{
  "schemaVersion": "1.0",
  "id": "https://elect-learn.org/en/guides/outlet-symbol/",
  "url": "https://elect-learn.org/en/guides/outlet-symbol/",
  "markdownUrl": "https://elect-learn.org/en/guides/outlet-symbol/index.md",
  "jsonUrl": "https://elect-learn.org/en/guides/outlet-symbol/index.json",
  "language": "en",
  "title": "Outlet Symbol (Electrical Receptacle)",
  "description": "Learn how to read the electrical outlet symbol (receptacle) on floor plans and wiring diagrams, including duplex lines, ground markers, and common look-alikes.",
  "kind": "reference-guide",
  "safetyNotice": "Learning reference only: electrical codes, permits, inspection bodies, and licensing rules differ by region. This course is not a substitute for local code, licensed training, permits, or authority requirements. Before any hands-on work, de-energize, verify absence of voltage, and follow local regulators/AHJ and employer procedures.",
  "sections": [
    {
      "id": "direct-answer",
      "heading": "What does this symbol mean?",
      "paragraphs": [
        "On electrical floor plans and architectural layouts, this graphic is called an outlet symbol, receptacle symbol, or socket-outlet symbol. In North American construction notes, \"receptacle\" refers specifically to the contact device installed at the outlet box, while in IEC documentation it is most often listed as a \"socket-outlet.\"",
        "The outlet symbol marks the physical location and connection style of a power receptacle where corded equipment can plug into a branch circuit."
      ]
    },
    {
      "id": "symbol-figure",
      "heading": "See the symbol",
      "figure": {
        "src": "https://elect-learn.org/images/reference/outlet.svg",
        "alt": "Teaching drawing of a common duplex receptacle outlet symbol: a circle crossed by two parallel horizontal lines.",
        "caption": "A common US plan convention for a duplex convenience receptacle. The project legend controls the actual meaning.",
        "width": 160,
        "height": 100
      }
    },
    {
      "id": "read-the-drawing",
      "heading": "How to read it in context",
      "items": [
        "Locate the wall orientation: Find the flat side or extending legs of the symbol; the lines typically touch or point toward the wall, column, or floor surface where the box is mounted.",
        "Count the parallel lines: On North American plans, a circle with one line usually indicates a single (simplex) receptacle, two parallel lines indicate a standard duplex receptacle, and three lines or a triangle inside the circle often indicate a special-purpose receptacle as defined by the sheet legend.",
        "Check for shading or half-shading: Look inside the circle. A half-shaded circle commonly indicates a split-wired receptacle (where one half is controlled by a wall switch).",
        "Read adjacent letter tags: Check for text callouts right next to the circle (such as WP for weatherproof, GFI/GFCI, or mounting height notes) and cross-reference every abbreviation with the project symbol schedule.",
        "Trace the circuit homerun or switch leg: Follow any dashed or solid arc connecting the outlet symbol to a wall switch or panelboard homerun arrow to understand how it is energized."
      ],
      "ordered": true
    },
    {
      "id": "common-confusions",
      "heading": "Common look-alikes and mistakes",
      "items": [
        "Protected Receptacles (gfci-symbol): A standard outlet symbol and a ground-fault protected outlet look identical in base geometry; the difference is usually a text tag (such as GFI or GFCI) or a specific shading pattern noted in the legend.",
        "Wall Switches (switch-symbol): Beginners scanning a crowded architectural floor plan sometimes confuse wall switch markers (S) with wall outlets; switches use an S geometry or an open circle with an angled flag rather than parallel prongs touching the wall.",
        "Lighting Fixtures (lamp-symbol): Ceiling or wall luminaires also use circles on architectural plans, but wall lamps normally include internal crosshairs or radiation ticks rather than parallel receptacle lines.",
        "Protective Earth Connections (ground-symbol): In IEC schematics, a socket-outlet may include a small T-shaped protective earth marker inside the semicircle; do not confuse that internal grounding mark with a standalone chassis or earth ground symbol."
      ]
    },
    {
      "id": "faq-1",
      "heading": "Frequently asked question 1",
      "question": "Why do some outlet symbols use a full circle while others use an open semicircle?",
      "answer": "Full circles with parallel lines extending to the wall are standard in North American architectural floor plans. Open semicircles (resembling a cup facing the wall or plug contact) are standard in IEC 60617 architectural and installation diagrams."
    },
    {
      "id": "faq-2",
      "heading": "Frequently asked question 2",
      "question": "Does the outlet symbol tell me the voltage or current rating of the circuit?",
      "answer": "No. The graphic symbol only identifies the presence and general configuration of the receptacle. Circuit ratings, wire sizes, and breaker details must be read from the panel schedule, circuit numbers, or explicit engineering notes on the drawing."
    },
    {
      "id": "faq-3",
      "heading": "Frequently asked question 3",
      "question": "What does an outlet symbol inside a square box mean on a floor plan?",
      "answer": "A circle with parallel lines enclosed inside a square usually indicates a floor-mounted receptacle box rather than a wall-mounted outlet. Always verify this in the drawing legend."
    },
    {
      "id": "faq-4",
      "heading": "Frequently asked question 4",
      "question": "If I arrived here looking for a broad symbol chart, where can I compare drawing types?",
      "answer": "Readers arriving from older overview pages will land on the drawing-type overview at electrical-drawing-symbols, which separates architectural plan marks from schematic circuit diagrams."
    },
    {
      "id": "sources-and-next",
      "heading": "Standards, sources and related symbols",
      "paragraphs": [
        "Architectural receptacle symbols vary significantly between regional drafting conventions (such as US government plan conventions versus IEC 60617 installation symbols) and individual engineering firms. Never assume a specialty mark, shading pattern, or letter suffix has a universal meaning—always verify against the specific symbol legend and schedules included in your project drawing set.",
        "These are independently drawn teaching diagrams. They help you read a drawing, but the project legend, applicable standard and equipment documentation control the actual meaning. Editorial source check: 5 November 2026."
      ],
      "links": [
        {
          "title": "IEC 60617 — graphical symbols for diagrams",
          "url": "https://webstore.iec.ch/en/publication/2723"
        },
        {
          "title": "US Government Publishing Office — Standard Electrical Symbols",
          "url": "https://www.govinfo.gov/content/pkg/GOVPUB-D101-424880d1aab4de9f07cde11beb1841d6/pdf/GOVPUB-D101-424880d1aab4de9f07cde11beb1841d6.pdf"
        },
        {
          "title": "IEC 60617",
          "url": "https://webstore.iec.ch/en/publication/2723"
        },
        {
          "title": "DOE Fundamentals Handbook: Electrical Science",
          "url": "https://www.energy.gov/documents/doe-hdbk-1011-92vol1"
        },
        {
          "title": "US GPO — Standard Electrical Symbols",
          "url": "https://www.govinfo.gov/content/pkg/GOVPUB-D101-424880d1aab4de9f07cde11beb1841d6/pdf/GOVPUB-D101-424880d1aab4de9f07cde11beb1841d6.pdf"
        },
        {
          "title": "UFC — Electrical Engineering",
          "url": "https://www.wbdg.org/FFC/DOD/UFC/ufc_3_501_01_2024.pdf"
        },
        {
          "title": "Electrical Drawing Symbols: 4 Core Diagram Types",
          "url": "https://elect-learn.org/en/guides/electrical-drawing-symbols/"
        },
        {
          "title": "GFCI Symbol on Electrical Plans: Meaning & How to Read It",
          "url": "https://elect-learn.org/en/guides/gfci-symbol/"
        },
        {
          "title": "Switch Symbol in Electrical Schematics & Floor Plans",
          "url": "https://elect-learn.org/en/guides/switch-symbol/"
        },
        {
          "title": "Ground Symbol: Earth, Chassis & Signal Ground Explained",
          "url": "https://elect-learn.org/en/guides/ground-symbol/"
        },
        {
          "title": "Content responsibility and review status",
          "url": "https://elect-learn.org/en/methodology/"
        }
      ]
    }
  ],
  "dateModified": "2026-10-29",
  "datePublished": "2026-10-28",
  "publisher": {
    "name": "Elect Learn",
    "url": "https://elect-learn.org"
  },
  "review": {
    "status": "not-independently-reviewed",
    "statement": "No independent professional review is recorded. Cited sources do not imply review or endorsement by those organizations.",
    "policyUrl": "https://elect-learn.org/en/methodology/"
  }
}