NABCEP Code Requirements 2

Question 1

Under NEC Article 690, what is the maximum voltage permitted for PV source circuits in one- and two-family dwellings?

Accepted Answer

1000V

Answer

NEC 690.7 limits PV source and output circuit voltages to 1000V for one- and two-family dwellings.

Question 2

According to NEC 690.12, rapid shutdown of PV systems on buildings requires that PV system conductors outside the array boundary be de-energized to no more than how many volts within 30 seconds of rapid shutdown initiation?

Accepted Answer

30V

Answer

NEC 690.12 requires conductors outside the array boundary to be reduced to 30V or less within 30 seconds.

Question 3

Which NEC article specifically governs energy storage systems (ESS) such as battery systems used with solar PV?

Accepted Answer

Article 706

Answer

NEC Article 706 covers energy storage systems, including battery systems paired with solar PV.

Question 4

When sizing PV source circuit conductors, NEC 690.8 requires the conductor ampacity to be at least what percentage of the sum of the short-circuit currents of all parallel-connected PV modules?

Accepted Answer

156.25%

Answer

NEC 690.8(A)(1) requires conductors to carry 125% of Isc, and then the overcurrent device and conductor must be sized at 125% of that value, yielding 156.25% of Isc.

Question 5

Per NEC 690.31, PV wiring systems installed in raceways exposed to direct sunlight on rooftops must use conductors with a temperature rating of at least:

Accepted Answer

90°C

Answer

NEC 690.31(A) requires conductors in raceways exposed to sunlight on rooftops to be rated at least 90°C.

(NABCEP) North American Board of Certified Energy Practitioners Solar Practice Test

(NABCEP) North American Board of Certified Energy Practitioners Solar Practice Test

NABCEP Code Requirements 2