Licensed Electrical Contractor NEC General Requirements 3

Question 1

Per NEC 110.26(A)(1), what is the minimum clear working space depth in front of equipment operating at 151–600V to ground with exposed live parts on one side and a grounded surface on the other (Condition 2)?

Accepted Answer

3.5 feet

Answer

3 feet

Answer

4 feet

Answer

4.5 feet

Question 2

What does NEC 110.22 require to be legibly marked on disconnecting means?

Accepted Answer

The load served and the source of supply

Answer

The installer's name and license number

Answer

The ampere rating and voltage rating only

Answer

The date of installation and inspection

Question 3

According to NEC 110.12, electrical equipment must be installed in a:

Accepted Answer

Neat and workmanlike manner

Answer

Listed enclosure only

Answer

Location accessible only to qualified persons

Answer

Dry location unless weatherproof rated

Question 4

Under NEC 110.14(C)(1), the temperature rating of a conductor connected to a 60°C-rated terminal on a device rated 100A or less must be based on:

Accepted Answer

60°C ampacity tables

Answer

75°C ampacity tables

Answer

90°C ampacity tables

Answer

The highest rated insulation available

Question 5

What is the NEC definition of a 'qualified person'?

Accepted Answer

One who has skills and knowledge related to the construction and operation of electrical equipment and installations

Answer

A licensed electrician with 5+ years of experience

Answer

Any person with an electrical contractor license

Answer

A journeyman electrician approved by the AHJ

Question 6

NEC 110.10 requires that the components of a circuit be selected so that the circuit's impedance characteristics allow the overcurrent device to:

Accepted Answer

Clear fault current without extensive damage to components

Answer

Trip within 3 cycles under any condition

Answer

Limit fault current to 10,000A maximum

Answer

Coordinate with downstream devices at all times

Question 7

Per NEC 110.26(D), when is dedicated electrical space required above panelboards and switchboards?

Accepted Answer

For the width and depth of the equipment from the floor to a height of 6 feet above or to the structural ceiling, whichever is lower

Answer

Only in commercial occupancies

Answer

For all equipment rated over 1200A

Answer

Only when equipment is located outdoors