Question 1

When would an installer use Informative Annex C?

Accepted Answer

Informative Annex C is used if the conductors being installed are all of the same wire size and have the same insulation type.

Question 2

There are two types of overcurrent devices used in PV systems: ____________________ and circuit breakers

Accepted Answer

fuses

Question 3

Type NM, Type UF, Type AC, Type MC, and Type USE are all ____________________ types.

Accepted Answer

cable

Question 4

Describe the two exceptions in NEC Section 690.13 that deal with disconnecting grounded connectors.

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Question 5

____________________ is the current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

Accepted Answer

The answer of ____________________ is the current, in amperes, that...

Question 6

Every circuit must be protected from an electrical current that exceeds the conductor's voltage.

Accepted Answer

A circuit must be protected from an electrical current that exceeds the conductor's capacity (ampacity), not voltage. Protection is typically against overcurrent to prevent overheating and potential fire hazards.

Question 7

Conductor ampacity must be derated for high ambient temperatures when the ambient temperature around the conductor is higher than the base temperature rating of 30° C (86° F).

Accepted Answer

Conductor ampacity decreases as the temperature around the conductor increases. Thus, it must be derated for high ambient temperatures above the base temperature rating of 30° C (86° F).

Question 8

Write the common formula used to calculate voltage drop.

Accepted Answer

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Question 9

Why is there a need to consider voltage drop when installing long runs of wiring as part of a PV system?

Accepted Answer

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Question 10

There are two types of grounding in a PV system: ____________________ grounding and equipment grounding.

Accepted Answer

The answer of There are two types of grounding in...

Question 11

What is typically used to house source circuit OCPDs in a roof-mount PV array and where is it located?

Accepted Answer

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Question 12

If conductors are installed in conduit located outside of a building or underground in a trench, you need to use 90° C, wet rated conductors.

Accepted Answer

Conductors installed outside or underground are more susceptible to moisture and heat, so 90°C wet rated conductors are required for safety reasons.

Question 13

A grounded conductor is a system or circuit conductor that is intentionally grounded.

Accepted Answer

A grounded conductor is intentionally connected to earth or to a conductive body that serves in place of the earth. It is usually recognized by its white or gray color insulation.

Question 14

What two criteria must an installer consider with conductor sizing for a PV system?

Accepted Answer

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Question 15

A junction box typically located at the PV array location where two or more PV source circuits are connected together is called a(n) ____________________ box.

Accepted Answer

The answer of A junction box typically located at the...

Question 16

What type of wire is recommended for use when wiring PV systems?

Accepted Answer

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Question 17

Why is conductor insulation color coded in a PV system?

Accepted Answer

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Question 18

The conductors between the inverter and the batteries in a stand-alone system, or the conductors between the inverter and the photovoltaic output circuit in a grid-tie system, are referred to as the inverter output circuit.

Accepted Answer

The conductors between the inverter and the batteries in a stand-alone system, or the conductors between the inverter and the grid in a grid-tie system, are referred to as the inverter output circuit. The description provided mixes the input and output sides of the system.

Question 19

PV system installers must install the correct type of ____________________ for a PV system to be National Electrical Code compliant.

Accepted Answer

The answer of PV system installers must install the correct...

Quiz 9: Pv System Wiring and the Nec