{
  "schemaVersion": "1.0",
  "id": "https://elect-learn.org/en/lesson/11-single-pole-switch-troubleshooting/",
  "url": "https://elect-learn.org/en/lesson/11-single-pole-switch-troubleshooting/",
  "markdownUrl": "https://elect-learn.org/en/lesson/11-single-pole-switch-troubleshooting/index.md",
  "jsonUrl": "https://elect-learn.org/en/lesson/11-single-pole-switch-troubleshooting/index.json",
  "language": "en",
  "title": "Single-pole Switch Troubleshooting",
  "description": "Use dead lights, ineffective switches, and multi-wire boxes to practice circuit-based troubleshooting.",
  "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": [
        "Practical Workflows · Practical · 26 min",
        "Troubleshooting"
      ]
    },
    {
      "id": "section-2",
      "heading": "Follow circuit evidence instead of swapping parts.",
      "paragraphs": [
        "Decide what to measure before choosing a function and connection. Voltage and continuity answer different questions."
      ],
      "items": [
        "Distinguish the lamp, switch, connections, and upstream supply.",
        "Choose a measurement that tests the hypothesis; establish safe conditions first.",
        "Record where, under what conditions, and in which units a reading is abnormal."
      ]
    },
    {
      "id": "section-3",
      "heading": "Goals",
      "items": [
        "Identify feed, switch leg, load, and neutral.",
        "Distinguish bad switch, bad fixture, loose connection, and no supply.",
        "Use a meter and safe workflow to verify hypotheses."
      ]
    },
    {
      "id": "section-4",
      "heading": "Still dark after replacing the lamp",
      "paragraphs": [
        "A hallway light stays off after lamp replacement; the switch box has two black wires and a bundle of whites.",
        "Wrong call: Trying a white conductor on the switch to see what happens.",
        "Stop point: Unknown conductors must not be trial-connected; de-energize, label, and test first.",
        "Reasoning path: Confirm fixture and breaker, identify always-hot and switch leg; after de-energizing, test switch continuity and connections.",
        "Review: Exam focus: single-pole switches, switch legs, grounding, and neutral not passing through an ordinary switch."
      ]
    },
    {
      "id": "section-5",
      "heading": "Core concepts",
      "items": [
        "A basic single-pole switch simply opens or closes the hot path.",
        "A white bundle in a switch box is often neutral pass-through and should not be casually opened.",
        "Troubleshooting is hypothesize, verify, and narrow down, not trial wiring."
      ]
    },
    {
      "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-tester",
      "heading": "Non-contact Voltage Tester",
      "paragraphs": [
        "Quickly screens for possible voltage as an early warning.",
        "Misuse and limits: It is not proof of absence of voltage by itself; confirm with a suitable meter."
      ]
    },
    {
      "id": "tool-driver",
      "heading": "Insulated Screwdriver",
      "paragraphs": [
        "Used for terminals and cover screws; insulation adds a layer of protection.",
        "Misuse and limits: An insulated tool is not permission for live work and must not be trusted if damaged."
      ]
    },
    {
      "id": "tool-wire-nut",
      "heading": "Wire Connector",
      "paragraphs": [
        "Mechanically joins and insulates compatible conductors.",
        "Misuse and limits: Wrong size, uneven copper, or no pull test can leave a loose splice."
      ]
    },
    {
      "id": "tool-box",
      "heading": "Electrical Box",
      "paragraphs": [
        "Houses splices, supports devices, and protects connection points.",
        "Misuse and limits: Overfilled boxes, missing covers, or exposed splices are common hazards."
      ]
    },
    {
      "id": "section-11",
      "heading": "Common Pitfalls",
      "items": [
        "Replacing measurement with trial connections.",
        "Forgetting the fixture box may contain the feed.",
        "Not checking for other circuits in the same box after de-energizing one."
      ]
    },
    {
      "id": "section-12",
      "heading": "Safe Workflow",
      "items": [
        "Record the symptom: dark, flickering, ineffective switch, or trip.",
        "De-energize, verify, photograph, and label box conductors.",
        "Use continuity to check switch open/closed state; use voltage to confirm supply path.",
        "Stop and get help for multi-way, three-way, or unknown circuits."
      ],
      "ordered": true
    },
    {
      "id": "quiz-1",
      "heading": "Which conductor should a basic single-pole switch generally interrupt?",
      "paragraphs": [
        "The hot/ungrounded conductor, not the neutral."
      ]
    },
    {
      "id": "quiz-2",
      "heading": "Can an unknown conductor be briefly trial-connected?",
      "paragraphs": [
        "No. Label, measure, and confirm by diagram and code-compliant logic."
      ]
    },
    {
      "id": "section-15",
      "heading": "Look Back",
      "links": [
        {
          "title": "Review Lesson 3: continuity only on de-energized circuits.",
          "url": "https://elect-learn.org/en/lesson/03-multimeter-basics/"
        },
        {
          "title": "Review Lesson 8: switches usually control hot.",
          "url": "https://elect-learn.org/en/lesson/08-receptacles-switches-lights/"
        }
      ]
    }
  ],
  "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/"
  }
}