Practice Test Geeks(CEP) Certified Electrical Professional Practice Test
← All CEP Flashcard Decks

Installation & Maintenance Practices Flashcards

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

Read the first 7 Installation & Maintenance Practices flashcards as text

  1. What is the maximum voltage drop recommended by NEC 210.19(A) Informational Note for branch circuits to minimize energy waste?

    Answer: 3% for branch circuits

    NEC 210.19(A) Informational Note No. 4 recommends a maximum 3% voltage drop for branch circuits, with 5% total for feeders and branch circuits combined.

  2. When installing liquidtight flexible metal conduit (LFMC) in a wet location, what additional fitting requirement applies?

    Answer: Only listed liquidtight fittings rated for wet locations are permitted

    NEC 350.42 requires listed fittings specifically designed for use with LFMC, and when used in wet locations, those fittings must be listed for wet locations.

  3. A maintenance worker discovers that the equipment grounding conductor (EGC) in a 20A, 120V circuit has been disconnected at the receptacle. What is the immediate hazard?

    Answer: Fault current may energize metal enclosures, creating a shock hazard

    Without the EGC, a fault in the equipment will energize the metal casing, creating a lethal shock hazard since there is no low-impedance return path to trip the breaker.

  4. What does NEC Article 410 require regarding the clearance between a recessed luminaire and thermal insulation?

    Answer: At least 3 inches of clearance unless the luminaire is IC-rated

    NEC 410.116(B) requires at least 3 inches of clearance between recessed luminaires and thermal insulation unless the luminaire is listed and marked as suitable for direct contact with insulation (IC-rated).

  5. When testing a newly installed grounding electrode system, what is the maximum acceptable ground resistance for a single electrode per NEC 250.56?

    Answer: 25 ohms

    NEC 250.56 states that if a single ground rod, pipe, or plate electrode has a resistance to ground exceeding 25 ohms, a supplemental electrode must be added.

  6. What is the purpose of applying anti-oxidant compound when terminating aluminum conductors on lugs?

    Answer: To prevent the oxide layer from increasing resistance at the connection

    Aluminum rapidly forms a high-resistance oxide layer when exposed to air; anti-oxidant compound penetrates and prevents oxidation, maintaining low contact resistance at the termination.

  7. Per NEC 300.5, what is the minimum burial depth for a 120/240V residential service lateral using direct-buried cable (USE-2 or URD)?

    Answer: 24 inches

    NEC Table 300.5 requires a minimum burial depth of 24 inches for direct-buried service lateral conductors at 0–600V residential circuits.