Connecting the NFX250 to Power
Connecting Earth Ground to an NFX250 Device
Earth grounding is recommended, but optional for the NFX250 device. The device functions normally without earth grounding. Electromagnetic Compatibility (EMC) and Electrostatic Discharge (ESD) requirements are met by the device chassis. The AC power cord provides surge protection.
To connect NFX250 device to earth ground, you must use the protective earthing terminal on the device chassis. See Figure 1.
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— |
| Phillips (+) |
Connecting Earth Ground to an NFX250 Device
To connect earth ground to a device:
- Connect one end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
- 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 
- Secure the grounding lug to the protective earthing terminal with the washers and screws.
- 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
The power supply in an NFX250 device is located on the rear panel.
Ensure that you have the following parts and tools available:
A power cord appropriate for your geographical location
A power cord retainer clip
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).
To connect AC power to the device:
- 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.
- 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.
- Insert the coupler end of the power cord into the AC power cord inlet on the rear panel.
- 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.
- If the AC power source outlet has a power switch, set it to the OFF (0) position.
- Insert the power cord plug into an AC power source outlet.
- If the AC power source outlet has a power switch, set it to the ON (|) position.
The retainer brackets on your switch might be above and below the power inlet rather than on either side.
