Licensed Electrical Contractor Electrical System Design & Installation 2

Question 1

When sizing conductors for a continuous load, the conductor ampacity must be at least what percentage of the load's ampere rating per NEC 210.19?

Accepted Answer

125%

Answer

100%

Answer

115%

Answer

80%

Question 2

Which conductor material requires anti-oxidant compound when terminating at devices or equipment?

Accepted Answer

Aluminum

Answer

Copper

Answer

Copper-clad aluminum

Answer

Tinned copper

Question 3

A 240V single-phase motor draws 28 amperes at full load. The minimum branch circuit conductor size using 75°C copper wire (THWN) is:

Accepted Answer

8 AWG

Answer

10 AWG

Answer

6 AWG

Answer

12 AWG

Question 4

Which NEC article governs the installation of electrical systems in hazardous (classified) locations?

Accepted Answer

Article 500

Answer

Article 410

Answer

Article 600

Answer

Article 700

Question 5

In a delta-wye transformer installation, which winding configuration provides a neutral conductor on the secondary side?

Accepted Answer

Delta primary, wye secondary

Answer

Delta primary, delta secondary

Answer

Wye primary, delta secondary

Answer

Wye primary, wye secondary

Question 6

What is the maximum distance a disconnecting means can be located from the point of entrance for a service in a building?

Accepted Answer

The first point of entrance to the building

Answer

10 feet

Answer

At the nearest accessible location

Answer

No more than 20 feet inside the building

Question 7

For a 3-phase, 4-wire wye system rated 208Y/120V, what is the voltage measured between any phase conductor and the neutral?

Accepted Answer

120V

Answer

208V

Answer

240V

Answer

277V