CEI Electrical System Components 2

Question 1

What is the maximum voltage rating for a standard residential duplex receptacle installed in the US?

Accepted Answer

120V

Answer

Standard residential duplex receptacles are rated for 120V use in the US.

Question 2

Which component in a panelboard provides overcurrent protection for individual branch circuits?

Accepted Answer

Circuit breakers

Answer

Circuit breakers in a panelboard provide overcurrent protection by tripping when current exceeds rated capacity.

Question 3

A Type SE (service entrance) cable is primarily used for what application?

Accepted Answer

Connecting service equipment to the utility

Answer

Type SE cable is designed for use as a service entrance conductor connecting service equipment to the utility supply.

Question 4

What does the term 'ampacity' refer to in electrical systems?

Accepted Answer

The current-carrying capacity of a conductor

Answer

Ampacity is the maximum current a conductor can carry continuously without exceeding its temperature rating.

Question 5

Which type of conduit is NOT suitable for direct burial without additional protection?

Accepted Answer

Electrical metallic tubing (EMT)

Answer

EMT is not listed for direct burial because its thin walls provide insufficient protection against soil corrosion and physical damage.

(CEI) Certified Electrical Inspector Practice Test