Practice Test GeeksSE Engr. - Solar Energy Engineering Certification Practice Test
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Safety Standards Flashcards

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

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  1. Under NEC 690.12, controlled conductors located outside the array boundary must be reduced to what level after rapid shutdown initiation?

    Answer: 30 V within 30 seconds

    NEC 690.12(B)(1) limits conductors outside the array boundary to 30 V within 30 seconds of initiation.

  2. NEC 690.11 requires DC arc-fault circuit protection for PV system DC circuits operating at what voltage or greater?

    Answer: 80 V

    PV DC circuits operating at 80 V or greater require listed arc-fault protection per NEC 690.11.

  3. What is the maximum PV system DC voltage permitted on one- and two-family dwellings under NEC 690.7?

    Answer: 600 V

    NEC 690.7 limits PV system DC circuits on one- and two-family dwellings to 600 V.

  4. When sizing PV source circuit conductors, what combined multiplier is typically applied to module short-circuit current (Isc)?

    Answer: 156%

    NEC 690.8 applies 125% for irradiance and another 125% for continuous duty, giving 1.25 × 1.25 = 156%.

  5. A panel has a 200 A busbar and a 200 A main breaker, with the PV breaker at the opposite end. Using the NEC 705.12 120% rule, what is the largest allowed PV backfed breaker?

    Answer: 40 A

    120% of 200 A is 240 A, so 240 A − 200 A main leaves 40 A for the PV breaker.

  6. Per NEC 690.13, the PV system disconnecting means may consist of no more than how many switches or sets of circuit breakers?

    Answer: Six

    NEC 690.13 allows the PV system disconnect to consist of up to six switches or six sets of breakers.

  7. What are the required functions of DC ground-fault protection for a PV array under NEC 690.41(B)?

    Answer: Detect the fault, interrupt the faulted circuit, and indicate the fault

    PV ground-fault protection must detect ground faults, interrupt the fault current path, and provide an indication of the fault.