NABCEP NEC Article 690 Applications 2

Question 1

Under NEC 690.13, how many disconnecting means are permitted to serve as the PV system disconnecting means when the system has multiple dc circuits?

Accepted Answer

Up to six disconnects grouped in one location

Answer

One single disconnect for all circuits combined

Answer

A separate disconnect for each ungrounded conductor of each dc circuit

Answer

No limit as long as each is labeled

Question 2

NEC Article 690 requires rapid shutdown of PV systems on buildings. What is the maximum voltage PV conductors inside the array boundary must be reduced to within 30 seconds of initiating shutdown?

Accepted Answer

30 V

Answer

0 V

Answer

80 V

Answer

120 V

Question 3

For a roof-mounted PV system, what is the boundary of the rapid shutdown zone as defined in NEC 690.12?

Accepted Answer

3 ft from the array in all directions and 1 ft above the roof

Answer

1 ft from the array edges

Answer

The perimeter of the roof only

Answer

5 ft from the building walls

Question 4

According to NEC 690.31(A), PV source and output circuits inside a building must be contained in which of the following?

Accepted Answer

Any listed wiring method suitable for the location

Answer

Metal conduit only

Answer

PVC conduit only

Answer

Type SE cable only

Question 5

What does NEC 690.13(B) require regarding the location of the PV system disconnecting means?

Accepted Answer

It must be at a readily accessible location

Answer

It must be located at the utility meter

Answer

It must be inside a locked electrical room

Answer

It must be within 18 inches of the inverter

Question 6

NEC 690.56(C) requires a plaque or directory at the service entrance of a building with a PV system. What information must it convey?

Accepted Answer

The location of all disconnecting means including PV system disconnects

Answer

The PV array output current only

Answer

The installer's license number

Answer

The system's annual energy production estimate

Question 7

Under NEC 690.15, a disconnecting means must be provided to isolate PV equipment such as inverters and charge controllers. Where must this disconnect be located?

Accepted Answer

Within sight of or integral to the equipment it isolates

Answer

At the utility interconnection point

Answer

At the main service panel only

Answer

At the PV array combiner box