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Connect the EX4400 to Power

Connect Earth Ground to an EX4400 Switch

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect the EX4400 switch to earth ground before you connect power to the switch. You must use the protective earthing terminal on the switch chassis to connect the switch to earth ground (see Figure 1).

You must install the EX4400 switch in a restricted-access location and ensure that the chassis is always properly grounded. EX4400 switches have a 2-hole protective grounding terminal on the rear panel of the chassis. Under all circumstances, use this grounding connection to ground the chassis. For AC-powered systems, you must also use the grounding wire in the AC power cord along with the two-hole grounding lug connection. This tested system meets or exceeds all applicable EMC regulatory requirements with the two-hole protective grounding terminal.

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.

Before you connect earth ground to a EX4400 switch, ensure that you have the parts and tools listed in Table 1 available:

Table 1: Parts Required for Connecting an EX4400 Switch to Earth Ground
Item Switch Model Description
Earthing terminal location

All EX4400 switches

 Rear panel of the chassis
Grounding cable requirements EX4400 switches shipped before March 2023 14 AWG (1.5 mm²), minimum 90° C wire, or as permitted by the local code—not provided
EX4400 switches shipped from March 2023 8 AWG (6 mm²), minimum 90° C wire, or as permitted by the local code—not provided
Grounding lug specifications EX4400 switches shipped before March 2023 Panduit LCD10-10AF-L or equivalent—not provided
EX4400 switches shipped from March 2023 Panduit LCD8-10AF-L or equivalent—not provided
Screws to secure the grounding lug All EX4400 switches Two 10-32 x .25 in. screws with #10 split-lock washers—not provided
Tools required All EX4400 swiches

Number 2 Phillips (+) screwdriver—not provided

Electrostatic discharge (ESD) grounding strap—not provided

To ground the EX4400 switch:

  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 based on your device current rating) 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 (CBL-JNP-PWR-DSUB)—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. You can install up to two power supplies in the switch. You must order the second power supply and a power source cord separately. 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 the power supplies 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.