How to Install a Power Inlet Box

What You'll Need
Power Inlet Box
Wire Nuts

A power inlet box is an important gateway that allows the power from a generator to safely enter the inside of the house. Since generators emit a harmful fume, they need to be located outside the home. In order to allow the generator to safely power up the home, it is important to install a power inlet box safely outside. Here is how it is done.

Step 1 – Choosing a Suitable Location

Find a location outside the home that is at least five feet away from doors, windows and openings. Colorless fumes from the generator can enter the home through these openings, so be sure the hazardous fumes are far away as possible. Make sure that the installation location is about 2 feet or more above the ground as well.

Step 2 – Mounting the Power Inlet Box

Before mounting the unit, remove the front cover and the screws that secure it to the bottom plate. There are four or three holes at the back of the cabinet. Use these holes to mount the device to the wall using mounting screws provided with the unit. Apply a sealant around the screws to avoid having water penetrate the unit. Before proceeding with the wiring connections, make sure to turn off the circuit breaker first or remove the fuse from the fuse box, whichever is applicable.

Step 3 – Wiring Procedures

There are knockouts provided in the unit for the wiring. Use these knockouts to install the wiring in the unit. It is important to use only copper wire or the approved wiring material for the area. When using a conduit, drill a hole in the wall to allow it to enter the inside of the home and connect to the junction box. If a junction box has not yet been installed, install one near the transfer switch. Insert the conduit into the hole and the wiring into the conduit. Seal the hole afterwards with the sealant to prevent the entry of water.

Inside the power inlet box, attach the bare wire to the green lead and secure it with a wire nut. Connect the white wire to the nickel-plated screw and the hot wires to the terminals. Make sure to secure the connections with wire nuts.

With the wiring connected to the inlet already, extend the wire into the home towards the junction box. When connecting the wires in the junction box, follow the color coding (white to neutral, black to black, red to red). Connect the bare wire to the ground wire as well. Secure the connections using wire nuts and fold the wires inside the junction box.

Step 4 – Finishing the Installation

Fold the wires connected to the inlet, re-attach the bottom plate back in place, and secure it with the screws. Close the front cover as well. Turn on the circuit breaker and test the connection to see if it works.