SEO Electrical Systems & Wiring 2

Question 1

Which wire gauge is rated for 20-ampere branch circuits in residential wiring per NEC standards?

Accepted Answer

12 AWG

Answer

12 AWG copper wire is the minimum size required for 20-ampere branch circuits under NEC Article 310.

Question 2

What is the purpose of a GFCI outlet in a bathroom electrical circuit?

Accepted Answer

Protect against ground faults that can cause electrocution

Answer

A GFCI (Ground Fault Circuit Interrupter) detects imbalances in current flow and trips within milliseconds to prevent electrocution.

Question 3

In a standard 120V residential circuit, what color is typically used for the neutral wire?

Accepted Answer

White or gray

Answer

NEC requires neutral conductors to be identified by white or gray insulation in standard residential wiring.

Question 4

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

Accepted Answer

The maximum current a conductor can carry without exceeding its temperature rating

Answer

Ampacity is the maximum current a conductor can continuously carry under specified conditions without damage.

Question 5

Which type of circuit breaker protects against both overloads and arc faults?

Accepted Answer

AFCI breaker

Answer

An AFCI (Arc Fault Circuit Interrupter) breaker detects dangerous arc faults caused by damaged or loose wiring that standard breakers cannot sense.

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