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Sean White NABCEP > Flash card material > Flashcards

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1
Q

Area of a circle

A

3.14 x radius ^2

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2
Q

Area of a cylinder

A

depth x 3.14 x radius ^2

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3
Q

Volume

A

Length x width x height

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4
Q

How many cm per inch

A

2.54cm

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5
Q

How many feet per meter

A

3.28

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6
Q

Wind category B

A

urban/suburban or wooded with close obstructions

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7
Q

Wind category C

A

Scattered obstructions

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8
Q

Wind category D

A

No obstructions and wide open

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9
Q

Wind category A

A

No longer in use

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10
Q

Roof zone 3

A

roof corners

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11
Q

Roof zone 2

A

roof edges

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12
Q

Roof zone 1

A

middle of roof (best for solar)

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13
Q

Another name for PV Source Circuit

A

string

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14
Q

Another name for Dc-to-dc converter

A

Optimizer

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15
Q

Fancy name for solar panel

A

PV Module

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16
Q

Where is a PV Source circuit located?

A

Between PV and Combiner box

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17
Q

Where is a PV Output circuit located?

A

After parallel connections in a combiner

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18
Q

PV maximum current

A

Isc x 1.25

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19
Q

PV required ampacity for continuous current

A

Isc x 1.56

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20
Q

Required ampacity for continuous current for other than PV source and output circuits

A

125% of current

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21
Q

When is 156% Ampacity correction used

A

Only for PV source and output circuits

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22
Q

When is 156% Ampacity correction not used

A

Conditions of use calculations

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23
Q

Do not

A

calculate continuous current and conditions of use in the same calculation

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24
Q

OCPD size formula

A

maximum current x 1.25 AND round UP

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25
What is required if disconnects are in different locations?
directory or plaque at each disconnect
26
When is string sizing rounded down?
Cold temperature high Voc calculations
27
When is string sizing rounded up?
Hot temperature low Vmp calculations
28
Rapid shutdown array boundary
1 foot outside / 3 feet inside
29
Pilot holes must be
67-80% of a lag bolt size
30
Fine stranded cable must be paired with
Fine-stranded rated lugs
31
When are different string orientations acceptable?
Only with dc to dc converters
32
Width of working space
width of equipment or 30" whichever is greater
33
When is "time of use" most expensive
Summer afternoons
34
When are "tiered" utility rates most expensive
The more you use
35
Sine waves are
less harmonic distortion
36
Conductors inside outdoor conduit must be
wet-rated
37
80% STC irradiance (W/m^2)
800 W/m^2
38
ASHRAE
Dataset for temperatures and wind speeds
39
Multimodal inverters
Can power critical loads when the grid shuts down
40
Ground fault protection is required on
PV on buildings
41
Insulation testing is done with a
Megohmmeter (megger)
42
What color(s) are grounded conductors in N. America?
White or gray
43
Ground rods are
Copper coated steel, 5/8" in diameter and 8' long
44
Do not use a aluminum GEC when
incased in concrete
45
Functional grounded inverters
include fuse grounded and transformerless inverters
46
Functional grounded inverters wire type
PV wire, or USE-2 on source circuits
47
Functional grounded inverter fusing
only requires fuses on one polarity if fused in combiner
48
Bypass diode failure usually decreases voltage by how much
1/3rd of a module
49
120/240 is called what
Split phase or single phase
50
120V inverters
have a single pole ac disconnect/breaker and are mostly seen in off grid systems
51
No multi-wire branch circuit signs required
with 120V inverter
52
No more than ____ switches to turn off PV systems on a building
Six
53
No disconnect on _______________ with exceptions for GFDI, AFCI and maintenance.
Grounded conductors
54
Which circuits must be separated from other circuits?
PV Source & Output circuits.
55
When is a load break rated manual disconnect located within 10 feet of a combiner?
If the current is greater than 30A
56
Can be a connector or a disconnect, must be within 10 feet of equipment
Isolating device
57
Interactive inverters don't need a clamped breaker
58
Bond rails to each other
59
UL 1741
UL Listing for Inverters
60
UL 1703
UL Listing for PV Modules
61
Maximum height for a DC Disconnect
6.5 feet
62
Add acid to water so acid doesn't splash
63
Solidly grounded conductors don't need
disconnect's or fuses
64
Dead load
Anything permanent (solar system, HVAC)
65
Designated safety person may not
be distracted
66
No DC Disconnect where
Bathroom (wet feet)
67
Do not bond a neutral into two places
68
If disconnects aren't near each other what is required?
plaque or directory
69
What battery chemistry requires cell equalization?
Lead acid
70
Battery working spaces require what
lights
71
What is the safest ladder?
Fiberglass with aluminum steps
72
USE-2
Underground Service Entrance cable Suitable for direct burial, UV resistant,
73
THWN-2
Thermoplastic High heat Water resistant Nylon coated. "2" at the end refers to a 90 degrees C temperature rating.
74
Temperature corrected MAXIMUM VoC Formula
VoC x (100% + ((delta T) x TkVoc))
75
Temperature corrected MINIMUM Formula
Vmp x (100% + ((Tadd+Tmax-Tstc) x TkPmp))
76
What is the "Tadd" variable in voltage calculations?
accounts for the increased temperatures of PV cells above ambient temps under operating conditions, Roof mount= 30 degrees Ground mount= 25 degrees Pole mount= 20 degrees ^^^adders above ambient temperature
77
RHW-2

Sean White NABCEP (3 decks)

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