Portable Generator Flanged Inlet and Interlock Device

When the power goes out, having a backup generator can keep essential appliances and devices running. While many homeowners rely on extension cords to connect their portable generator to individual appliances, a safer and more efficient method is to connect the generator directly to the home’s electrical system. This can be done using a flanged inlet and an interlock device, which provide a reliable way to power multiple circuits without the risks associated with backfeeding the grid.

How a Portable Generator Connects to Your Home

To connect a portable generator to your breaker box safely, two main components are required:

1. Flanged Inlet (Power Inlet Box)
   A flanged inlet, also called a power inlet box, is installed on the exterior of your home. This weatherproof outlet allows you to connect your generator via a heavy-duty power cord, safely transferring power from the generator to your electrical panel.

2. Interlock Device
   The interlock device is installed inside your main breaker panel and prevents the generator from backfeeding into the utility lines. This ensures that when the generator is running, the main breaker is off, and when the main breaker is on, the generator cannot be used. This is a crucial safety feature that protects both utility workers and your home’s electrical system.

How the System Works

1. Installation – A licensed electrician installs the flanged inlet on the exterior of your home and wires it to your main electrical panel. The interlock device is added to the breaker box to prevent simultaneous operation of the generator and the main power grid.

2. During a Power Outage

   • Plug your generator into the flanged inlet using a generator cord.
   • Start your generator and let it stabilize.
   • Switch off the main breaker to disconnect from the utility grid.
   • Engage the interlock device and turn on the breakers for the circuits you want to power.

3. Restoring Utility Power

   • When utility power is restored, turn off the generator.
   • Disconnect the generator from the flanged inlet.
   • Switch the main breaker back on to resume normal power usage.

Why Use a Flanged Inlet and Interlock Device?

• Safety – Prevents backfeeding and protects utility workers.
• Convenience – Powers multiple circuits without the need for extension cords.
• Cost-Effective – More affordable than a transfer switch while still meeting code requirements.
• Reliability – Ensures seamless switching between utility and generator power.

If you’re considering installing a portable generator connection, Grayzer Electric can help! Contact us to ensure a safe and professional setup tailored to your home’s needs.