ICC Electrical Systems and Safety

Question 1

Which electrical code serves as the primary reference for wiring installations in Illinois?

Accepted Answer

National Electrical Code (NEC)

Answer

The National Electrical Code (NEC) is the standard reference adopted in Illinois for all electrical wiring and installation work.

Question 2

What is the required minimum clearance between overhead electrical lines and residential rooftops in Illinois?

Accepted Answer

8 feet

Answer

The NEC and Illinois requirements mandate at least 8 feet of vertical clearance above rooftops for service-entrance conductors.

Question 3

Which device is required in all new residential bathrooms to protect against electrical shock from ground faults?

Accepted Answer

Ground Fault Circuit Interrupter (GFCI)

Answer

GFCI outlets or breakers are required in bathrooms, kitchens, and other wet locations to prevent potentially fatal electrical shocks.

Question 4

When working near energized electrical equipment, Illinois contractors must follow which safety standard?

Accepted Answer

OSHA 29 CFR 1910.333 (Electrical Safety)

Answer

OSHA 29 CFR 1910.333 establishes safety-related work practices that apply when working on or near energized electrical equipment.

Question 5

What color is the grounding conductor in a standard U.S. electrical system?

Accepted Answer

Green or bare copper

Answer

Grounding conductors are identified by green insulation or left as bare copper wire to distinguish them from current-carrying conductors.

ICC - Illinois Commerce Commission Certified Contractor Practice Test