Applied Codeology - NEC - Article 90 and Article 110

The NEC covers the installation of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment , and raceways; and optical fiber cables and raceways for all of the following EXCEPT:

• Floating Buildings

• Underground Mines

• Carnivals

• Private Premises

For specific items of equipment and materials referred to in the NEC, examinations for safety made under standard conditions shall be performed by whom?

• Authority Having Jurisdiction

• Contractor

• Qualified Electrical Testing Laboratory

• National Aeronautical and Space Administration

All electrical equipment shall be listed and labeled.

• True

• False

Listed and labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.

• True

• False

• Only if required by the AHJ

• Depends on the cost of installation

It is NEVER permissible to intermix conductors of dissimilar metals in a terminal or splicing connector (select all correct answers).

• True

• False

• Only if the device is identified for the purpose and conditions of use.

• Prohibited for exterior installations only.

Unless marked otherwise, termination provisions of equipment for circuits rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, shall be used only for what temperature rating?

• 60 degrees C

• 75 degrees C

• 90 degrees C

• 105 degrees C

While installing a new branch circuit on an existing panel board you notice one of the feeder conductors is marked with orange tape and every other breaker space is open (no circuit breaker is installed). When measuring voltage you get the results pictured. What type of system are you working with?

• 3-phase, 3-wire, ungrounded delta-connected system

• 3-phase, 4-wire, wye-connected system

• 3-phase, 4-wire, delta-connected system

• 1-phase, 3-wire, delta-connected system

What is the minimum width of the required working space in front of a 480/277-volt, 600-ampere panel board?

• The width of the equipment, or 24", whichever is greater.

• The width of the equipment, or 30", whichever is greater.

• The width of the equipment, or 36", whichever is greater.

• The width of the equipment, or 42", whichever is greater.

A Type 4X enclosure is intended for outdoor use ONLY.

• True

• False

• Depends on the climate.

• Only when approved by the AHJ.

Dimension requirements for Manholes can be found in which Part of Article 110?

• I

• II

• III

• IV

• V