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Electrical Systems and Safety Flashcards

6 cards from real ICC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Electrical Systems and Safety flashcards as text

  1. What is the minimum wire gauge required for a 20-ampere branch circuit in a residential installation?

    Answer: 12 AWG

    12 AWG copper wire is the minimum size required for 20-ampere branch circuits to prevent overheating.

  2. In Illinois, electrical inspections for new residential construction are performed by:

    Answer: The local authority having jurisdiction (AHJ)

    The Authority Having Jurisdiction (AHJ), typically the local building department, performs mandatory electrical inspections.

  3. What is the maximum length of a flexible cord used as a substitute for permanent wiring under Illinois electrical code?

    Answer: Flexible cords may never substitute for permanent wiring

    The NEC, adopted in Illinois, prohibits the use of flexible cords as a substitute for permanent fixed wiring.

  4. Which of the following is a lockout/tagout (LOTO) requirement when performing electrical maintenance in Illinois?

    Answer: Isolate and de-energize all energy sources before beginning work

    Lockout/Tagout procedures require that all energy sources be isolated and locked out before any maintenance work begins.

  5. What is the required height for service entrance conductors over a public sidewalk in Illinois?

    Answer: 10 feet

    Service entrance conductors must maintain a minimum height of 10 feet over pedestrian areas such as public sidewalks.

  6. Which piece of personal protective equipment (PPE) is essential when working on or near energized electrical panels?

    Answer: Arc flash-rated face shield and flame-resistant clothing

    Arc flash-rated PPE including a face shield and flame-resistant clothing protect workers from the extreme heat and pressure of an arc flash event.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. ilga.gov — Test delivery, late registration, renewal, score validity, eligibility, fees · verified Oct 2026
  2. icc.illinois.gov — Eligibility, fees · verified Oct 2026