{
  "schemaVersion": "1.0",
  "id": "https://elect-learn.org/en/lesson/07-breakers-gfci-afci-panel/",
  "url": "https://elect-learn.org/en/lesson/07-breakers-gfci-afci-panel/",
  "markdownUrl": "https://elect-learn.org/en/lesson/07-breakers-gfci-afci-panel/index.md",
  "jsonUrl": "https://elect-learn.org/en/lesson/07-breakers-gfci-afci-panel/index.json",
  "language": "en",
  "title": "Breakers, GFCI, AFCI, and Panels",
  "description": "Recognize what common protective devices do and do not protect, and what trips tell you.",
  "kind": "lesson",
  "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": "section-1",
      "heading": "Lesson information",
      "paragraphs": [
        "Residential Devices · Intermediate · 24 min",
        "Protection",
        "Interactive"
      ]
    },
    {
      "id": "section-2",
      "heading": "Understand what is protected before interpreting a trip.",
      "paragraphs": [
        "Overcurrent protection responds to excessive current. Residual-current protection responds to an imbalance between outgoing and returning current."
      ],
      "items": [
        "MCB: protection against overcurrent, including overload and short circuit.",
        "RCD/GFCI: residual-current detection; device types vary by region.",
        "AFCI/AFDD: arc-fault protection, a different function."
      ]
    },
    {
      "id": "section-3",
      "heading": "Goals",
      "items": [
        "Distinguish overcurrent, ground-fault, and arc-fault protection.",
        "Understand why upsizing a breaker is not an acceptable fix.",
        "Know which panel areas require licensed personnel."
      ]
    },
    {
      "id": "section-4",
      "heading": "GFCI trips immediately after reset",
      "paragraphs": [
        "A bathroom GFCI trips immediately after pressing RESET; downstream receptacles are also dead.",
        "Wrong call: Assuming the GFCI is bad and replacing it with a standard receptacle.",
        "Stop point: Damp locations and repeated trips are not reasons to bypass protection.",
        "Reasoning path: Unplug loads, check moisture and downstream devices; verify LINE/LOAD, leakage, or equipment faults.",
        "Review: Exam focus: GFCI locations, function, test/reset, AFCI, and breaker ratings."
      ]
    },
    {
      "id": "section-5",
      "heading": "Core concepts",
      "items": [
        "Breakers respond to overloads and shorts to protect conductors.",
        "GFCI responds to hot-neutral current imbalance.",
        "AFCI watches for arc signatures that may start fires."
      ]
    },
    {
      "id": "tool-multimeter",
      "heading": "Digital Multimeter",
      "paragraphs": [
        "Measures voltage, continuity, and resistance so you verify instead of guess.",
        "Misuse and limits: Wrong jack or mode selection can damage the meter or create danger."
      ]
    },
    {
      "id": "tool-breaker",
      "heading": "Circuit Breaker",
      "paragraphs": [
        "Interrupts overloads or shorts to protect conductors.",
        "Misuse and limits: Do not hide trip problems by installing a larger breaker."
      ]
    },
    {
      "id": "tool-gfci",
      "heading": "GFCI Receptacle",
      "paragraphs": [
        "Detects current imbalance and trips quickly, common in damp locations.",
        "Misuse and limits: Reversing LINE/LOAD can break downstream protection or reset behavior."
      ]
    },
    {
      "id": "section-9",
      "heading": "Common Pitfalls",
      "items": [
        "Solving trips by installing a larger breaker.",
        "Treating GFCI trips as mere nuisance.",
        "Touching unfamiliar energized areas inside a panel."
      ]
    },
    {
      "id": "section-10",
      "heading": "Safe Workflow",
      "items": [
        "Record load and environment when the trip occurs.",
        "Remove plug-in loads first, then test/reset.",
        "Repeated trips, odor, or internal panel issues go to licensed personnel."
      ],
      "ordered": true
    },
    {
      "id": "quiz-1",
      "heading": "Can repeated breaker trips be fixed by upsizing the breaker?",
      "paragraphs": [
        "No. The breaker must match conductor and equipment ratings; find the cause of trips."
      ]
    },
    {
      "id": "quiz-2",
      "heading": "What does a GFCI primarily detect?",
      "paragraphs": [
        "A current imbalance between hot and neutral."
      ]
    },
    {
      "id": "section-13",
      "heading": "Look Back",
      "links": [
        {
          "title": "Review Lesson 1: breakers protect conductors, not all personal safety hazards.",
          "url": "https://elect-learn.org/en/lesson/01-why-electricity-is-dangerous/"
        },
        {
          "title": "Review Lesson 5: GFCI detects hot-neutral imbalance.",
          "url": "https://elect-learn.org/en/lesson/05-hot-neutral-ground/"
        }
      ]
    }
  ],
  "dateModified": "2026-10-23",
  "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/"
  }
}