Preparing Delta and Wye Three-Phase Power Cords
A QFX3008-I Interconnect device can be configured with two three-phase wiring trays. Delta and wye wiring configurations are available. A licensed electrician must prepare the power cords that you provide for installation in the wiring tray. Several parts included with the wiring trays enable the power cords to be dressed in different positions. If you need the power cable to be routed up to the top of a rack, you must use the included 90° connector to enable the power cord to be routed upward (see Figure 1). The 90° connector provides more flexibility to position the power cord outside the width of the chassis. Alternatively, if the power cords will be routed down to the bottom of the rack, or space limitations prevent you from extending the width of the chassis footprint, you can use the flat connector to install the power cord (see Figure 2). Figure 3 and Figure 4 show the power cords installed on the wiring trays in the two different positions. Figure 5 shows the wiring tray being installed in the chassis, using the flat connector.
Mixing different types of wiring trays in the same chassis is not a supported configuration.
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, a QFX3008-I Interconnect device must be adequately grounded before it is connected to power.
For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the QFX3008-I Interconnect device to connect to earth ground. For instructions on connecting a QFX3008-I Interconnect device to ground using a separate grounding conductor, see Connecting Earth Ground to a QFX3008-I Interconnect Device.
A QFX3008-I Interconnect device receives additional grounding when you plug the wiring tray in the device into a grounded AC power outlet by using the AC power cord appropriate for your geographical location. See AC Power Cord Specifications for a QFX3008-I Interconnect Device with Three-Phase Delta Wiring Trays or AC Power Cord Specifications for a QFX3008-I Interconnect Device with Three-Phase Wye Wiring Trays.
Each wiring tray must be connected to a dedicated AC power source outlet.
Before you begin to prepare the wiring trays for installation:
Ensure that you understand how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.
Ensure that you have the following parts and tools available to prepare the wiring trays for installation:
Electrostatic discharge (ESD) grounding strap
Phillips (+) screwdriver, number 2
Power cords appropriate for your wiring trays and geographical location. See AC Power Cord Specifications for a QFX3008-I Interconnect Device with Three-Phase Delta Wiring Trays or AC Power Cord Specifications for a QFX3008-I Interconnect Device with Three-Phase Wye Wiring Trays.
Ensure that the power cords do not block access to device components or drape where people can trip on them.
To prepare three-phase power cords for installation:
- Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
- Ensure that the power cords are not connected to power outlets. Switch off the customer site circuit breakers. Ensure that the voltage across the AC power source is 0 V and that there is no chance that the voltage might become active during installation.
- Remove a wiring tray from the chassis. See Removing a Wiring Tray from a QFX3008-I Interconnect Device.
- Flip the breaker on the wiring tray faceplate to the OFF (O) position.
- Using a number 2 Phillips (+) screwdriver, loosen and remove the screws and washers that hold the square flat connector to the wiring tray. Keep the screws and washers.
- Depending on how you want to dress the power cords, decide whether to use the 90° connector to attach the power cord to the wiring tray or the square flat connector that you removed in Step 5.
- Insert the power cord in the wire strain relief by compressing the wire strain relief to enlarge the opening. Pull enough cord through the strain relief to allow easy wiring connections to the terminal block.
- Remove first the plastic, then the metal retaining nuts from the wire strain relief, and place either the 90° connector or flat connector over the threaded portion of the wire strain relief as shown in Figure 1 or Figure 2.
- Screw first the metal, then the plastic retaining nuts on the threaded portion of the wire strain relief to complete the assembly.
- Route the wiring through the
hole in the wiring tray, and using a number 2 Phillips (+) screwdriver,
attach the connector to the wiring tray using the screws and washers
you removed in Step 5.
If you are ready to make the wiring connections to the terminal block, see Connecting AC Power to a QFX3008-I Interconnect Device with Three-Phase Delta Wiring Trays or Connecting AC Power to a QFX3008-I Interconnect Device with Three-Phase Wye Wiring Trays.
- Repeat Step 3 through Step 10 for the other wiring tray.