NABCEP PV Installation Professional
Exam
NABCEP
North American Board of Certified Energy Practioners
JTA
Job Task Analysis
The JTA outlines the expected duties of a qualified PV installation expert.
Conduit Fill
(i.E. Maximum Percent of Conduit Area Available for Conductors)
NEC Chapter 9 Table 1
Voltage Drop Limits
ASHRAE 90.1 Standards shows no more than three% of nominal voltage.
NEC shows no more than five% in an "Informational Note".
Sunpower trendy is no greater than 1%.
Voltage Drop Equation
% drop =(zero.2 x D x I x R )/V
Where:
D= one-way distance (in ft)
I = contemporary (nominal actual value, no one hundred twenty five% elements, use Imp for
solar circuits)
R = resistance of conductors (in ohms/1000ft)
V = voltage (regular, nominal, use Vmp for solar circuits)
Resistance values may be observed in NEC Chapter 9 Table eight "Conductor Properties"
What size FMC conduit must be used for 4 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
question.
,1-1/4"
Use Chapter nine Tables 4 and 5.
BIPV
Building-Integrated Photovoltaics
Can unmarried section inverters be related to a few-phase power structures?
Yes, as long as vast unbalanced voltages can't end result
705.100
What is the minimal busbar score for a subpanel used as an inverter ac combiner panel to
combine 3 4000W, 240V unmarried phase inverters?
125A
Rating of each breaker = sixteen.7 X 1.25 = 25A
Sum of inverter breakers = three x 25A = 75A
Minimum size of returned-fed breaker in main carrier panel = 3 x 16.7A x 1.25 = 62.2 --> 70A
Minimum size busbars in subpanel x 1.2 = inverter breakers + application breaker = 75A + 70A
Minimum length busbars in subpanel = (75A + 70A)/1.2 = 121 --> 125A
705.12(D)(2)
Can an inverter output be related to a subpanel instead of the main distribution panel?
Yes, see 705.12(D).
But be careful that each panel in series meets the minimum busbar size requirements.
Grounded conductor
A present day sporting conductor this is intentionally bonded to floor. It is the neutral conductor
in any AC system.
Equipment grounding conductor (EGC)
The green or bare copper conductor linking exposed non-modern-sporting steel elements of
module frames, gadget and enclosures
, Grounding electrode conductor (GEC)
The bare copper conductor connecting the gadget grounding bus to a ground rod or to the
earth.
Grounding electrode
The rod or different buried electrode in the earth.
Grounding electrode gadget
Several grounding electrodes efficiently bonded together.
Sizing EGC
The EGC have to by no means be smaller than 14 AWG. Size the EGC in step with Table
250.122
BOS
Balance-of-System Components encompass all mechanical or electric additives and hardware
used to collect and intergrate most important components in a PV system together (i.E. All
additives in a PV system besides modules and inverters)
Stand-by myself PV systems
PV structures that function independently of different electric systems.
Interactive PV structures
PV structures that function in parallel with the electric utility grid.
Solar azimuth
The course of the solar's horizontal projection relative to some extent on the planet.
Solar altitude
The solar's elevation above the horizon.
Sun direction
A graphical representation of the sun's altitude and azimuth angles over a given day of the year.
Exam
NABCEP
North American Board of Certified Energy Practioners
JTA
Job Task Analysis
The JTA outlines the expected duties of a qualified PV installation expert.
Conduit Fill
(i.E. Maximum Percent of Conduit Area Available for Conductors)
NEC Chapter 9 Table 1
Voltage Drop Limits
ASHRAE 90.1 Standards shows no more than three% of nominal voltage.
NEC shows no more than five% in an "Informational Note".
Sunpower trendy is no greater than 1%.
Voltage Drop Equation
% drop =(zero.2 x D x I x R )/V
Where:
D= one-way distance (in ft)
I = contemporary (nominal actual value, no one hundred twenty five% elements, use Imp for
solar circuits)
R = resistance of conductors (in ohms/1000ft)
V = voltage (regular, nominal, use Vmp for solar circuits)
Resistance values may be observed in NEC Chapter 9 Table eight "Conductor Properties"
What size FMC conduit must be used for 4 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
question.
,1-1/4"
Use Chapter nine Tables 4 and 5.
BIPV
Building-Integrated Photovoltaics
Can unmarried section inverters be related to a few-phase power structures?
Yes, as long as vast unbalanced voltages can't end result
705.100
What is the minimal busbar score for a subpanel used as an inverter ac combiner panel to
combine 3 4000W, 240V unmarried phase inverters?
125A
Rating of each breaker = sixteen.7 X 1.25 = 25A
Sum of inverter breakers = three x 25A = 75A
Minimum size of returned-fed breaker in main carrier panel = 3 x 16.7A x 1.25 = 62.2 --> 70A
Minimum size busbars in subpanel x 1.2 = inverter breakers + application breaker = 75A + 70A
Minimum length busbars in subpanel = (75A + 70A)/1.2 = 121 --> 125A
705.12(D)(2)
Can an inverter output be related to a subpanel instead of the main distribution panel?
Yes, see 705.12(D).
But be careful that each panel in series meets the minimum busbar size requirements.
Grounded conductor
A present day sporting conductor this is intentionally bonded to floor. It is the neutral conductor
in any AC system.
Equipment grounding conductor (EGC)
The green or bare copper conductor linking exposed non-modern-sporting steel elements of
module frames, gadget and enclosures
, Grounding electrode conductor (GEC)
The bare copper conductor connecting the gadget grounding bus to a ground rod or to the
earth.
Grounding electrode
The rod or different buried electrode in the earth.
Grounding electrode gadget
Several grounding electrodes efficiently bonded together.
Sizing EGC
The EGC have to by no means be smaller than 14 AWG. Size the EGC in step with Table
250.122
BOS
Balance-of-System Components encompass all mechanical or electric additives and hardware
used to collect and intergrate most important components in a PV system together (i.E. All
additives in a PV system besides modules and inverters)
Stand-by myself PV systems
PV structures that function independently of different electric systems.
Interactive PV structures
PV structures that function in parallel with the electric utility grid.
Solar azimuth
The course of the solar's horizontal projection relative to some extent on the planet.
Solar altitude
The solar's elevation above the horizon.
Sun direction
A graphical representation of the sun's altitude and azimuth angles over a given day of the year.
