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NABCEP Questions And Answers With Verified Solutions With Verified Solutions Already Passed
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NABCEP Questions And Answers With Verified Solutions With Verified Solutions Already Passed
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NABCEP Questions And Answers With VerifiedSolutions With Verified Solutions Already Passed
Which NEC section shows the requirements for working spaces around live
electrical equipment? - ANSWER 110.26
What is the maximum latitude at which the sun can achieve a 90º altitude angle? -
ANSWER Approx. 23.45º north and south of the equator, but like magnetic
declination, the latitude of the Tropics varies over time.
If the open circuit voltage of a polycrystalline silicon PV module is 37.0V, the
module Vmp is 29.9V, the inverter max voltage is 600VDC and its MPPT voltage
range is 300 to 480VDC, and the minimum temperature is -24°C. What is the
maximum number of modules per source circuit according to the NEC? List the
NEC section where the answer is found - ANSWER Answer C:
37V x 1.20 = 44.4V 600V max ÷ 44.4V = 13.4 → 13 modules
A PV array of Suniva 300 Watt modules consists of 3 rows and 10 columns of
racked modules mounted in landscape and facing south at latitude 30°. The
modules are tilted at 20⁰. The mounting posts are installed 3 ft. deep. How long
must the posts be? Module dimensions are 77.6" x 38.7". - ANSWER Answer: C
Sin(angle) = opposite ÷ hypotenuse
Sin(20⁰) = Height ÷ 38.7" x 3 Height = sin(20⁰) x 116.1" Height = 0.342 x 116.1" =
39.7 " 39.7" + 36" = 75.7"
At 43⁰ North latitude on the winter solstice, the solar altitude angle at noon
is____. - ANSWER d. 23.55⁰ 90° - 43° (latitude) + (-23.45°) = 23.55° For the
Summer Solstice, the third number is +23.45°C, resulting in 70.45°. For either
equinox, the last number is zero.
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