Deck 22: Commercial Utility-Interactive Photovoltaic Systems

Question 1

Using the ____ and module frame grounding location specified in the module installation instructions is the only way to ensure connection integrity for the life of the system.

A)ground-fault current
B)aluminum frames
C)combiner boxes
D)grounding hardware

Answer 1

D

Question 2

How can the photovoltaic effect can be put to practical use in a commercial building?

Answer 2

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The photovoltaic effect can be put to practical use by supplying a commercial building with some or all of the electrical power it needs to operate. System sizes range from 2 kW to 1 mW and larger. The photovoltaic modules in the array produce direct current electricity when exposed to sunlight. Direct current from the modules supplies an inverter that converts the dc into alternating current (ac)synchronized with utility electricity.
The electrical energy produced by a photovoltaic system can be stored through the use of batteries that then supply the buildings electrical needs at night or on overcast days. A large enough system like this would not even need a utility supply of electricity.
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Question 3

NEC 705.10 requires that a(n)____ that indicates all interconnected power sources for the premises be installed at the service and the location(s)of the power production source(s).

A)removable label
B)sticker
C)instruction sheet
D)permanent plaque or directory

Answer 3

D

Question 4

The general procedure for inverter startup is to check ____ and current levels from the source (modules)to inverter closing disconnects and compare with expected values.

A)ampacity
B)wattage
C)voltage
D)conduction potential

Question 5

A ____-line diagram is an electrical schematic diagram for the utility interactive PV system.

A)single
B)double
C)split
D)reduced

Question 6

The equipment that converts the direct current produced by modules into an alternating current (ac)output is known as a(n)____.

A)reverter
B)converter
C)inverter
D)diverter

Question 7

A ground-mounted photovoltaic module array for a commercial building may be constructed so that it can be used as ____.

A)a chemical storage area
B)a raised walkway
C)covered vehicle parking
D)a break area for building occupants

Question 8

Ampacity correction for ____ temperature must be considered for both the dc and ac system conductors.

A)ambient
B)minimum
C)maximum
D)below normal

Question 9

The electrical energy produced by a photovoltaic system can be stored using ____ to supply the building's electrical needs at night or on overcast days.

A)arrays
B)batteries
C)engines
D)water heaters

Question 10

What is the purpose of single-line diagram, and what information should it include?

Question 11

The maximum dc source current is defined by NEC 690.8(A)as the sum of parallel module rated short circuit currents multiplied by ____ percent.

A)110
B)125
C)150
D)200

Question 12

Photovoltaic modules in an array produce ____ electricity when exposed to sunlight.

A)direct current
B)alternating current
C)solar
D)electrostatic

Question 13

The NEC requires all utility interactive inverters to be listed to UL 1741 . Please explain the two key requirements of the standard.

Question 14

Describe the requirement for a grounding electrode system for a utility interactive photovoltaic installation.

Question 15

What has the 2011 NEC required for arc-fault protection, and what are its three functions?

Question 16

Grounded conductors, whether dc or ac, must be identified with white or ____ insulation in accordance with NEC 200.6.

A)orange
B)gray
C)green
D)black

Question 17

The installation of utility interactive solar photovoltaic systems has accelerated in recent years due to energy conservation and ____ concerns.

A)environmental
B)electrical
C)solar
D)semiconductor

Question 18

The plans for commercial PV projects usually have to be submitted to the ____ for review and comment prior to issuance of a permit.

A)AHJ
B)CFP
C)PVJ
D)BHO

Question 19

If additional grounding electrodes are used, they are connected directly to ____.

A)the array frame or structure
B)a spliced conductor
C)the batteries
D)the utility connection

Question 20

The most common material used today for production of photovoltaic cells is ____.

A)crystalline silicon
B)magnesium phosphate
C)platinum
D)potassium chloride