Journeyman Electrician’s Exam Journeyman Electrician's Panelboards and Switchboards 2

Question 1

Per NEC 110.26(F)(1), the dedicated electrical space above a panelboard extends from the top of the equipment to a height of:

Accepted Answer

6 feet above the equipment or to the structural ceiling, whichever is lower

Answer

3 feet above the equipment

Answer

The full height of the room

Answer

18 inches above the top of the enclosure

Question 2

Which NEC article primarily governs the installation of switchboards, switchgear, and panelboards?

Accepted Answer

Article 408

Answer

Article 404

Answer

Article 430

Answer

Article 230

Question 3

Per NEC 408.40, equipment grounding conductors must terminate within a panelboard on:

Accepted Answer

The equipment grounding terminal bar

Answer

The neutral bar at any available lug

Answer

The main bonding jumper only

Answer

Any metal structural component inside the panel

Question 4

When a panelboard serves as service equipment, the neutral conductor must be bonded to the equipment grounding terminal bar via:

Accepted Answer

A main bonding jumper

Answer

A system bonding jumper

Answer

A grounding electrode conductor only

Answer

No bond is permitted at service equipment

Question 5

Per NEC 230.70(A), the service disconnecting means for a building must be installed:

Accepted Answer

At a readily accessible location either outside or inside nearest the point of entrance of the service conductors

Answer

In the basement of the structure at the main panelboard

Answer

At the electrical meter socket on the exterior of the building only

Answer

Within 10 feet of the main service panel interior

Question 6

What is the maximum number of disconnects permitted for a single service per NEC 230.71?

Accepted Answer

Six disconnects

Answer

Three disconnects

Answer

Four disconnects

Answer

No limit as long as each disconnect is labeled

Question 7

A switchboard differs from a panelboard primarily in that switchboards are:

Accepted Answer

Large single or multi-section assemblies accessible from the front and often the rear

Answer

Smaller enclosures designed to be flush-mounted in walls

Answer

Limited to 42 overcurrent devices

Answer

Required to have a single main disconnect only