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Electrical Systems & Wiring Flashcards

7 cards from real CTE 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 & Wiring flashcards as text

  1. Which OSHA standard specifically governs electrical safety-related work practices for general industry workers, including CTE lab instructors?

    Answer: OSHA 29 CFR 1910 Subpart S

    OSHA 29 CFR 1910 Subpart S covers electrical safety-related work practices for general industry, which includes educational facilities.

  2. When demonstrating lockout/tagout (LOTO) procedures to CTE students, what is the FIRST step in the sequence?

    Answer: Identify all energy sources

    The LOTO procedure begins with identifying all energy sources (electrical, pneumatic, hydraulic, etc.) before any isolation or lockout occurs.

  3. A student is wiring a 20A, 120V circuit for workshop tools. What is the maximum load in watts that should be placed on this circuit per NEC continuous load rules?

    Answer: 1920W

    NEC requires continuous loads not exceed 80% of circuit capacity; 20A × 120V = 2400W × 80% = 1920W maximum.

  4. What is the principal advantage of using EMT (Electrical Metallic Tubing) over PVC conduit in a CTE lab environment?

    Answer: EMT can serve as the equipment grounding conductor

    Steel EMT can serve as the equipment grounding conductor (EGC) when properly connected, eliminating the need for a separate green wire in metallic conduit systems.

  5. In teaching residential load calculations, a student must calculate the general lighting load for a 2,000 sq ft house. Using NEC Table 220.12, what is the minimum volt-amperes assigned?

    Answer: 6,000 VA

    NEC Table 220.12 assigns 3 VA per square foot for dwelling units; 2,000 sq ft × 3 VA = 6,000 VA.

  6. Which grounding electrode is given FIRST priority in the NEC's grounding electrode system hierarchy for a new residential installation?

    Answer: Metal underground water pipe

    NEC 250.52(A)(1) gives first priority to a metal underground water pipe in contact with earth for 10 feet or more as a grounding electrode.

  7. A CTE electrical student calculates the voltage drop on a 100-foot, 12 AWG copper circuit supplying 16A at 120V. Using the VD formula, is this within NEC recommended limits?

    Answer: No, voltage drop exceeds 3%

    VD = (2 × K × I × D) / CM = (2 × 12.9 × 16 × 100) / 6,530 ≈ 6.3V = 5.3%, exceeding the NEC-recommended 3% for branch circuits.