ICC Electrical Systems and Safety 3

Question 1

What is the minimum wire gauge required for a 20-ampere branch circuit in a residential installation?

Accepted Answer

12 AWG

Answer

12 AWG copper wire is the minimum size required for 20-ampere branch circuits to prevent overheating.

Question 2

In Illinois, electrical inspections for new residential construction are performed by:

Accepted Answer

The local authority having jurisdiction (AHJ)

Answer

The Authority Having Jurisdiction (AHJ), typically the local building department, performs mandatory electrical inspections.

Question 3

What is the maximum length of a flexible cord used as a substitute for permanent wiring under Illinois electrical code?

Accepted Answer

Flexible cords may never substitute for permanent wiring

Answer

The NEC, adopted in Illinois, prohibits the use of flexible cords as a substitute for permanent fixed wiring.

Question 4

Which of the following is a lockout/tagout (LOTO) requirement when performing electrical maintenance in Illinois?

Accepted Answer

Isolate and de-energize all energy sources before beginning work

Answer

Lockout/Tagout procedures require that all energy sources be isolated and locked out before any maintenance work begins.

Question 5

What is the required height for service entrance conductors over a public sidewalk in Illinois?

Accepted Answer

10 feet

Answer

Service entrance conductors must maintain a minimum height of 10 feet over pedestrian areas such as public sidewalks.

ICC - Illinois Commerce Commission Certified Contractor Practice Test