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Electrical Systems in Construction Flashcards

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

Read the first 7 Electrical Systems in Construction flashcards as text

  1. What is the purpose of a load center (electrical panel) in a building?

    Answer: To distribute electrical power to branch circuits and provide overcurrent protection

    A load center distributes incoming electrical service into individual branch circuits, each protected by a breaker or fuse to prevent overloads.

  2. When pulling wire through conduit, what material is commonly used to reduce friction?

    Answer: Wire pulling lubricant (wire pulling gel)

    Wire pulling lubricant (pulling gel) is specifically designed to reduce friction without damaging wire insulation and is the industry-standard choice.

  3. What is the minimum clearance required between the top of a residential electrical panel and the ceiling?

    Answer: 6.5 feet

    NEC 110.26 requires a minimum dedicated headroom of 6.5 feet (78 inches) above electrical equipment to ensure safe working space.

  4. What does the term 'ampacity' refer to in electrical construction?

    Answer: The maximum current a conductor can carry continuously without exceeding its temperature rating

    Ampacity is the maximum current in amperes a conductor can continuously carry under specific conditions without exceeding its insulation temperature rating.

  5. Which AWG wire size is commonly used for a 20-amp, 120-volt branch circuit?

    Answer: 12 AWG

    12 AWG copper wire has an ampacity of 20 amps and is the NEC-required minimum size for 20-amp branch circuits.

  6. What is a 'home run' in electrical construction terminology?

    Answer: The cable that runs from the last device on a circuit back to the panel

    A home run is the wire or cable that connects the last outlet or device on a circuit directly back to the main panel, completing the circuit path.

  7. Under OSHA 1926 Subpart K, what is the required assured equipment grounding conductor program (AEGCP) used as an alternative to?

    Answer: GFCI protection on construction sites

    OSHA 1926.404 allows an assured equipment grounding conductor program as an alternative to GFCI protection for temporary power on construction sites.