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Installed Interlock kit on a Cutler Hammer Circuit Breaker Panel

Main Breaker Generator Interlock Kit

Dear Mr. Electrician:  How do I install a main breaker generator interlock kit on my main electrical panel? Answer:  A main breaker generator interlock kit is great if you want to supply power to your entire circuit breaker panel and can be an economical choice compared to installing a separate external transfer switch.  NOTE: Some text links below go to applicable products sold on Amazon and EBay. Below are step by step photos depicting a main breaker interlock kit installation on an older Cutler Hammer main circuit breaker panel.  On the last page is a short YouTube video of this installation. Before beginning the work of installing an interlock kit on your main electrical panel, you should obtain an electrical permit from your town's building department.  Submit a copy of the interlock kit installation instructions with your permit application.  In addition I always write a short "Scope of Work" and include that with my permit applications so that the inspector has a clear understanding of the work being done before hand. I had submitted documentation about the interlock kit and the PB30 generator inlet along with my application for an electrical permit for this job.  I also made a simple drawing depicting the location of the generator inlet in relation to the basement electrical panel.  The work was inspected by the town electrical inspector. When the work is completed you will arrange to have an electrical inspector look over the job to make sure that it is compliant with the electrical code.  This is very important to ensure that your installation is safe and not hazardous to someone connecting the generator during a power outage. HOW TO INSTALL A MAIN BREAKER GENERATOR INTERLOCK KIT Above is what the Cutler Hammer circuit breaker panel looked like prior to the installation of the interlock kit.  Fortunately there were five available spaces in this 30 circuit panel.  The interlock kit for this particular Cutler Hammer panel requires three spaces on the top right. To install a main breaker interlock kit you will need a few extra spaces in your main electrical panel as a two pole 30 amp or two pole 50 amp circuit breaker will need to be installed adjacent to the main breaker. The new two pole breaker will be connected to the incoming power from the portable generator.  Usually two or three spaces are required for the generator two pole circuit breaker. Main breaker generator interlock kits are available for many new electrical panels from the original manufacturer.  However for older electrical panels it is sometimes necessary to use an interlock kit from a third party manufacturer.  The interlock kit depicted in the photos on this page is from a third party manufacturer (www.interlockkit.com).  It is approved by a certified testing laboratory for use on this particular electrical panel. The homeowner had typed up a panel directory for most of the circuits years before this installation.  It came in handy when identifying critical circuits to run off of the portable generator.  A circuit tracer is handy for tracking down circuits...