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Connecting the NFX250 to Power

Connecting Earth Ground to an NFX250 Device

Electromagnetic Compatibility (EMC) and Electrostatic Discharge (ESD) requirements are met by the device chassis. The AC power cord provides surge protection.

You must install the NFX250 device in a restricted-access location and ensure that the chassis is always properly grounded. The NFX250 device has a two-hole protective grounding terminal provided on the chassis. See Figure 1. We recommend that you use this protective grounding terminal as the preferred method for grounding the chassis regardless of the power supply configuration. However, if additional grounding methods are available, you can also use those methods. 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. This tested system meets or exceeds all applicable EMC regulatory requirements with the two-hole protective grounding terminal.

This topic describes:

Parts and Tools Required for Connecting an NFX250 Device to Earth Ground

Table 1 lists the earthing terminal location, grounding cable requirements, grounding lug specifications, screws and washers required, and the screwdriver needed for connecting a device to earth ground. Before you begin connecting a switch to earth ground, ensure you have the parts and tools required for your device.

Table 1: Parts and Tools Required for Connecting an NFX250 Device to Earth Ground

Device

Earthing Terminal Location

Grounding Cable Requirements

Grounding Lug Specifications

Screws and Washers

Screwdriver

Additional Information

NFX250

Rear panel of chassis

14 AWG (2 mm²), minimum 90°C wire, or as permitted by the local code

Panduit LCC10-14BWL or equivalent—not provided

  • Two 10-32 x .25 in. screws with #10 split-lock washer—not provided

  • Two #10 flat washers—not provided

Phillips (+) number 2

Connecting Earth Ground to an NFX250 Device

To connect earth ground to a device:

  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. See Figure 1.

    Figure 1: Connecting a Grounding Cable to an NFX250 Device Connecting a Grounding Cable to an NFX250 Device

  3. Secure the grounding lug to the protective earthing terminal with the washers and screws.

  4. Dress the grounding cable and ensure that it does not touch or block access to other device components.

    Warning:

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

Connecting AC Power to an NFX250 Device

Ensure that you have the following parts and tools available:

  • A power cord appropriate for your geographical location

  • A power cord retainer clip

CAUTION:

NFX250 device gets additional grounding when you plug the power supply 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 an NFX250 Device).

The power supply in an NFX250 device is located on the rear panel.

To connect AC power to the device:

  1. Squeeze the two sides of the power cord retainer clip and insert the L-shaped ends of the wire clip into the holes in the bracket on each side of the AC power cord inlet on the rear panel.

    The power cord retainer clip extends out of the chassis by 3 in.

  2. Locate the power cord or cords shipped with the device; the cords have plugs appropriate for your geographical location. See AC Power Cord Specifications for an NFX250 Device.
    Warning:

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

  3. Insert the coupler end of the power cord into the AC power cord inlet on the rear panel.
  4. Push the power cord into the slot in the adjustment nut of the power cord retainer clip. Turn the nut until it is tight against the base of the coupler and the slot in the nut is turned 90° from the top of the device.
  5. If the AC power source outlet has a power switch, set it to the OFF (0) position.
  6. Insert the power cord plug into an AC power source outlet.
  7. If the AC power source outlet has a power switch, set it to the ON (|) position.
Note:

The retainer brackets on your switch might be above and below the power inlet rather than on either side.

Figure 2: Connecting an AC Power Cord to the AC Power Cord Inlet on NFX250 DeviceConnecting an AC Power Cord to the AC Power Cord Inlet on NFX250 Device

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