Installing the Power Supply

Follow these instructions to install the power supply on a NF panelboard. The installation is illustrated in Power Supplies on Standard and Column-width Panelboards.

DANGER

hazard of electric shock, explosion, or arc flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS or CSA Z462 or local equivalent. Electrical equipment must be installed, operated, serviced, and maintained only by qualified personnel. Turn off all power supplying the panelboard interior and the equipment in which it is installed before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Replace all devices, doors, and covers before turning on power to this equipment. Before energizing panelboard, all unused spaces must be filled with blank fillers. Failure to follow these instructions will result in death or serious injury.

WARNING: This product can expose you to chemicals including nickel compounds, which are known to the State of California to cause cancer, and Bisphenol A (BPA), which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

1. Disconnect all power to the panelboard.

2. Remove the panelboard cover and deadfront. Verify that power is off using a properly rated voltage sensing device.

3. Insert the power supply’s bus connectors into the vertical bus connections on the left control bus (see Figure 1).

   NOTE: If a standard NF panelboard is used, the power supply is installed at the top of the left control bus. If a column-width panelboard is used, the power supply is installed at the bottom of the panelboard (see Power Supplies on Standard and Column-width Panelboards).

4. Push the power supply onto the control bus until the mounting feet snap onto the panelboard mounting rail.

   Power Supply Installation

   
   NOTE: Red power wire is only available on power supplies NF120PSG3L, NF240PSG3L, and NF277PSG3L.

5. After installing the power supply, the line terminal will line up with the hole on the panelboard interior bus bar. Use a screwdriver to secure the line terminal, torquing the screw 20–30 lb-in. (2.3 N•m).

6. Connect the power supply’s white neutral wire to the panelboard neutral bar assembly.

7. When installing power supply NF120PSG3L, NF240PSG3L, or NF277PSG3, connect the red wire to the external power source and the white neutral wire to the panelboard neutral bar assembly. The neutral side of the remote power source to the panelboard neutral bar assembly must also be connected.

   Power Supplies on Standard and Column-width Panelboards