Deck 9: Pv System Wiring and the Nec

Question 1

When would an installer use Informative Annex C?

Answer 1

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

Answer 2

fuses

Question 3

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

Answer 3

cable

Question 4

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

Question 5

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

Question 6

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

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).

Question 8

Write the common formula used to calculate voltage drop.

Question 9

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

Question 10

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

Question 11

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

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.

Question 13

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

Question 14

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

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.

Question 16

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

Question 17

Why is conductor insulation color coded in a PV system?

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.

Question 19

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