# Point of common coupling Canonical URL: https://eloragrid.ai/symbols/point-of-common-coupling Publisher: Elora Grid Updated: 2026-10-28 Lookup label: PCC Drawing use: SLD Reference families: IEC, IEEE / ANSI A marker on a single-line diagram identifying where a customer installation or microgrid meets the public network. ## In plain English ### What does Point of common coupling mean? The point of common coupling is the location on the network nearest to the installation where other customers are, or could be, connected. Harmonic, flicker and voltage limits in connection agreements are assessed at this point, and microgrid islanding decisions are often defined relative to it. ### A simple example Drawings mark the point with a dot, circle, flag or label PCC on the busbar or cable, often together with the ownership boundary and the revenue meter. A microgrid may show both a PCC with the utility and internal points of connection for each source. ### What the drawings help you do The marker carries no electrical function itself. It does not tell you the ownership boundary, which can differ from the PCC, or the fault level at that point, which must be stated for compliance assessments. ### This particular reference A marker on a single-line diagram identifying where a customer installation or microgrid meets the public network. A PCC marks an assessment point; a utility grid connection symbol represents the supply itself. ### Terms - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Terminal: An identified point where a conductor connects. - Rating: A value stating the conditions for which equipment is specified. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design) - [Reliable hybrid power and microgrid solutions](https://www.deif.com/applications/power-generation/reliable-hybrid-power-and-microgrid-solutions/) ## What it represents The point of common coupling is the location on the network nearest to the installation where other customers are, or could be, connected. Harmonic, flicker and voltage limits in connection agreements are assessed at this point, and microgrid islanding decisions are often defined relative to it. Drawings mark the point with a dot, circle, flag or label PCC on the busbar or cable, often together with the ownership boundary and the revenue meter. A microgrid may show both a PCC with the utility and internal points of connection for each source. The marker carries no electrical function itself. It does not tell you the ownership boundary, which can differ from the PCC, or the fault level at that point, which must be stated for compliance assessments. ## How to read it - Do not assume the PCC and the ownership boundary coincide. - Power quality limits are assessed here. ## Information to show or reference - State voltage level and fault level at the PCC. - Show the ownership boundary separately. - Reference connection agreement limits. ## Important distinction A PCC marks an assessment point; a utility grid connection symbol represents the supply itself. ## Facts - Electrical function: None, a reference marker - Used for: Power quality and connection limits - Preview: Independent educational illustration; exact standard graphic not certified ## Public references - [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design) — Schneider Electric — Electrical Installation Guide. Public electrical installation design references covering supply connection. - [Reliable hybrid power and microgrid solutions](https://www.deif.com/applications/power-generation/reliable-hybrid-power-and-microgrid-solutions/) — DEIF. Public microgrid context with mains import and export at the connection point. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.