Electrical System Components Flashcards
7 cards from real CEI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical System Components flashcards as text
Which insulation type is rated for use in wet locations and has a 90°C temperature rating?
Answer: Type THWN-2
Type THWN-2 is rated for wet locations with a 90°C temperature rating, making it suitable for conduit in damp or wet environments.
A transformer's kVA rating represents which of the following?
Answer: Its apparent power capacity
kVA (kilovolt-amperes) represents the apparent power rating of a transformer, which is the product of voltage and current without regard to power factor.
What component is used to connect a grounding electrode system to the service equipment?
Answer: Grounding electrode conductor (GEC)
The grounding electrode conductor (GEC) connects the grounding electrode system (such as a ground rod) to the service equipment.
Which type of switch is used to control a single light fixture from two different locations?
Answer: Three-way switch
Three-way switches are used in pairs to control a single load from two separate locations, such as both ends of a staircase.
What is the minimum cover requirement for direct-buried Schedule 80 PVC conduit under a residential driveway?
Answer: 12 inches
NEC Table 300.5 requires a minimum 12-inch cover for Schedule 80 PVC conduit under a residential driveway.
A GFCI device is designed to trip when a ground fault current reaches approximately what level?
Answer: 5 milliamps
GFCI devices are designed to trip at approximately 4-6 milliamps (nominally 5 mA) to protect against electrocution.
When installing a meter socket, the service conductors entering from the utility are referred to as:
Answer: Service-entrance conductors
The conductors from the utility connection point to the service disconnect are classified as service-entrance conductors.