        Figure 9-15 Loosening screws on power terminals
        
     3. Insert the cord end terminals of power cables to the power terminals, and then tighten the screws. See Figure 9-16.
        Figure 9-16 Securing power cables with screws
        

8. Arrange and bundle the power cables on the left side of the cabinet. See Figure 9-17.
   Figure 9-17 Bundling power cables
   

   • Route power cables from the left side of the cabinet and bundle them with cable ties at 200-mm intervals. Do not bundle power cables at the bent part. See Figure 9-17.

   • Bundle power cables with appropriate stress. Ensure that power cables are not crossed or twisted.