Wiring Methods and Materials Flashcards
6 cards from real Electrician practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Wiring Methods and Materials flashcards as text
What is the primary purpose of using liquid-tight flexible metal conduit (LFMC)?
Answer: To allow movement and vibration while maintaining a watertight seal
LFMC is used where flexibility is needed and moisture protection is required, such as connections to HVAC equipment.
What size knockout is required in an electrical box for 3/4-inch conduit?
Answer: 3/4 inch
A 3/4-inch conduit requires a 3/4-inch knockout in the electrical box to maintain proper fitting.
Which conductor insulation type is rated for use in wet locations and direct burial?
Answer: XHHW-2
XHHW-2 insulation is rated for use in wet locations and is suitable for direct burial applications.
What is the maximum percentage of conduit fill allowed for three or more conductors per NEC Chapter 9?
Answer: 40%
When three or more conductors are installed in a conduit, the maximum fill is limited to 40% of the conduit's cross-sectional area.
What type of connector must be used when terminating EMT at an enclosure in a wet location?
Answer: Raintight compression connector
In wet locations, raintight compression connectors are required to maintain the integrity of the watertight seal at enclosure entries.
What is the purpose of a wire nut (twist-on wire connector)?
Answer: To splice two or more conductors together
Wire nuts (twist-on connectors) are used to join two or more conductors together in an approved manner inside a junction box.