Test Your Code IQ — November 2024

Courtesy of www.MikeHolt.com.

All questions and answers are based on the 2023 NEC.

Q1: Fire alarm circuit cables and conductors installed exposed on the surface of ceilings and sidewalls shall be supported by _____, hangers, or similar fittings designed and installed so as not to damage the cable.

a) straps

b) staples

c) cable ties

d) any of these

Q2: Article _____ covers the general requirements for the installation of single- and multiple-conductor cables used in Class 2 and Class 3 power-limited circuits, power-limited fire alarm (PLFA) circuits, and Class 4 fault-managed power circuits, and optical fiber installations.

a) 722

b) 723

c) 724

d) 725

Q3: Enclosures for switches or overcurrent devices are allowed to have conductors feeding through where the wiring space at any cross-section is not filled to more than _____ of the cross-sectional area of the space.

a) 20%

b) 30%

c) 40%

d) 50%

Q4: For Class I locations where Sec. 501.140(A)(5) is applied, flexible cords shall be _____ from the power source to the temporary portable assembly and from the temporary portable assembly to the utilization equipment.

a) permitted to be spliced

b) of continuous length

c) installed in a metal raceway

d) spliced only using listed splicing kits

Q5: For FMC, _____ shall be installed where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation.

a) an equipment grounding conductor

b) an expansion fitting

c) flexible nonmetallic connectors

d) adjustable supports

Q6: The grounding electrode conductor connection shall be made at any accessible point from the load end of the overhead service conductors, _____ to the terminal or bus to which the grounded service conductor is connected at the service disconnecting means.

a) service drop

b) underground service conductors

c) service lateral

d) any of these

Answers:

Q1: d) any of these

According to Sec. 760.24(A), "Such cables shall be supported by hardware, including straps, staples, hangers, listed cable ties identified for securement and support, or similar fittings designed and installed so as not to damage the cable."

Q2: a) 722

Section 722.1 states, "This article covers the general requirements for the installation of single- and multiple-conductor cables used in Class 2 and Class 3 power-limited circuits, power-limited fire alarm (PLFA) circuits, and Class 4 fault-managed power circuits, and optical fiber installations."

Q3: c) 40%

Per Sec. 312.8(A)(1): "The total of all conductors installed at any cross-section of the wiring space does not exceed 40% of the cross-sectional area of that space."

Q4: b) of continuous length

Section 501.140(B)(5) requires flexible cords to be of continuous length where Sec. 501.140(A)(5) is applied.

Q5: a) an equipment grounding conductor

Per Sec. 348.60(B): "An equipment grounding conductor shall be installed where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation."

Q6: d) any of these

Section 250.24(A)(1) specifies, "The grounding electrode conductor connection shall be made at any accessible point from the load end of the overhead service conductors, service drops, underground service conductors, or service lateral to the terminal or bus to which the grounded service conductor is connected at the service disconnecting means."

These materials are provided by Mike Holt Enterprises in Leesburg, Fla. To view Code training materials offered by this company, visit www.mikeholt.com/code.