Wiring Methods & Materials Flashcards

What is the minimum burial depth for Type UF cable supplying a 120V outdoor receptacle not exceeding 20A?

Answer: 12 inches

NEC Table 300.5 requires Type UF cable to be buried at least 12 inches deep for 120V circuits rated 20A or less.

Which wiring method is permitted in a Class I, Division 1 hazardous location?

Answer: Threaded rigid metal conduit (RMC)

NEC 501.10(A) requires threaded rigid metal conduit (RMC) or threaded steel intermediate metal conduit (IMC) in Class I, Division 1 locations.

When installing EMT, what is the maximum distance from a box or fitting that a support must be placed?

Answer: 3 feet

NEC 358.30(A) requires EMT to be secured within 3 feet of every outlet box, junction box, cabinet, or fitting.

What color is the equipment grounding conductor insulation typically required to be?

Answer: Green or bare

NEC 250.119 requires equipment grounding conductors to be identified by green insulation, green with one or more yellow stripes, or bare copper.

What is the maximum number of quarter bends (360 degrees total) permitted in a single run of conduit between pull points?

Answer: 360 degrees total

NEC 358.26 (for EMT) and similar sections for other conduit types limit bends to 360 degrees total between pull points.

Which of the following is NOT an acceptable use of flexible metal conduit (FMC)?

Answer: In wet locations

NEC 348.12(2) prohibits FMC in wet locations unless a corrosion-resistant FMC listed for the purpose is used.

For conductors installed in conduit, what is the fill percentage limit when there are three or more conductors?

Answer: 31%

NEC Chapter 9, Table 1 limits conduit fill to 40% for two conductors and 31% for three or more conductors.