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NABCEP PV Installation Professional Exam Questions And 100% Correct Answers
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NABCEP PV Installation Professional Exam QuestionsAnd 100% Correct Answers
NABCEP
North American Board of Certified Energy Practioners
JTA
Job Task Analysis
The JTA details what is expected of a qualified PV installation professional.
Conduit Fill
(i.e. Maximum Percent of Conduit Area Available for Conductors)
NEC Chapter 9 Table 1
Voltage Drop Limits
ASHRAE 90.1 Standards suggests no more than 3% of nominal voltage.
NEC suggests no more than 5% in an "Informational Note".
Sunpower standard is no more than 1%.
Voltage Drop Equation
% 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 Vmp for solar circuits)
Resistance values are provided in the NEC Chapter 9 Table 8 "Conductor Properties"
What size FMC conduit would be needed for four size 6 AWG XHHW conductors, one
size 8 AWG XHHW EGC and four 10 AWG THHN conductors? Use only the NEC code
book to answer this question.
1-1/4"
Chapter 9 Tables 4 and 5.
BIPV
Building-Integrated Photovoltaics
Can single phase inverters be connected to 3-phase power systems?
Yes, provided significant unbalanced voltages cannot result
705.100
What is the minimum busbar rating for a subpanel used as an inverter ac combiner
panel to combine three 4000W, 240V single phase inverters?
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 busbars in subpanel x 1.2 = inverter breakers + utility breaker = 75A + 70A
Minimum size busbars in subpanel = (75A + 70A)/1.2 = 121 --> 125A
705.12(D)(2)
Is it acceptable to connect an inverter output to a subpanel instead of the main
distribution panel?
Yes - see 705.12(D).
However, be aware that each panel in series needs to meet the minimum busbar size
requirements.
Grounded conductor
A current carrying conductor that is intentionally bonded to ground. It is the neutral
conductor in any AC system.
Equipment grounding conductor (EGC)
The green or bare copper conductor linking exposed non-current-carrying metal parts
of module frames, equipment and enclosures
Grounding electrode conductor (GEC)
The bare copper conductor connecting the system grounding bus to a ground rod or to
the earth.
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