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A Completed Main Breaker Interlock Kit Installation on an Existing GE Circuit Breaker Panel

Interlock Kit on a GE Main Breaker

Dear Mr. Electrician: How can I install a Generator Interlock Kit on my existing GE main circuit breaker panel so that I can connect a portable generator to it safely? Answer: You first must determine if you have the needed circuit breaker spaces for a generator circuit breaker in your main electrical panel.  Usually two, but sometimes three spaces are needed to accommodate the interlock kit.  Some existing circuit breakers near the main will need to be moved to make room for the generator breaker.  Then you need to order the correct generator interlock kit that is approved for your circuit breaker panel. On newer electrical panels many manufacturers make an accessory interlock kit.  If you read the labeling inside of the panel carefully you should see a part number for the interlock kit for your panel.  If your main circuit breaker panel is older you might be able to obtain a third party manufacturer interlock kit.  The interlock kit shown on this post was made and sold by InterlockKit.com.  The photos below depict the interlock kit installation onto a GE main circuit breaker panel that was originally installed in the 1980's.  NOTE: Text links below go to applicable products on Amazon.com Main Breaker Interlock Kit Installation on a GE Load Center Before beginning the job of installing an interlock kit on an existing main electrical panel, you should apply for an electrical permit at your local building department.  Include a copy of the interlock kit installation instructions with your permit application.  I always include a brief one page description of the work being done with my permit applications if I cannot fit all of the information on the permit application form. Wording such as "Electrical work consists of the installation of a third party manufactured interlock kit on an existing 150 amp, 30 circuit GE main electrical panel.  A new 50 amp sub-panel is to be installed for relocated circuits.  Generator inlet to be installed outside next to garage door."  is something that I probably used with the permit application for the installation depicted in this post. I had a permit application for an interlock kit installation rejected once.  After I submitted the paperwork, I received a call from the electrical sub-code official.  He said that the state was no longer accepting the laboratory testing results of the third party interlock kit.  Consequently I was not allowed to install that particular interlock kit as it would never pass inspection. I contacted the manufacturer and it was confirmed that my state was the only one that was no longer accepting the laboratory testing results from this one particular testing laboratory.  The testing laboratory had stopped doing electrical testing, but their previous tests were good.  My state would no longer accept even the previously accepted testing.  The manufacturer said that they were in the process of paying to have all of their products retested by another testing laboratory that my state would accept. Three circuit breaker spaces in the top right side position are required for an interlock...