Practice Test Geeks(NETA) InterNational Electrical Testing Association Certified Technicians Practice Test
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Switchgear and Busway Inspection Flashcards

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  1. In NETA terminology, what does the term 'metal-enclosed switchgear' distinguish from 'metal-clad switchgear'?

    Answer: Metal-clad has grounded metal barriers between compartments while metal-enclosed does not

    Metal-clad switchgear requires grounded metal barriers between all primary circuit compartments; metal-enclosed switchgear does not have this requirement.

  2. During busway inspection, which test method is best suited to locate a section with degraded phase-to-ground insulation without de-energizing the entire run?

    Answer: Ultrasonic partial discharge detection

    Ultrasonic partial discharge detection can locate degraded insulation on energized busway by detecting the acoustic signature of partial discharge activity.

  3. What ANSI/IEEE standard governs the testing of metal-clad switchgear and is referenced in NETA acceptance testing specifications?

    Answer: ANSI/IEEE C37.20.2

    ANSI/IEEE C37.20.2 is the standard for metal-clad switchgear and is the primary reference for acceptance testing requirements cited by NETA.

  4. A switchgear cubicle's primary disconnect stabs show pitting and arcing marks. What does this most likely indicate?

    Answer: The breaker was racked under load (closed position)

    Pitting and arcing marks on disconnect stabs indicate the breaker was inserted or withdrawn while closed (energized), which is prohibited.

  5. When measuring insulation resistance of switchgear bus with a megohmmeter, what minimum test voltage is typically specified by NETA for equipment rated 1 kV to 5 kV?

    Answer: 2500 V DC

    NETA specifies 2500 V DC for megohmmeter testing of insulation on equipment rated 1 kV to 5 kV.

  6. What is the primary purpose of the interlocking mechanism on draw-out switchgear?

    Answer: To prevent the breaker from being racked to the connected position unless it is in the open (tripped) state

    The primary interlock prevents the circuit breaker from being moved to or from the connected position while it is in the closed (ON) state, preventing arcing on the stabs.

  7. During a feeder busway inspection, you discover that a section's housing has a significant dent that partially deforms the enclosure inward. What is the primary concern?

    Answer: Reduced clearance between the enclosure and energized conductors creating an arc flash risk

    A deformed enclosure can reduce the air clearance between the housing and energized bus bars, creating a risk of flashover or arc flash to ground.