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NABCEP PV Installation Professional Exam QUESTIONS AND ANSWERS GRADED A+ 2024/2025
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NABCEP PV Installation Professional Exam QUESTIONS AND ANSWERS GRADED A+ 2024/2025
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NABCEP PV Installation ProfessionalExam
NABCEP
North American Board of Certified Energy Practioners
JTA
Job Task Analysis
The JTA outlines the expected duties of a qualified PV set up professional.
Conduit Fill
(i.E. Maximum Percent of Conduit Area Available for Conductors)
NEC Chapter nine Table 1
Voltage Drop Limits
ASHRAE ninety.1 Standards suggests no more than three% of nominal voltage.
NEC suggests no more than 5% in an "Informational Note".
Sunpower wellknown is not any extra than 1%.
Voltage Drop Equation
% drop =(0.2 x D x I x R )/V
Where:
D= one-manner distance (in feet)
I = modern-day (nominal actual cost, no 125% factors, use Imp for solar circuits)
R = resistance of conductors (in ohms/1000ft)
V = voltage (normal, nominal, use Vmp for solar circuits)
Resistance values can be located in NEC Chapter nine Table eight "Conductor Properties"
What length FMC conduit should be used for four size 6 AWG XHHW conductors, one size
eight AWG XHHW EGC and four 10 AWG THHN conductors? Only use the NEC code e
book to reply this query.
1-1/4"
Use Chapter nine Tables four and 5.
,BIPV
Building-Integrated Photovoltaics
Can single section inverters be connected to 3-phase strength systems?
Yes, so long as large unbalanced voltages can't end result
705.A hundred
What is the minimal busbar rating for a subpanel used as an inverter ac combiner panel to
combine 3 4000W, 240V unmarried segment inverters?
125A
Rating of every breaker = 16.7 X 1.25 = 25A
Sum of inverter breakers = three x 25A = 75A
Minimum size of back-fed breaker in foremost service panel = 3 x 16.7A x 1.25 = sixty two.2
--> 70A
Minimum length busbars in subpanel x 1.2 = inverter breakers + application breaker = 75A +
70A
Minimum size busbars in subpanel = (75A + 70A)/1.2 = 121 --> 125A
705.12(D)(2)
Can an inverter output be related to a subpanel in preference to the primary distribution
panel?
Yes, see 705.12(D).
But be careful that each panel in series meets the minimum busbar length requirements.
Grounded conductor
A cutting-edge sporting conductor that is deliberately bonded to ground. It is the neutral
conductor in any AC machine.
Equipment grounding conductor (EGC)
The green or bare copper conductor linking uncovered non-modern-day-wearing steel parts
of module frames, gadget and enclosures
Grounding electrode conductor (GEC)
The naked copper conductor connecting the gadget grounding bus to a ground rod or to the
earth.
, Grounding electrode
The rod or different buried electrode within the earth.
Grounding electrode machine
Several grounding electrodes correctly bonded collectively.
Sizing EGC
The EGC ought to never be smaller than 14 AWG. Size the EGC in keeping with Table
250.122
BOS
Balance-of-System Components consist of all mechanical or electrical components and
hardware used to assemble and intergrate major additives in a PV device together (i.E. All
additives in a PV system besides modules and inverters)
Stand-by myself PV structures
PV systems that function independently of other electrical systems.
Interactive PV structures
PV structures that perform in parallel with the electrical application grid.
Solar azimuth
The path of the solar's horizontal projection relative to some extent on this planet.
Solar altitude
The solar's elevation above the horizon.
Sun course
A graphical illustration of the sun's altitude and azimuth angles over a given day of the 12
months.
Solar midday
The nearby time when the solar is at its maximum point in the sky and crossing the
neighborhood meridian (line of longitude).
Solar window
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