Practice Test Geeks(CEI) Certified Electrical Inspector Practice Test
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CEI Motor & Motor Control Inspection Flashcards

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

Read the first 6 CEI Motor & Motor Control Inspection flashcards as text

  1. According to NEC 430.53, multiple motors may be connected to a single branch circuit provided each motor has individual overload protection and the circuit is protected by a device rated at no more than:

    Answer: 125% of the largest motor's full-load current plus the sum of all others

    NEC 430.53(C) permits multiple motors on one branch circuit if the branch-circuit protection does not exceed 125% of the largest motor's FLA plus the FLA of all other motors.

  2. What is the minimum size of an equipment grounding conductor for a motor installation with a 60A branch-circuit protective device?

    Answer: 10 AWG copper

    Per NEC Table 250.122, a 60A overcurrent device requires a minimum 10 AWG copper equipment grounding conductor.

  3. During inspection, a motor nameplate indicates 'SF 1.15.' What does this service factor mean?

    Answer: The motor is rated for continuous duty at 115% of its nameplate horsepower

    A service factor of 1.15 means the motor can operate continuously at 115% of its nameplate horsepower under normal ambient conditions without exceeding design temperature rise.

  4. When inspecting motor wiring in a wet location, what wiring method is NOT acceptable?

    Answer: Nonmetallic-sheathed cable (NM-B)

    NM-B cable (Type NM) is not listed for use in wet or damp locations; only wiring methods suitable for wet locations are permitted per NEC 300.9.

  5. What is the NEC requirement for motor controller enclosures installed in outdoor locations?

    Answer: NEMA Type 3R or better (weatherproof) is required

    NEC 430.91 and Table 110.28 require enclosures suitable for the location; outdoor motor controllers must be weatherproof, minimum NEMA Type 3R.

  6. An inspector observes a 3-phase motor with only two overload relays installed (one per phase). Is this compliant with NEC Article 430?

    Answer: No, three overload relays are required for all 3-phase motors

    NEC 430.37 requires one overload unit in each phase for 3-phase motors unless certain listed devices provide equivalent protection; generally three overload relays are required.