Test Your Code IQ — February 2024

Feb. 15, 2024

How much do you know about the National Electrical Code?

All questions and answers are based on the 2023 NEC.

Q1: In other than dwelling units, all 125V through 250V receptacles supplied by single-phase branch circuits rated 150V or less to ground, 50A or less, and all receptacles supplied by three-phase branch circuits rated 150V or less to ground, 100A or less, installed in _____, shall be provided with GFCI protection.

a) laundry areas

b) finished basements

c) attics

d) guest rooms and suites

Q2: The total degrees of bends in a run of FMC _____ between pull points.

a) shall not be made

b) need not be limited (in degrees)

c) shall not exceed 360 degrees

d) shall not exceed 180 degrees

Q3: Metal enclosures and raceways containing _____ conductors shall be connected to the grounded system conductor if the electrical system is grounded.

a) feeder

b) service

c) branch-circuit

d) outside feeder or branch-circuit

Q4: The ampacity of UF cable shall be that of _____ conductors in accordance with Sec. 310.14.

a) 60°C

b) 75°C

c) 90°C

d) 105°C

Q5: A connection used for no other purpose shall be made between the metal box and the equipment grounding conductor(s). The equipment bonding jumper or equipment grounding conductor shall be sized from Table 250.122 based on the largest _____ conductors in the box.

a) overcurrent device protecting circuit

b) ungrounded

c) grounded

d) neutral

Q6: Where PVC, RTRC, or HDPE is used in Class I, Division 1 underground locations, the concrete encasement shall be permitted to be omitted where RMC or IMC conduit is used for the last _____ of the underground run to emergence or to the point of connection to the aboveground raceway.

a) 12 in.

b) 18 in.

c) 24 in.

d) 30 in.

Answers:

Q1: a) laundry areas.

Section 210.8(B)(14) lists "laundry areas" as a location that shall be provided with GFCI protection.

Q2: c) shall not exceed 360 degrees

As stated in Sec. 348.24(B), "The total degrees of bends in a conduit run shall not exceed 360 degrees between pull points."

Q3: b) service

According to Sec. 250.80, "Metal enclosures and raceways for service conductors and equipment shall be connected to the grounded conductor if the electrical system is grounded."

Q4: a) 60°C

Per Sec. 340.80: "The ampacity of Type UF cable shall be that of 60°C conductors in accordance with 310.14."

Q5: a) overcurrent device protecting circuit

Section 250.148(C) states, "A connection used for no other purpose shall be made between the metal box and the equipment grounding conductor(s). The equipment bonding jumper or equipment grounding conductor shall be sized from Table 250.122 based on the largest overcurrent device protecting circuit conductors in the box."

Q6: c) 24 in.

Per Sec. 501.10(A)(1)(2), "RMC or IMC conduit shall be used for the last 24 in. of the underground run to emergence or to the point of connection to the above ground raceway."

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.

About the Author

Mike Holt

Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.