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Connect the EX4400 to Power

Connect Earth Ground to an EX4400 Switch

Before you connect earth ground to a EX4400 switch, ensure that you have the following parts and tools available:

  • Grounding cable: 14 AWG (1.5 mm²), minimum 90° C wire, or as permitted by the local code—not provided

  • Grounding lug: Panduit LCD10-10AF-L or equivalent—not provided

  • Screws to secure the grounding lug: Two 10-32 x .25 in. screws with #10 split-lock washers—not provided

  • Number 2 Phillips (+) screwdriver—not provided

  • An electrostatic discharge (ESD) grounding strap—not provided

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect the switch to earth ground before you connect power to the switch.

You must install the EX4400 in a restricted-access location and ensure that the chassis is always properly grounded. EX4400 switches have a 2-hole protective earthing terminal on the rear panel. Under all circumstances, use this grounding connection to ground the chassis. If additional grounding methods are available, you can use those methods also. For example, you can use the grounding wire in the AC power cord or use the grounding terminal or lug on a DC power supply. EX4400 switches are tested to meet or exceed all applicable electromagnetic compatibility (EMC) regulatory requirements with the 2-hole protective grounding terminal connected correctly as described in this topic.

CAUTION:

Ensure that a licensed electrician has attached the appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the switch.

To ground the EX4400:

  1. Connect one end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
  2. Place the grounding lug attached to the grounding cable over the protective earthing terminal on the rear panel (see Figure 1).
    Figure 1: Connect a Grounding Cable to an EX4400 SwitchConnect a Grounding Cable to an EX4400 Switch
  3. Secure the grounding lug to the protective earthing terminal with the screws.
  4. Dress the grounding cable. Be sure that it does not touch or block access to other switch components.
    Warning:

    Ensure that the cable does not drape where people could trip over it.

Connect AC Power to an EX4400 Switch

Before you connect AC power to the switch:

  • Ensure that you have a power cord appropriate for your geographical location available.

  • Ensure that you have the power cord retainer shipped with the switch.

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

  • Ensure that you have an ESD grounding strap (not provided).

  • Ensure that you have connected the switch chassis to earth ground.

    CAUTION:

    Before you connect power to the switch, a licensed electrician must attach a cable lug to the grounding cable that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit).

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it to power (see Connect Earth Ground to an EX4400 Switch).

  • Ensure that you provide an external certified circuit breaker (2-pole circuit breaker or 4-pole circuit breaker based on your device) rated minimum 13 A, 16 A, or 20 A in the building installation or as per local electrical code.

We ship the EX4400 switches with one power supply preinstalled on the rear panel. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running: You can remove and replace either one of them without powering off the switch or disrupting switch functions.

To connect power to an EX4400 switch with an AC power supply:

  1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to a site ESD point.
  2. Ensure that the power supplies are fully inserted in the chassis.
  3. Locate the power cord or cords shipped with the switch; the cords have plugs appropriate for your geographical location.
    Warning:

    Ensure that the power cord does not block access to device components or drape where people can trip on it.

  4. Push the end of the retainer strip into the hole below the inlet on the power supply faceplate until it snaps into place. Ensure that the loop in the retainer strip points upward (see Figure 2).
    Figure 2: Connect Retainer StripConnect Retainer Strip
  5. Press the small tab on the retainer strip to loosen the loop. Slide the loop until you have enough space to insert the power cord coupler into the inlet.
  6. Insert the power cord coupler firmly into the inlet.
  7. Slide the loop toward the power supply until it is snug against the base of the coupler.
  8. Press the tab on the loop and draw out the loop into a tight circle (see Figure 3).
    Figure 3: Connect Power to an EX4400 Switch with an AC Power SupplyConnect Power to an EX4400 Switch with an AC Power Supply
  9. If the AC power source outlet has a power switch, set it to the off position.
  10. Insert the power cord plug into the AC power source outlet. The EX4400 switch powers on as soon as power is provided to the power supply. There is no power switch on the EX4400.
  11. If the AC power source outlet has a power switch, set it to the on position.
  12. Verify that the OUT.OK LED on the power supply is lit steadily green. If it is not, disconnect the power supply from the power source, and replace the power supply (see Maintain the EX4400 Power System).
    CAUTION:

    Do not remove the power supply until you have a replacement power supply ready: you must install the replacement power supply within one minute after removing the failed power supply to ensure proper airflow and prevent chassis overheating.

Connect DC Power to an EX4400 Switch

Before you connect DC power to the switch:

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

  • Ensure that you have connected the switch chassis to earth ground.

    CAUTION:

    Before you connect power to the switch, a licensed electrician must attach a cable lug to the grounding cable that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit).

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it to power (see Connect Earth Ground to an EX4400 Switch).

Ensure that you have the following parts and tools available:

  • DC power source cord with a connector—provided

  • Number 2 Phillips (+) screwdriver—not provided

  • An ESD grounding strap—not provided

We ship the EX4400 switches with one power supply preinstalled on the rear panel. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running: You can remove and replace either one of them without powering off the switch or disrupting switch functions.

Note:

You must connect the battery returns of the DC power supply to frame ground.

To connect power to an EX4400 switch with a DC power supply:

  1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to a site ESD point.
    CAUTION:

    The connection between each power source and power supply must include a circuit breaker.

  2. Ensure that the input circuit breaker is open so that the voltage across the DC power source cord leads is 0 V and that the cord leads do not become active while you are connecting DC power.
  3. Ensure that the power supplies are fully inserted in the chassis.
  4. Insert the power cord coupler firmly into the inlet and tighten the screws on the coupler by using the screwdriver (see Figure 4).
    Figure 4: Connect Power to an EX4400 Switch with a DC Power SupplyConnect Power to an EX4400 Switch with a DC Power Supply
  5. Connect the power cord to the power source. The EX4400 switch powers on as soon as power is provided to the power supply. There is no power switch on the EX4400.

    We’ve designed the EX4400 switch to operate with a DC power supply that has a single, nonredundant feed input. For source redundancy, you must install two DC power supplies in the EX4400; connect one source to one power supply and connect another source to the second power supply. This configuration provides the commonly deployed feed redundancy for the system.

  6. Close the input circuit breaker.
  7. Verify that the DC.OK LED on the power supply is lit steadily green. If it is not, disconnect the power supply from the power source, and replace the power supply (see Maintain the EX4400 Power System).
    CAUTION:

    Do not remove the power supply until you have a replacement power supply ready: you must install the replacement power supply within one minute after removing the failed power supply to ensure proper airflow and prevent chassis overheating.