60 amp sub panel @ detached garage. Will you get the same inspector for the entire job? The neutral in the garage panel must be isolated from the equipment ground bar, wires, and panel enclosure. More about Installing a Sub Panel Electrical Code for Conduit Fill It's one of the messier (or more confusing) sections of the code (IMHO.). The remote building is treated as a service from Table 250.66, Visual design changes to the review queues, Opt-in alpha test for a new Stacks editor. Yes, you need a grounding electrode (ground rod) local to the detached building. The last power pole to the house has a ground rod driven, and it is connected to the nuetral of the 3 wire feeder at the pole. I'm calling that the outbuilding GEC. Additional feeders or branch circuits shall be permitted for different voltages, frequencies, or phases. Suzie's house is fed from typical 120/240v 3 wire service. He said, "no, you don't need to because you are replacing the overhead existing triplex with quadplex 4 wire. Asking for help, clarification, or responding to other answers. If so am I supposed to attach the ground copper wire to the very small ground buss bar inside that sub-panel, and what size wire? You must log in or register to reply here. The International Residential Code, the most widely adopted building code in the U.S., does not require that detached garages be provided with electricity. The new garage is approx. The second rod should be driven a minimum of six feet away. Also bond (connect electrically) any water piping in the garage to the ground bar of the subpanel. 8 AWG might be acceptable given that the feed size is 10 AWG, but I'm having trouble tracking down the exact language where that is mentioned. I was surprised and asked him about that. When a feeder or more than one circuit is supplying the garage, a grounding electrode is required at the garage. Since we have no practical method of measuring the resistance to ground (an ohmmeter will not work) additional ground rod or rods would be a good practice. since this service is considered "Detached", it requires it's own ground rod. Combining expressions and text together in PlotLegends Mathematica. The house and shop only have 2 hots and a neutral running to the panel. I will be running 40 amps 240 volts out to my garage via underground 8-3 plus ground. L1, L2, and Neutral should connect to the box. https://petersonelectricllc.com/ We worked on installing an electrical panel in a detached garage for a customer. The neutral and ground are separated at the sub panel, do I need a grounding rod even though I am grounding back at the Main panel? I was planning on driving a ground rod when replacing overhead service to a detached garage. I am correct in the fact that the neutral and ground buss bars are not to be connected in a Sub panel? A detached structure with its own panel requires a GES, using two rods to make one is usually the easiest option. A detached building with a subpanel needs its own ground rod, regardless of if there are three wires or four wires feeding it. Electrical - AC & DC - Sub panel ground rod - I am getting ready to install a 100 amp sub panel in a detached garage about 100 feet from the house. Terminate the grounding electrode conductor from the ground rod (or Ufer electrode) at the subpanel location to the ground bar in the subpanel. You'll have 4 wires." Thanks for contributing an answer to Home Improvement Stack Exchange! I am aware that I dont bond neutral/ground in the sub-panel (they are bonded in the main house panel) Thank you, any advice appreciated. Yes, you need a grounding electrode (ground rod) local to the detached building. Making statements based on opinion; back them up with references or personal experience. 6 AWG solid is the default minimum size for a connector to a grounding electrode. Detached garage has a 4-wire feed to a 100-amp sub-panel. He said, "no, you don't need to because you are replacing the overhead existing triplex with quadplex 4 wire. I was talking to the elec inspector at the jobsite. The NEC says that if the ground rod does not have a resistance of 25 ohms or less to earth then a second ground rod is required. Plus the equipment grounding conductor (ground wire) accompanying and sized for the feed wires. JavaScript is disabled. I'm not going to go and look, but I don't recall where it says that if I run two separate branch circuits, fed from separate breakers back in the main panel, both with their own hot and neutral and a common ground that I need to drive ground rods. What makes Gaussian distributions special? 2014 NEC 250.64(B) Otherwise you can use #8 up to 100 amps if you want to protect it with a raceway. The detached building with subpanel needs one 8' ground rod, connected to the subpanel with #6 copper. Be sure to talk to a local electrician, but a lot of times you can drive a ground rod anywhere its needed. I'm not going to go and look, but I don't recall where it says that if I run two separate branch circuits, both with their own hot and neutral and a common ground I need to drive ground rods. Also note that a detached structure requires a grounding source (ground rod) whether it is a 3 or 4 wire remote panel. NEC Article 225.31 – A main breaker must be installed if there are more than six circuit breakers in the sub panel. A rod is required for separate buildings with subpanels, but not as a substitute ground fault path for the system. An MLO panel doesn't cut it (IIRC). You'll have 4 wires." ALL sub-panels in detached buildings require at least one, and sometimes two, grounding electrodes, aka ground rods. I was surprised and asked him about that. For a better experience, please enable JavaScript in your browser before proceeding. Impractical question: is it possible to find the regression line using a ruler and compass? Does the rod need to be 8' down in the ground . First order condition of log functions in general and interpretation. Does a grounding wire from a breaker panel to an outside grounding rod need to be in conduit? That's the easy way out and the most effective ground you can make in most places. Do I need a grounding rod at the garage or is the ground via the service cable to the garage enough? He said, "no, you don't need to because you are replacing the overhead existing triplex with quadplex 4 wire. 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