Home Tags Reliance PB30 Generator Inlet

Tag: Reliance PB30 Generator Inlet

Reliance PB30 Generator Inlet

Square D generator sub-panel completed and labeled

Generator Sub-Panel Installation

Dear Mr. Electrician: What is required for a generator sub-panel installation?  I want to have a generator sub-panel for circuits in my house such as the furnace, the sump pump, and the refrigerator. Answer: Requirements for a generator sub-panel installation vary and there are a several types of generator sub-panels available.  NOTE: Some text links below go to applicable products on Amazon.  As an Amazon Associate I earn from qualifying purchases. Some types of generator sub-panels come pre-wired from the factory and it is just a matter of connecting the flexible conduit to the main electrical panel and then making all of the electrical connections as per the instructions.  That type of sub-panel can only be used directly adjacent to the main electrical panel and has limited circuits. Another type of installation utilizes a standard electrical load center as a generator sub-panel for some previously selected circuits to be powered when the generator is on.  Below are photos of a generator sub-panel installation using a Square D generator sub-panel which included two main breakers, an interlock kit, and a circuit breaker hold down kit. As with any new electrical installation, an electrical permit must be obtained from the town building department.  Submit a copy of the sub-panel instructions and specifications with your permit application.  Also include information about an interlock kit if one will be used and where the sub-panel will be located. If you plan to use an interlock kit made by a third party be sure that it has a testing laboratory approval such as Underwriter's Laboratories (UL).  Interlock kits made by the electrical panel manufacturer will have this approval. If the installation is a little out of the ordinary or if you have questions about code compliance, you can also include photos of the new generator sub-panel location with your permit application, as well as the existing electrical service and main electrical panel. I usually include a one page typed "Scope of Work" that gives a brief description of the work to be done and some of the materials used. It is best to provide as much clear and concise information as possible with your permit application so that the inspector has a full understanding of the work being done before hand.  Better to find out ahead of time if the installation will be code compliant rather than after the work is done and your work fails inspection. Some of the applicable articles from the National Electrical Code concerning the installation of generator sub-panels are: 210, 230, 250, 300, 310, 314, 334, 445, and 702. PORTABLE GENERATOR SUB-PANEL INSTALLATION I have found that some finished basements have made the main electrical panel inaccessible for future renovations and sometimes even for repairs.  The Cutler Hammer load center depicted here was boxed in by the wall that was erected in the basement.  Fortunately it was not totally enclosed. I was able to remove the cables of the circuits to be relocated into the generator sub-panel from the top of the main electrical panel and fish them into the ceiling above.  There...
Installed Interlock kit on a Cutler Hammer Circuit Breaker Panel

CH Generator Interlock Kit

Dear Mr. Electrician:  How do I install a main breaker CH generator interlock kit on my main electrical panel? Answer:  A main breaker CH 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.  As an Amazon Associate I earn from qualifying purchases. 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....