NABCEP PV Installation Professional Exam Questions and Answers.
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Course
Energy
Institution
Energy
NABCEP PV Installation Professional Exam Questions and Answers.
NABCEP PV Installation Professional Exam Questions and Answers.
NABCEP PV Installation Professional Exam Questions and Answers.
NABCEP PV Installation Professional Exam
Questions and Answers.
NABCEP - ANS North American Board of Certified Energy Practioners
JTA - ANS Job Task Analysis
The JTA outlines the expected duties of a qualified PV installation professional.
Conduit Fill
(i.e. Maximum Percent of Conduit Area Available for Conductors) - ANS NEC Chapter 9
Table 1
Voltage Drop Limits - ANS ASHRAE 90.1 Standards suggests no more than 3% of
nominal voltage.
NEC suggests no more than 5% in an "Informational Note".
Sun power standard is no more than 1%.
Voltage Drop Equation - ANS % drop = (0.2 x D x I x R)/V
Where:
D= one-way distance (in feet)
I = current (nominal actual value, no 125% factors, use Imp for solar circuits)
R = resistance of conductors (in ohms/1000ft)
V = voltage (typical, nominal, use Vamp for solar circuits)
Resistance values can be found in NEC Chapter 9 Table 8 "Conductor Properties"
What size FMC conduit should be used for four size 6 AWG XHHW conductors, one
size 8 AWG XHHW EGC and four 10 AWG THHN conductors? Only use the NEC code
book to answer this question. - ANS 1-1/4"
Use Chapter 9 Tables 4 and 5.
BIPV - ANS Building-Integrated Photovoltaics
Can single phase inverters be connected to 3-phase power systems? - ANS Yes, as
long as significant unbalanced voltages cannot result
705.100
What is the minimum bulbar rating for a subpanel used as an inverter ac combiner
panel to combine three 4000W, 240V single phase inverters? - ANS 125A
Rating of each breaker = 16.7 X 1.25 = 25A
, Sum of inverter breakers = 3 x 25A = 75A
Minimum size of back-fed breaker in main service panel = 3 x 16.7A x 1.25 = 62.2 -->
70A
Minimum size bus bars in subpanel x 1.2 = inverter breakers + utility breaker = 75A +
70A
Minimum size bus bars in subpanel = (75A + 70A)/1.2 = 121 --> 125A
705.12(D)(2)
Can an inverter output be connected to a subpanel instead of the main distribution
panel? - ANS Yes, see 705.12(D).
But be careful that each panel in series meets the minimum bulbar size requirements.
Grounded conductor - ANS A current carrying conductor that is intentionally bonded to
ground. It is the neutral conductor in any AC system.
Equipment grounding conductor (EGC) - ANS The green or bare copper conductor
linking exposed non-current-carrying metal parts of module frames, equipment and
enclosures
Grounding electrode conductor (GEC) - ANS The bare copper conductor connecting the
system grounding bus to a ground rod or to the earth.
Grounding electrode - ANS The rod or other buried electrode in the earth.
Grounding electrode system - ANS Several grounding electrodes effectively bonded
together.
Sizing EGC - ANS The EGC should never be smaller than 14 AWG. Size the EGC
according to Table 250.122
BOS - ANS Balance-of-System Components include all mechanical or electrical
components and hardware used to assemble and integrate major components in a PV
system together (i.e. all components in a PV system except modules and inverters)
Stand-alone PV systems - ANS PV systems that operate independently of other
electrical systems.
Interactive PV systems - ANS PV systems that operate in parallel with the electric utility
grid.
Solar azimuth - ANS The direction of the sun's horizontal projection relative to a point on
earth.
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