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Sean White NABCEP > Flash card material > Flashcards

Flash card material

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NABCEP Entry Level flashcards
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
Q

What is required if disconnects are in different locations?

A

directory or plaque at each disconnect

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26
Q

When is string sizing rounded down?

A

Cold temperature high Voc calculations

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27
Q

When is string sizing rounded up?

A

Hot temperature low Vmp calculations

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28
Q

Rapid shutdown array boundary

A

1 foot outside / 3 feet inside

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29
Q

Pilot holes must be

A

67-80% of a lag bolt size

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30
Q

Fine stranded cable must be paired with

A

Fine-stranded rated lugs

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31
Q

When are different string orientations acceptable?

A

Only with dc to dc converters

32
Q

Width of working space

A

width of equipment or 30” whichever is greater

33
Q

When is “time of use” most expensive

A

Summer afternoons

34
Q

When are “tiered” utility rates most expensive

A

The more you use

35
Q

Sine waves are

A

less harmonic distortion

36
Q

Conductors inside outdoor conduit must be

A

wet-rated

37
Q

80% STC irradiance (W/m^2)

A

800 W/m^2

38
Q

ASHRAE

A

Dataset for temperatures and wind speeds

39
Q

Multimodal inverters

A

Can power critical loads when the grid shuts down

40
Q

Ground fault protection is required on

A

PV on buildings

41
Q

Insulation testing is done with a

A

Megohmmeter (megger)

42
Q

What color(s) are grounded conductors in N. America?

A

White or gray

43
Q

Ground rods are

A

Copper coated steel, 5/8” in diameter and 8’ long

44
Q

Do not use a aluminum GEC when

A

incased in concrete

45
Q

Functional grounded inverters

A

include fuse grounded and transformerless inverters

46
Q

Functional grounded inverters wire type

A

PV wire, or USE-2 on source circuits

47
Q

Functional grounded inverter fusing

A

only requires fuses on one polarity if fused in combiner

48
Q

Bypass diode failure usually decreases voltage by how much

A

1/3rd of a module

49
Q

120/240 is called what

A

Split phase or single phase

50
Q

120V inverters

A

have a single pole ac disconnect/breaker and are mostly seen in off grid systems

51
Q

No multi-wire branch circuit signs required

A

with 120V inverter

52
Q

No more than ____ switches to turn off PV systems on a building

A

Six

53
Q

No disconnect on _______________ with exceptions for GFDI, AFCI and maintenance.

A

Grounded conductors

54
Q

Which circuits must be separated from other circuits?

A

PV Source & Output circuits.

55
Q

When is a load break rated manual disconnect located within 10 feet of a combiner?

A

If the current is greater than 30A

56
Q

Can be a connector or a disconnect, must be within 10 feet of equipment

A

Isolating device

57
Q

Interactive inverters don’t need a clamped breaker

A
58
Q

Bond rails to each other

A
59
Q

UL 1741

A

UL Listing for Inverters

60
Q

UL 1703

A

UL Listing for PV Modules

61
Q

Maximum height for a DC Disconnect

A

6.5 feet

62
Q

Add acid to water so acid doesn’t splash

A
63
Q

Solidly grounded conductors don’t need

A

disconnect’s or fuses

64
Q

Dead load

A

Anything permanent (solar system, HVAC)

65
Q

Designated safety person may not

A

be distracted

66
Q

No DC Disconnect where

A

Bathroom (wet feet)

67
Q

Do not bond a neutral into two places

A
68
Q

If disconnects aren’t near each other what is required?

A

plaque or directory

69
Q

What battery chemistry requires cell equalization?

A

Lead acid

70
Q

Battery working spaces require what

A

lights

71
Q

What is the safest ladder?

A

Fiberglass with aluminum steps

72
Q

USE-2

A

Underground Service Entrance cable

Suitable for direct burial, UV resistant,

73
Q

THWN-2

A

Thermoplastic High heat Water resistant Nylon coated.

“2” at the end refers to a 90 degrees C temperature rating.

74
Q

Temperature corrected MAXIMUM VoC Formula

A

VoC x (100% + ((delta T) x TkVoc))

75
Q

Temperature corrected MINIMUM Formula

A

Vmp x (100% + ((Tadd+Tmax-Tstc) x TkPmp))

76
Q

What is the “Tadd” variable in voltage calculations?

A

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
Q

RHW-2

A

Sean White NABCEP (3 decks)

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