The controls system within the building then operates the sources or distributed energy resources, to either modulate the flow of energy based on the utility agreement or to create a stand-alone system or “island.” So what does that mean to a commercial building? That means that some or in most cases, all of the power production equipment on a facility’s site is interconnected within the site distribution on the customer’s side of the point of common coupling. A microgrid can connect and disconnect from the grid to enable it to operate in both grid-connected or island-mode.” The Department of Energy Microgrid Exchange Group defines a microgrid as “ a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid. But first, to understand where to start within the NEC, we need to clearly define what the parts of a microgrid are and how a microgrid connects to the building. In this case, we will focus on NFPA 70: National Electrical Code (2020 edition), as that will be applicable to most designs, with few exceptions for utility-scale generation sources. In general, the local building codes and ordinances will govern the design and installation of commercial and industrial facilities, however which code applies depends on the location, type and size of the facility or installation.
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